GEORGIA S'rATE DIVISION OF CONSERVATION DEPARTMENT OF MINES, MINING AND GEOLOGY GARLAND PEYTON, Director THE GEOLOGICAL SURVEY Bulletin Number 74 V,/; LOGS OF SELECTED WELLS IN THE COASTAL PLAINS OF GEORGIA by Esther R. and Paul L. Applin ATLANTA 1964 LETTER OF TRANSMITTAL Department of Mines, Mining and Geology May 4, 1964 His Excellency, Carl E. Sanders Governor of Georgia and Commissioner Ex-Officio State Division of Conservation Atlanta, Georgia Dear Governor Sanders: I have the honor to submit herewith Georgia Geological Survey Bulletin No. 74, "Logs of Selected Wells in the Coastal Plain of Georgia" by Esther R. and Paul L. Applin, formerly Geologists of the United States Geological Survey. This report contains valuable data upon the geology and water-bearing forma- tions beneath the Coastal Plain of Georgia. These studies of cuttings and cores I; of 31 selected wells will be of much use in supplying ground-water information '.i needed by cities, industries, well drillers, mine plants and farmers. The geologic information will be used by geologists who are engaged in the search for oil and gas in Georgia. I believe that the publication of this report is another of the valuable contributions to the search for water and oil that we have been privileged to make. Very respectfully yours, 11 I: Garland Peyton Director , iii CONTENTS Page Introduction ---------------- -------------- --------------- v Well Logs ____ -------------------- --------------~-- 1 Aikinson County _____ --------------------------- -------------- --------------------- --------------------------- 1 GGS 107 ----------------- ------------------------ -----------------~------------ ----------~------------------- 1 Bacon County ----------------------- ---------------- 28 GGS 58 ____ -------------------- -------------------- 2M Brooks County ------------- --------------GGS 184 32 ------------------~--- 32 Calhoun County ____ -------------------- ------------------------- 37 GGS 192 ------------------ ------------------ _______________ ----------------~------------- 37 Camden County ---------------------------------- ------------------- -------------------------- 44 GGS 54 ------------------------- ______________ ----~----~----- --------------------------- 44 GGS 153 --~------------------- --------------------------- --------------~---- 45 . Charlton County --------------- ------~---~ 46 GGS 185 ____ --------------- ----------------------------- --------------~- ---------------~--~--------- 46 Clinch County ---------------------------------------- --------------- ------------------------------ 49 GGS 144 ---------- ------------------------------------------------ ________________ --~----------- 49 GGS 338 __ ----------------- ----------~- GGS 481. -----------------------------------~--- GGS 496 ------~--- ---~---------- -------------~---------- -------~------------- 65 ----------~-~------------- ---------------------- 69 -------~--~------~-------- 73 Coffee County ---------------------- ------------------------ ------------------------------------------ 86 GGS 468, 509 & 508 ________________ _____________ -----------~---------------~~-----~-- 86 Colquitt County_______ --------------------------- ------------------------- -------------------- 112 GGS 170 ----------------- ------------------------------~-------------~------- -----------------~-------~---~-- 112 J;>ec:atur County _____ ------------------------- ------------------------ ------------------------- 120 GGS 55 ___ ---------------~-----------~- --~---------~---~---- ----------------- ------------------ 120 GGS 57 --------------------~----'--~--------~ ____________ ----------~-- ----------------------- 123 GGS 168 ______________, -----~----------------~-- ---------------~---------~ --------------------- 127 GGS 191 ---~-------- ---------------------- --------------------- ------------~---------~-- 132 Early County ------------------------ ------------------------ ----------------------- ------------------------ 186 GGS 121 :-------~--------------------------- --------------~ ---------~--------- ----~--------~--- 136 Echols County ____________ -------------------- -------------------------------- --------------- 148 GGS 150 ----~----------------- -------------~----~-------- ---------------~-------~----- 148 GGS 158 _--------------~------------- ----------~-GGS 169 -------------------~----~--------- ------------------~ ------------~------------ 156 ---------------------~---------~----- 166 GGS 189 ------------------ ______________ ---------------------------------- 171 Lowndes County ______c_______ ------------------ ------------------------------------------ ---------~-- 183 GGS. 182 ____ --------------------------- -------------------- --------------------------~ 183 Mitchell County ____ ---------------- -----------~-----~ ----------- 186 GGS 109 _ Seminole County --------~------ ------------------------ ------~-------~--~ 186 -------------~ ------------ 201 GGS 187 -------------------- --------------------------- ------------------ -- 201 GGS 204. ____ ------------- ---------~--------------------~------------ 204 Thomas County ------- ---------------- --------------- ______ 208 GGS 19 ---------------- --------------------- ------------~--------------------------- --------------------- 208 GGS 56 ------------------------------------------------------ ------------------------------ ___________ 212 GGS 59 ----------------"------ ----------------- ____________ ------------------~ 216 Wayne County ------------- -------------------------- ----------------------------- 220 GGS 52 ____________________ ------------------ --------------- -------------------------~------~--- _______ 220 ' ' i' LOGS OF SELECTED WELLS IN THE COASTAL PLAIN OF GEORGIA By Esther R. Applin Introduction This report contains lithologic and paleontologic descriptions of cuttings and cores from 31 selected wells in the Coastal Plain of Georgia. These descriptive logs are based on microscopic studies made periodically from 1937 to 1962. Prior to my employment with the U.S. Geological Survey, the studies were on a commercial basis, but thereafter they were part of the regional investigations of the U.S. Geological Survey relating to stratigraphy and structure of Mesozoic rocks in the subsurface of the southeastern Gulf and Atlantic Coastal Plain. The logs of 21 oil tests deal chiefly with Cretaceous and older sedimentary rocks, and only incidentally with overlying Tertiary rocks; the other logs describe the Eocene and younger rocks penetrated in relatively shallow water wells. Microscopic study of the samples of the Cretaceous rocks provided a part of the basic data for reports by PaulL, Applin and Esther R. Applin that have been published by the U.S. Geological Survey. After retirement from the Federal Survey, I was requested by the Director of the Georgia Geological Survey to prepare logs of significent wells for publication. The original descriptions of the cuttings and cores from the wells were, in many instances, abbreviated notes, and the work of putting them into readable form fell 'to my husband, Paul L. Applin: v ,,' .' ... ~'" t" ,,01 ~ ~'" s- ~ ~. ~ s 's~" '2"' ~ ~. ~ ~ a~ 6" ~. 1101 ~ it ~ ~ %" ,,' ... -:.'1 UO ". + :0 do + ~. '" sa . .. ~ \, LOGS OF SELEC:;1'~ WELLS IN THE COASTAL PLAIN OF GEORGIA 1 ATKINSON COUNTY Operator': Sun Oil Company Landowne,r: Doster-Ladson Well 1 Location: Land District 7, Land Lot 71 1650 ft. north and 660 ft. east of ,southwest 'corner of Land Lot 71. GGS. No. 107 Elevation: 222 ft. (derrick floor) Total depth: 4296 ft. Completed: Jan. 30, 1945 Summary of Stratigraphy Depth Thickness (feet) ( fe e t ) Tertiary Miocene undifferentiated 90 180 Oligocene (1st sample) . 170 upper, Suwannee Limestone __'_:________________________________ 270 middle and lower, Vicksburg Group ~ 390 _c_ .. ., . Eocene ~ , ..,.. - -~- - -- ------ -- --"'- 120 50 1340 upper, Ocala Limestone, upper member 440 130 lower member_________________ 570 210 middle, upper middle, Tallahassee Limestone ( 1)___ 780 90 .., .upper middle (?) or lower middle (?) 870 . 90 lower middle, Lake City Limestone__ _________ 960 500 lower, beds of Wilcox 'age . 1460 320 . " Paleocene .:. ~ 0________ 24 Clayton Limestone ~ 1780 24 Cretaceous Gulf Beds of Navarro age---~---__~C"------------------------------- 1804 Beds of Taylor age " ~------------------- 2447 Beds of Austin age ., . .: 2798 Atkinson Formation, upper member :...__ 3135 ~ , lower member ~ ~__ 3723 Comanche undifferentiated 3870 2066 643 351 337 588 147 350 Pre-Cretaceous Igneous rocks ., .. Lithologic and paleontologic description of cores and cuttings. Samples are cuttings unless otherwise stated. to '4220 total 76 . . depth _J .' 2 -" " ,, - GEORGIA GEOLOGICAL SURVEY BULLETIN 74 Depth (feet) 0- 90 90- 100 ' 100- 270 Description No samples Tertiary Miocene Series undifferentiated Sandstone, quartz; composed of moderately fine to coarse, rounded grains; contains nodules of white sandy clay. ,. . Samples of the Miocene rocks were not studied in detail, but consist , mainly, of sa ndst ones and sandy limestones containing phosphatic material. Oligocene Series Upper Oligocene. Suwannee Limestone. 270- 280 280- 290 ,290- 300 300- 310 310- 380 380- 390 Chalk, white, non-sandy. Lim estone, white, m oderately hard, porous; composed mainly, of masses of poorly preserved molds of microfossils, including speci mens of Cosk in olina [loridoma: Limestone, like sample at . 280-290 ft., but more dense; sp ecim ens of Coskinolina fl oridana common. Like sample at 290-300 ft ; contains specimens of Quinqueloculina letm ensis. , - Limestone, white, chalky, calcitic, microfossiliferous, irregularly porous; contains many specim ens of Coskinolina floridana: and _ other species of Foraminifera common in the Suwannee lim es ton e. Limestone, cr eam ; compo sed of roll ed, us ually well-rounded mold s of microfossils and f ragments of f ossiliferous limestone; Cos- i , , kin olin a fl oridana comm on. 390- 400 400-41 0 410- 420 420- 430 430- 440 Middle and Lower Oligocene. Vick sburg Group. Limestone, cream and white, hard, nodular, irregularly porous ; contains abundant traces of poorly preserved mi crofossil s and fragments of molds of macrofossils. Many calcitized fragments 'of echinoids are present. Sample contains numerous fragm ents of white chert. Like sample at 390-400 f eet. Sample contains molds of Op erculi- n oides, sp. Like s~mple at 400-410 ft., bu t f ossil material is better preserved. Species of Foraminifera identified are: worn specimens Op erculinoides sp. , L epid ocy clina mantelli, and Gypsina globula. Speci m ens of Coskinolina flo ridana are present, but are possibly not indigenous . Like sample at 410-420 ft; contains poorly preserved specimens of other species of L epidocyclina common to the Vicksburg of this area .- No sample $! LOGS OF SELECTED WELLS IN THE COASTAL PLAIN OF GEORGIA 3 Depth (feet) 440- 470 470- 570 Description Eocene Series Upper Eocene. Ocala Limestone. Upper Member. Lithology and fauna of three 10-foot samples are, in general, like sample at 420-430 ft. but show the introduction of fragments of a more chalky, highly fossiliferous limestone, and worn speci- mens of Operculinaides [loridana and Astcrocyclina georgianaj at 460-470 ft. specimens of Ps eudophrturmina citrensis are pres- ent. Coquina, light-cream; composed of worn and fragmentary molds of microfossils, mainly Operculinoides ocalanns, several varieties of Lepidoc;yclil1a ocalana, Asterocyclina ge01'giana, and other Ocala species. Highest occurrence of H eteroeteqina ocalana is in the sample at 510-520 ft. . Upper Eocene. Ocala Limestone. Lower Member. 570- 580 " . Lithology and fauna ' are, in general, like the samples at 470-570 ft, but this sample contains specimens of Amphistegina pi1mrensii cosdeni, marking the top of the lower member of the Ocala Limestone. 580- 600 Limestone, cream, dolomitic, cryptocrystalline. No identifiable indigenous fossils were observed, although ' traces of fossil molds occur in the limestone; the sample contains fossils that are evidently caving from higher levels. . 600- 660 Samples in this interval are, in general, about 50 percent cream, porous, pitted, cryptocrystalline to very finely granular limestone, and 50 percent fine to moderately coarse grained quartz sand which may be caving. 660- 670 Limestone, white and light-cream, unfossiliferous, in part chalky and in part dolomitic; about 25 percent of the sample is composed of fine to ~oarse, rounded grains of quartz sand. 670- 720 Samples in this interval are like the sample at 660-670 ft., but contain seemingly indigenous specimens of L epidocuolina sp., and chalky ' specimens of Amphistegina pinarensis cosd eni. 722- 729 Core 1. Recovery 3 ft. Limestone, white to cream, porous, irregularly chalky, and finely dolomitic; contains many sections of small miliolids and traces of impressions of other microfossils. , 720- 780 Samples in this interval are composed of limestone like the core at 722-729 ft. and contain specimens of Amphistegina pina1'ensis cosdeni and poorly preserved specimens of L epidocyclina sp. 780- 810 Middle Eocene. Upper Middle Eocene. Tallahassee Limestone (?) equivalent. Samples in this interval are composed of limestone like the samples at 720-780 ft. and contain, in addition, fragments of white, 4 Depth (feet) 810- 820 820- 830 830-840 840- 850 I 843- 858 850- 870 GEORGIA GEOWGICAL S ,URVEY BULLETIN 74 Description gray-spotted chalky lim estone composed mainly of masses of chalky molds of Foraminifera and fragm ents of molds of macro- fo ssils. Fragments and poorly preserved molds of at least two sp ecies of L epidocyclina, worn molds of specim ens of Operculi- noides, sp., and specime ns of A rnphistegina pinarensis cosdeni are present in the gray-spotted limestone. . Limeston e, white, g r ay-spotted 'f ossilif er ous, like samples at 780- 810 f t., but t he fo ssil material consists of worn 'and rolled molds. Fossils present are secti ons of sma ll miliolids, specimens of L epidocyclina cf . L . pI.lstulosa, Operculin oides sp., Valvulina sp., and ,a few specimens of A 1nphistegina pinarensis cosdeni. Limestone, wh ite, gray-spotted, porous, in part cha lky and in part dolomitic; composed of a mass of worn and fragmental fossil material, in wh ich the fo ssil s are mostly too poorly preserved for identification. However, the fauna seems to be similar to that in the sample at 810-820 ft. Limestone, like the sample at 820-830 ft., but more indurated and .t he fossil material is less well preserved. Limestone, gray-spotted, chalky and dolomitic; contains bryozoan fragments and vague traces of "other fossils. Core 2. Recovery 2 ft. , Limestone, white, gray-spotted, porous; ,co;nposed of a mass of molds of small miliolids and fragments of other microfossils.. Two 10-foot samples composed of material like the core at 843-858 ft. ' 870- 880 880- 890 890- 900 ' 900- 910 910- 930 Middle Eocene. Upper ,Middle ( ? ) , or, Lower Middle( 7) Eocene. Lime stone, chalky, 50 percent of sample; similar to samples at 850-870 ft., but only slightly gray-spotted. Fine to coarse rounded grains of clear quartz sand compose 50 percent of sample. Limestone, cream, in part dolomitic, .high ly fossiliferous; contains sp ecimens of Fab ianina cubensis, Operculin oides, sp ., and several sp ecies of L epidocy clina ; about 25"percent of sample is sand like that ~n sample at 870-880 ft. '' Limestone, white and buff, hi ghly dolomitic, somewhat chalky, 50 percent of sample. The dolomite is finely granular. Sand is ~O percent of the sample. " Limestone, like sample at 890-900 ft., is about 75 percent of sample; sand is 25 percent" of sample. Limestone, buff, finel y granular, dolomi tic ; contains scattered chalky areas and selenite. Fossils present are chalky mold s and fragments of L epid ocyclina sp -" Operculinoides sp. , and algal nodules. ~ -,.4 "- LOGS OF SELECTED WELLS IN THE COASTAL PLAIN OF GEORGIA 5 Depth (feet) 930- 960 Description Dolomite, light-buff, finel~ giari~l~r; ~oritain s small' chalky areas, specimens of two species or" Lep'idoCyeli-i/n,. and irregular-shaped chalky nodules that are probably of algal 'or igin . Middle Eocene. ' Lower Middle Eocene. 960-1000 Lake City Limestone. -" Samples in this interval are similar to those at,930-960 ft., but are somewhat glauconitic and contain large inclusions of selenite. ';' " Sample at 970-980 ft. contains specimens of Discocuclina (Aster.()~ - t : . ',;" , ' J " ey elina) monticellensis and numerous fra,gments of several spe" cies of bryozoa. ' , , , ,' " ' , 1000-1060 Limestone, chalky, somewhat dolomitic; gypsum is , common: glau- "conite is rare. Samples contain specimens of Discoeyclina " . : (Ast~oeyelina) .montieellens is, L epidocyelina sp., and numerous fragments of bryozoa. Sample at 1,020-1030 ft. contains speci- mens of A,mphistegina lopeztrigoi var. ' . ." 1060-1100 1<,; Limestone, buff, irregularly chalky, finely dolomitic, somewhat glauconitic; contains abundant fragments of bryozoa, two species of echinoids, numerous specimens of several species of L epido- ,'" ," . " :1"., cuclino. including numerous specimens of L. (Poiulepidino.} antil' ~eQ;, and a few f,ragments of .pfs()oe.1!clina sp, 1100-1140 " Limestone, white, finely fragmental, slightly glauconitic, fossili- ferous; contains abundant fragments. of bryozoa, many speci- mens of Diseoeyelina (Asteroeyclina) monticellensis and Opercu- , _'! ," linoid es sp, and poorly preserved molds of smaller Foraminifera. .Samples also contains "fragments of .buff, granular crystalline dolomite (which ~ay be .caving ) , and iragmE;nts of light-gray chert. \ " It', Like the samples at ,1100-1140 ft., .but Operclilinoides sp, is the dominant foraminiferal species, and most ~:i the remaining fossil material is very finely fragmental;' specimen's of Discocuelina sp. are also-present, il60-1180 , .,J " . Limestone, white, chalky, slightly glauconitic,' containing very finely fragmented fossil material. Specimens of Operculino GEORGIA GEOLOGICAL SURVEY BULLETIN 74 Description Core 19. Recovery 4 ft. Clay, gray, very highly sandy (very fine grained sand), micaceous, calcareous, somewhat finely carbonaceous. Clay, gray, sandy, micaceous; contains numerous specimens of Foraminifera and ostracodes. The fauna is Navarro in character. Core 20. Recovery 3 ft. Like core 19, at 2407-2417 ft. Like sample at 2410-2420 ft. Core 21. Recovery O. Like sample at 2410-2420 ft. Core 22. Recovery lh ft. No sample. Like sample at 2410-2420 ft. Beds of Taylor age. Core 23. Recovery 10 ft. Marl, light-gray, finely micaceous. Foraminiferal fauna includes specimens of Planulina dumblei, Bolivina cretoea, Planulina spis80CQstata, Bolivinoides deeorata, Dorothia grab ella. Clay, light-gray, soft, sandy, micaceous, calcareous. Foraminiferal fauna is like core 23 at 2447-2457 ft. and contains, in addition, many specimens of Clavnlinoides n, sp, Core 24. Recovery O. Like sample at 2450-2460 ft. Specimens of Doroihia cf, D. stephen- soni are added to the fauna. Core 25. Recovery 4 ft. Clay, light-gray, highly sandy (very fine grained sand), micaceous , glauconitic (fine grains), calcareous. Clay, gray, soft, highly sandy (very fine grained sand), micaceous, calcareous. Fauna like that described in preceding samples from beds of Taylor age. Core 26. Recovery O. Like sample at 2470-2480 ft. Fragments of Inoceramus present. Core 27. Recovery 1 ft. Clay, moderately hard, highly sandy (extremely fine grained sand), micaceous, calcareous. Lithology and fauna like that described in preceding samples from beds of Taylor age, with the addition to the fauna of many specimens of Stensioina am ericana and Planulina dumb lei. Core 28. Recovery 10 ft. Top. Like core 27 at 2787-2797 ft; Inoceramus fragments abundant. Bottom. No change. LOGS OF SELECTED WELLS IN THE COASTAL PLAIN OF GEORGIA 11 D epth (feet ) 2500-2510 2507-2517 2510-2520 2517-2527 2520-2530 2527-25 37 2530-2540 253 7-25 47 2547-2557 2550-2560 2557-25 67 2560-2570 2567-2577 2570-2580 2577-2582 2580-2599 2582-2588 2588-2598 Description Like sample at 2490-2500 ft; contains a few Inoceramus fragments. Core 29. Recovery 10 ft. Top. Clay, gray, highly sandy (extremely fi ne g ra ined sand), micaceous, calcareous, contains small shr eds of ca r bona ceous material: Bottom. No change . Like sample at 2500-2510 ft. Cor e 30. Recovery 10 ft. Sandstone, gray, very fine gr ained, argillaceous, mi caceous, calcareous. Li th ology and fauna like that described in preceding cutting sa m- ples from beds of Taylor a ge; some fragm ents of Inocera mus present. ' Core 31. Recovery 10 ft. Clay, gray, highly sandy (extremely fine grained sand ), micaceous, calcareous. Sandstone, .g r a y, argillaceous, mi caceous, calcareous. Microfauna is the same as in the preceding 100 fe et of samples. Cor e 32. Recovery 5 ft. Top. CIa}', g ray, hi ghly sa ndy (very fin e grained sand ), micaceous , calca r eous. Bott om, no change. Clay, gray, hi ghly sandy (fine-grained sand) mi caceous. Specimens of F oraminifera are much less c0rtmon than in preceding samples of beds o f Taylor age. Core 33. Recovery 10 ft. Like core 32 at 2537-2547 ft. Lik e cut t ing sample a~ 2540-2550 ft. Core 34. Recovery .a ft. Clay, light-gray, sandy (fine-grained sand), mi caceous, cal- cercus. Clay, light-gray, sandy (v ery fine grained sand ) , mi cac eou s, cal- careous. Sample contains a f ew nondlagnost ic sp ecies of F ora- minifera. . Core 35. Recovery O. Like cutting sample a t 2560-2570 ft. Core 36. Recovery 4 ft. Clay, gray, highly sandy (fine-grained sand ), micac eous, calcareous, and sof t , argillaceous, very fine grain~d, mi cac eou s sandstone. Clay, g ray, sandy, micaceous, somewhat f ossiliferous. Core 37. Recovery 6 f t. Like core 36 at 2577-2582 ft. Core 38. Recovery 5 ft. 12 GEORGIA GEOLOGICAL SURVEY B ULLETIN 74 Depth (feet) Description 2590-2600 Top,' clay, gray, highly sandy (very fine grained sand), mica- ceous, calcareous. Bottom. No changes . - . Clay, gray , sandy (very fine-grained sand), micaceous, calcareous. Sample contains a f ew sp ecimens ot Foraminifera like those at higher levels in the beds of Taylor age. "- 2598-2 608 Cor e 29. Recovery 3 ft. Top. Clay, gray, sandy calcareous: Bottom. No change. (very fine-grained sand), micaceous, 2600-2610 Sh al e, gray, soft, fl aky, micaceous ; some fragments of gray sandy, micaceous clay, and light-gray, very fine grained cal careous sandstone. 2608-2 618 Core 40. Recovery 4'-h ft. Like core 39 at 2598-2608 ft. and somewhat carbonaceous. 2610-2620 Like cutting sample at 2600-2610 ft; contains f ew specimens of Foraminifera. 2618-2628 Cor e 41. Recovery 6 ft. , Top. Clay, gray, highly sandy (fine-grained sand), micaceous . Bottom, Shale, gray, thinly-laminated, calcareous. 2620-26 30 Clay, gray, sandy, micaceous, and some fragments of gray, soft, flaky, micaceous shale. 2628-26 38 Core 42. Recovery 10 ft. Top 8 ft. clay, gray, sa ndy (extremely..fine-grained sand), cal, careous; gray micaceous clay; and 't hin lenses of gray mica- ceous shale: The core fr agment studied contains traces of macro- fossils. ' .. Bottom 2 ft. Shale, browni sh- gray, micaceous, containing irregu- lar inclusions of white, chalky, glauconitic, micaceous sandstone. 2630-2640 Cuttings of materials like the bottom of core 42 at 2628-2638 ft. 2638-2648 Core 43. Recovery 7 ft. Shale, dark brownish-gray, micaceous, somewhat carbonaceous, containing irregular streaks of light-gray, argillaceous, mica- ceous, slightly glauconitic, calcareous sandstone. . 2640-2650 Clay, gray, soft, sandy (fine-grained sand), micaceous; contains very few specimens of Foraminifera, and no diagnostic spe cies. 2648-2658 Core 44. Recovery 7 ft. " Clay, dark, ' brownish-gray, sandy (ve'ry fine grained sand), micaceous, somewhat carbonaceous. 2650-2660 Like core 44 at 2648-2658 ft; contains a few, nondiagnostic specimens of Foraminifera. 2658-2668 Core 45. Recovery 9 ft. Clay, gray, highly sandy (fine-grained sand), highly micaceous, containing small shreds of carbonaceous material. 2660-2670 Like core 45 at 2658"266'8 ft.; contains few specimens of : Fora- minifera. r, LOGS OF SELECTED WELLS IN THE COASTAL PLAIN: OF GEORGIA 13, ", '; Depth (fe et) Description' 2668-2678 Core 46. Recovery 6 ft. .' ", l Top. Like core ~5 a,t 2658-266l;l ft. ' , '. , Bottom.. Clay, gray, irregularly.sandy ,(f ine-:g r ained sand), mica- ceous. 2670-2680 Like core 46 at 2668-2678 ft. 2678-2688 .; -- 2680-2690 Core 47. Recovery 2 ft. Clay, dark-gray, shaly, irregularly sandy (fine-grained . sand), , micaceous. ',..: ; Like core 47 at 2678-2688 ft. ., 2688-2698 Core 48. Recov ery 5 ft. Like core 47 at 2678-2688 ft. 2690-2700 ' . 2698-2708 ' Like Core' 48 at 2688-2698 ft. ' Core 49. Recovery 6 it. '('nay, gray, irregularly sandy. (very fine grained sand) , micaceous, 2700-2710 Like core 49 'at 2698-2708 ft. 2708-2716 Core 50. Recovery 3 ft. Like core 49 at 2698-2708 ft. 2710-2720 2'716-2728 r 272Q-2730 Like core 50 at 2708-2716 ft. ~. . : t . Core 51. Recovery 7 ,ft. ' C}ay, dark brownish-gray, shaly, irregularly sandy .grained sand ), micaceous. : Like core 51 at 2716-2728 ft. : . ' _ (very fine 2728-2738 Core 52. Recovery 3 ft. Clay, dark brownish-gray, micaceous,' . 2730~2740 No cutting sample; 2738-2748 2740-2750' Core 53. Recovery 6 ft. Top. Like core 52 at 2728-2738 ''ft. bu.'i irregularly sandy (fine- grained sand}, r, ' >, Bottom. Clay, like, top part, but containing irregular in clusions , of , light-gray, argillaceous: 'm ica ceous; calcareou s, very fine grained sandstone. "! . , .... . . .. " '. ' l i ..... I Like core 53 at 2738-2748 ~t; 'i 27:48-2758 Core, 5,4. Recovery, 5 ft. Like core ,53 at 2738-2748 ft. 2750~2760 ,1 Like cor e 54 at 2748-2758 ft. I! ' 2758-2768 Core 55. ' Recovery 5 ft. ' Clay, -dark brownish-gray, irregularly sandy (fine-grained sand), micaceous. 2760-2770 No cutting sample. 2768-2778 Core 56. Recovery ih ft. , Clay, like c'or e 55 at 2758~2768 ft., containing .Ir reg ula r areas of , , ' li gh t-g r ay" micaceous, highly sandy .(f ine-g r a ined sand) clay. .' ' . .~ . .' . . . .. - #' - - 2770-2780 Like core 56 at 2768-2778 ft. - .; 14 G:P::ORGIA GEOLOGICAL SURVEY BULLETIN 74 Depth (feet) 2778-2788 2780-2790 2788-2798 2790-2800 2798-2803 Description, Core 57. Recovery 5 ft. -' , Shale, dark brownish-gray, occurring in thin lenses; and dark- , gray,. micaceous, sandy (fine-grained sand) clay. Like 'core 57 at 2778-2788 ft. Core 58. Recovery 7 ft. No sample. '" ., c Clay, brownish-gray, containing small flakes of mica; very fine and even-grained, micaceou s, calcareous, somewhat glauconitic sandstone. The sample contains a few moderately large nodules of dark-green glauconite. Sp ecimens of Foraminifera are present, but not abundant, and species are not diagnostic; Globotruncana '[orn icata. com mon ; GloboTotalites conicu8 present. Core 59. Recovery 2 ft. Top foot. Shale, brownish-gray, flaky, containing small flakes of mica and a ' few nodules of dark-green glauconite. Specimens of non-diagnostic species of F'oraminifera are present. ,. t, , . . ",g, Beds of Austin ? age. Bottom foot. Shale, brownish-gray, flaky, micaceous, containing irregular streaks and inclusions of fine-grained,' chalky, highly glauconitic sand. Chalky character of sand due to small fragments of microfossiliferous material and Inoceramus prisms.. 2800-2810 Shale, brownish-gray, flaky, micaceous, and very fine grained, micaceous sandstone containing some small grains of glauconite. 2803-2813 Core 60. Recovery 10 ft. 3d and 4th f eet , Marl, light-gray, chalky; micaceous, containing many small black phosphatic nodules, some fragments of fish . , scal es, and abundant In o,ceramu8 prisms: The chalky character' of the 'ma ter ia l is due to abundance of , comminuted microfossil shells. Specimens of Foraminifera present are : Eouvigerina aC'ldeata, Globor otalites conicu8, Planulina ' t exana, Globotrml.cana spp. (common) , Clavulin oides n. sp.9th and 10th feet. Clay, light-gray, chalky, sandy, micaceous, highly glauconitic; , 2813-2823 Core 61. Recovery 2 ft. 2nd foot. Clay shale, brownish-gray, soft, flaky, micaceous, highly glauconitic; light-speckled appearance is due to abundance t"., of small chalky microfossils, Ino ce1'amu8 prisms, and broken and crushed small fragments of chalky fos sil debr-is. Fauna is like that in core 60 at 2803-2813 feet, and the specimens are usually poorly preserved. 2823-2833 Core 62. Recovery 2 ft. Marl, light-gray, sandy (very 'fine-grained sand), chalky, micaceous, highly glauconitic, highly microfossiliferous. The fossil material is" usually composed of ' finely comminuted debris; Inoceramus prisms abundant; Robulus 'l"otulata common; Cibieides' harperi presen't. . i. - LOGS OF SELECTED WELLS IN THE COASTAL PLAIN OF GEORGIA 15 Depth (feet) 2833-2843 2843-2853 2853-2863 2863-2873 2873-2883 2883-2893 2893-2903 2903~2913 2910-2920 2913-2923 Description Core 63. Recovery 1 ft. ' ,. Like core 62 at 2823-283.3 ft. Core 64. . Recovery 10 ft. No change. Core 65. Recovery 10 ft. ->" 1st to 7th foot like cores 62 (2823-2833 ft.) , 63 (2833-2843 ft.), 64 (2843-2853 ft.). Beds of Austin age (defini te) Gober Tongue ( ?) equ ivalent 8th, 9t h and 10th feet. Marl, buff, sandy (ve r y fine grained sand), somewhat mica ceous, chalky. Contain s a large amount of finely commin ut ed, poorly preserved, mi crofosail debris, and abundant lnaceramus prisms and fragments. Many specimens of Fora- minifera present, including H eter astomella au stiniana, Planu- lina aus tin iana, and Loxostoma clava tum. Core 66. Recov ery 5 ft. 1st foot. .Marl, gray, light-spotted, dense, slight ly micaceous. Speckled appearance is due to abundant microfossiliferous material and fin ely fragmented chalky f ossil d ebris, Sp ecimens of F oramin ifera are usually very ' smale Globia erina, Gumb elina, several sp ecies of Globotruncana, and a sma ll ' A n omalina sp. strongly predominate; numerous' specimens of Globorotaliies wmbilicatu8 are present. 2nd and Srd f eet:"Similar to 1st f oot, but slightly glauconitic. 4th and 5th f eet. Marl, buff, light-spotted, slightly micaceous, highly mi crofossiliferous. Core 67. Recovery 5 f t. Like core 66 at 2863-2873 ft. Core 68. Recovery 6 ft. No change in lithology. Inoc eramus prisms very abundant. Some sp ecimens of V entil ab1'ella aus tiniana and Nonumella austiniana present, but fauna otherwise unchanged. Core 69. ,.Recover y 4 ft. Marl, buff, slightly mi cac eou s, containing abundant spe cimens of Foraminifera; fauna unchanged. Core "70. Recovery 10 ft. 1st, 2nd and 3rd feet. Marl, buff, moderately hard, chalky, highly microfossiliferous. Fauna like core 69 at 2893-2903 ft. 6th, 7th and 8th feet. Marl, light-buff, chalky, glauconitic, highly mi crofossiliferous. 9th and 10th feet. Chalk, cream', slightly micaceous, highly glauconitic, highly mi crofossiliferous; pyrite inclusions common; fauna unchanged. Cuttings cont ain specimens of Kyphopyxa, whi ch may have come from higher levels. Core 71. Recovery 5 ft. Marl, buff, light-speckled, micaceous, highly microfossiliferous. Dominant species of Foraminifera are: Globie erina cretac ea, 16 :./ -; . .. ., GEORGIA GEOLOGICAL SURVEY BULLETIN 74 Depth (feet) Description Gumbelina spp., and a -'small A nonUilina ' sp, characteristic' of the beds of Austinage. Also preserit are specimens of Globotruncana austiniana, Globorotalites wmbilicatus, and Planulina teeana; Globigerinn- and Planuli1l4 are the domin~nt forms. 2923-2933 Core 72. Recovery 8 ft. : Marl, ' grayish-tan, somewhat micaceous, highly microfossiliferous. Fauna like core 71 at 2913-2923 ft. 2933~2943 2943-2953 Core 73. Recovery 2 "ft. Like core 72 at 2923-2933 ft. , Core 74. Recovery 8 ft. . l' Marl, tan-gray, micaceous, slightly carbonaceous, highly micro- fossiliferous. Fauna unchanged. ' 2953-2963 Core 75. Recovery O. 2963-2968 Core 75. Recovery 5 ft. . Shale, brownish-gray, flaky, highly micaceous,' somewhat glau- conitic. Contains fragments of fish scales, green and brown mica, and a few small arenaceous species of. Foraminifera. Other species of Foraminifera are like those in core 71 at 2913-2923 ft. 2968-2976 Core 77. Recovery 5 ft. . Marl, brownish-gray, micaceous, highly fossiliferous; contains abundant fragments and prisms of Inoc ermnu8. The foramini- feral fauna is more representative 't han in core 76, and is Austin . . in character. .. 2976-2986 Core 78. Recovery 4 ft. Shale, brownish-gray, micaceous, microfossiliferous. 2980-2990 Cuttings contains specimens of FrQ?ulicularia unduwsa. 2986-2996 Core 79. Recovery 3 ft. Like cere 78 at 2976-2986 ft. 2996-3005- ; .. \. -:c.. 3005-3015 . i ~ Core 80.. Recovery 8 ft. Top 4 feet. Shale, brownish-gray, highly glauconite, calcareous; mi crofossiliferous. Inoc eramus fragments are abundant. Fora- miniferal fauna is composed, largely, of specimens of Gihnbelina reu8si, Globiq erina. cretacea, Globtruncana. ; canaliculata, and many specimens of Globorotalites umbilicatuB and Planulina sp. (small forms). ' . .. . .Bot t om 4 ft. shale; brownish-gray, micaceous, calcareous, highly microfossiliferous. , Core 81. Recovery 5 ft. Like core 80 at 29963005 ft. 3015-3025 Core 82. Recovery 6 ft. No change. 3025-3035 Core 83. ' Recovery 5 ft. . Top 3 ft. Shale, brownish-gray, somewhat micaceous, calcareous, very highly microfossiliferous, containing comminuted fossil debris, 'specimens of, iinall Foraminifera and very abundant Inoceramus prisms and fragments. Microfauna consists, mainly, ., LoGS OF SELECTED WELLS IN THE COASTAL PLAIN OF GEORGIA 17 Depth (feet) 3035-3045 3045-3055 3055-3065 3065-3075 Description of Globiaerina oretacea, Gumbelina r&Ussi, Gumbelina moremani (specimens rare in preceding samples, common in this sample), a small Anomalina sp., a few specimens of Globotruncana, a large, flat fonn of Globigerina(?) cretacea (common), and a few specimens of Globoro talites 1tmbilicatu8. Bottom 2 feet. No samples. Core 84. Recovery 10 ft. Top 9 feet. Like core 83 at 3025-3035 it; contains abundant fragments of Inoc cramr..us and other bivalves. Specimens of Globotruncana are more' common than in core 83. Bottom 1 foot. Shale, light-gray, hard, dense, calcareous. Inoee. ra:mus fragments, are relatively scarce, but material is too wellindurated for fauna to wash from sample. Specimens identified are same as in core 83. Core 85. Recovery 10 ft. ' Top 5 (?) feet. Shale, brownish-gray, calcareous, very highly fossiliferous, giving shale a somewhat speckled appearance. No marked change in microfauna.. 2nd 4 feet. Marl, gray, somewhat micaceous, light-speckled owing to abundance of bwceram1ts fragments and comminuted fossil debris. No marked change fI1: microfauna. Bottom (1) 1 foot. Shale, light-gray, hard, dense, calcareous, ." microfossiliferous. Core 86. Recovery 8 ft. Top 2 feet. Material like bottom of core 85 at 3045-3055 ft. and lenses of smooth, dark-gray, flaky shale containing many irregular-shaped, gray, phosphatic nodules. Bottom 6 feet. Shale, greenish-gray, flaky, micaceous, containing crushed fragments of fossil (?) material and some fragments of fish scales. Microfauna consists of 'several species of Giimbc~ lina, Globigerina cretacea (small variety), specimens of Globorotalites wrnbilicatus, a few specimens of Globotruncana creta~ea, and specimens of Planulina eaalefordensis, Core 87. Recovery 10 ft. Shale,' gray, flaky, calcareous, similarto cor e 86; contains small fragments of fish scales and an irregular-shaped area in which large amounts ' of crushed chalky material seem to be composed -of small, broken fragments of fossils. . Third 2 feet. Shale, dark-gray, flaky, slightly micaceous, calcareous. The speckled appearance of the shale is due to many rather evenly distributed small chalky .specimens of Foraminifera and fragments of Inoc eraanus, An An01nalina sp. and two species of Gumbelina are the dominant specimens of Foraminifera, and specimens of Eo1tvigerina cf. E. austiniana are also present. 18 D epth (feet) 3075-3085 3085-3096 3090-3100 3095-3105 3105-3115 3115-3125 3126-3135 GEORGIA , GEOLOGICAL SURVEY BULLETIN 74 Description Core 88. Recovery 5 ft. Like core 87 at 3065-3075 ft. Core 89. Recovery 7 ft. No change. Fragments of Citharina texana var. were first observed in this sample of cuttings, but the highest occurrence in ' the well may have been above this depth. Core 90. Recovery 10 ft. Top 5 feet. Shale, gray, flaky, microfossiliferous, like that described for the third 2' feet of core 87 at 3065-3075 ft. Core 90 contains fragments of Inoceramu8 and other macrofossils. Foraminiferal fauna is like core 87, but specimens of Globiqerina cretacea var, are mu ch more' common, and some specimens of Glohotruncana are present. Bottom 5 ft. Like the top 5 ft. but specimens of Foraminifera are less abundant and some specimens of Citha1'ina texana var, are present. Core 91. Recovery 10 ft. Like core 90 at 3095-3105 ft. Fragments of Inoceramus and other macrofossils are present; microfauna is like core 90. o Core 92. Recovery 10 ft. Like core 91 at 3105-3115 ft. with the addition of tubular inclusions of 'pyrite. Inoceramus fragm ents are common. Microfauna is like core 91 but specimens are somewhat less abundant; specimens of Citharina texana var. are common, Core 93. Recovery 7 ft. Like core 92 at 3115-3125 ft, Specimens of Dorothia alexanderi are present. Atkinson Formation. Upper Member. 3135-3145 3145-3155 Core 94. Recovery 10 ft. Top of deeper-water marine facies of upper member of Atkinson Formation. Top 91,-2 feet. Clay, dark brownish-gray, flaky, highly sandy and micaceous, somewhat carbonaceous and pyritic; contains many fragments of Osireo: sp. The sand grains are fine, even, and angular. Bottom 1h foot. Sandstone, soft, somewhat argillaceous, glauconitic, micaceous; the grains are fine, even angular, clear quartz. ' 0 Core 95. Recovery 10 ft. < Top 5 feet. Sandstone like bottom of core 94 at 3J135-3145 ft., . containing some thin lenses of brownish-gray, flaky, micaceous, carbonaceous, somewhat glauconitic clay. Fragments of Ostrea sp, are common. Bottom 5 feet. Like top 5 feet, but only slightly glauconitic. LOGS OF SELECTED WELLS IN THE C OASTAL PLAIN OF G EORGIA 19 Dept h (feet) 3155-3165 . 3165-3175 3175-3185 3185-319 5 3195-3205 3205-3215 3215-3225 3225-3235 3235-3245 Description Core 96. Recovery 9 f t. Top 7 f eet. Clay, light-gray, highly sandy (fine-grained sand), highly-micaceous, gla uconiti c, calcareous. . Bottom 2 feet. Clay, greeni sh-gray, irregularly sandy (v ery f ine grained sa nd ), micaceous, gla uconitic, ca r bonaceous, calc areou s. The clay contains numerous reddish-bro wn, small, irregular-shaped nodules of sid erite, and some fragments of fish scales. A few spe cim ens of Globig erina creta eea in the washed sample may not be indig enous. Cor e 97. Recovery 9 ft. Clay, g reenish-gr ay, sof t , somewh at sandy (fine-grained sand ) , hi ghly mi cac eous, (biotite and muscovite ), cal careous, sligh tly carbona ceous. Th e ' clay contains some 'small, grayish-brown, irregular-sha ped nodules of side rite. Core 98. Re covery 10 f t . Clay, greenish-gray, flaky, mi caceous, cal careous, containing irregular, hi ghly sandy (f ine-graine d ' sand ), glauconit ic areas. The clay contains sm all gra y and light-brown, irregular-shaped nodul es of si derite. Cor e 99. Re covery 1 f t. Sha le, olive-gray, flaky, somewhat micaceous , slig htl y carbonaceous, calcare ous. Core 100. Recovery 10 ft. Shale, like core 99 at 3185-3195 ft. bu t irregularly sandy (f inegrained s a nd ), and more hi ghly mica ceous. The shale contains some f ragments of fi sh bone s, f ish scales, an d nodul es of siderite. The fauna is composed of a few I noceramus prism s and sp ecimens of Planulina ca plefordeneie, Giimbelina sp., Valvu lineria infrequens var., Globiqerino. cr eta cea, and Ha e tut erinella moremani Cushman. Core 101. Recov ery 7 ft. Like cor e 100 at 3195-3205 ft. Cor e 102. Recovery 10 ft. Cla y, olive-g ray, sandy (v ery fi ne grained sand) , mica ceous; contains fragm ents of f ossil biva lves," fis h bon es and teeth, phosphatic nodules, a little glauconite a nd a f ew spe cimens of F oramin ifera like-core 100 at 3195-3205 ft. Core 103. Recovery 7 f t . Shale, greenish-gray, flaky, somew ha t micaceous, containing irregular areas and thin lenses which are highly . sa ndy (fin egraine d sa nd) and somewh at glauconiti c. The fauna is composed of sm all scattered fra gments of fi sh bone s and sca les, and a few specime ns of For aminif era lik e core 100 at 3195-3205 f t . 'Core 104. Recovery 10 ft. Top 7 fe et. Marl, gray, thinly laminated , slig ht ly micaceous, containing irregul ar areas of very f ine graine d sand. Middle 5 feet. Lik e the t op 7 fee t. Contains abundant specimens 20 Depth (feet) 3245-3255 3255-3261 3261-3266 3266-3271 3271-3276 GEORGIA GEOLOGICAL SURVEY BULLETIN 74 Description of Foraminifera; Planulina eealei or deneie, G.umbelina', moremani, Globioerina , eretacea var., and a very. few specimens of Globoirumcama. cf. G. area, AmmQbaculite~ sp. and Gaudryina cf. G. foeda, Bottom 3 feet. Marl, greenish-gray icontains a species of Massilina characteristic of the Eagle Ford shale in Texas. Core 105. Recovery 10 ft. Top 5 feet. Marl, gray, thinly laminated, micaceous; contains fish scales and specimens of Foraminifera. Bottom 5 feet. Marl, gray, flaky, slightly micaceous;' contains fish scales and many specimens of Furaminifera. Core 106. Recovery 5 it. :, Top' 3 feet. Shale, greenish-gray, irregularly sandy (moderately coarse grained sand) , somewhat glauconitic. Bottom 2 feet. Shale, gray, smooth.fhinly laminated, containing fragments of macrofossils, and irregular light-gray silty and micaceous areas. Core 107. Recovery 2 ft. Top of shallow-water marine facies of upper member of Atkinson Formation. The electric log shows the top of 3253 ft. Top 1 foot. Sandstone, light-gray, hard, moderately coarse grained, clear quartz and a few peach-colored grains. Contains fragments of Ostrea sp., and some' sca tt er ed nodules of glau, conite. Bottom 1 foot. Shale, gray, smooth, moderately soft, argilla- ceous, moderately fine grained. sandstone, containing fragm ents of carbonaceous material. ' Core 108. Recovery 5 feet. Top 1 foot. Sandstone, greenish-gray, moderately hard, argilla ceous, micaceous, slightly glauconitic and sandy clay. Sand is very fine to moderately fine 'grained. Core contains fragments of macrofossils. Second 1 foot. Clay, gray, highly micaceous, sandy (very fine grained sand), containing areas of smooth, ' blue-gray, marly, ,'" shale. A few shell fragm ents present in the core. Bottom 3 feet. Clay, shaly, greenish-gray, highly micaceous, sandy (fine-grained sand), carbonaceous. Core contains many fragments of fossil bivalves. Core 109. Recovery 4 ft. Top. Like, bottom 3 feet of core 108 at 3266-3271 ft. but more coarsely sandy. The sand is gray, argillaceous, highly mica- ceous. . Bottom. Sandstone, light-gray, moderately soft, argillaceous; moderately fine' grained, micaceous; contains a few fragments of fossil bivalves and numerous fragments of carbonaceous material. LOGS OF SELECTED 'WELLS IN THE COASTAL PLAIN OF GEORGIA 21 Depth (feet ) Description 3276-3286 , :w;Core'.110. Recovery 5 ft. . ',. ' ~; ... Top. Shale, greenish-gray, thinly flaky, highly micaceous, slight- ly carbonaceous. . Bottom. Like the t op 'pa r t but more highly carbonaceous, and .. cont aini ng shell fragments: 3286-3293 Core 111. Recovery 2 fe et. Top 1 foot. Sandstone, light-gray, hard, dense, moderately fine grained; cont ai n s numerous fragmen ts of GrYphea sp ., and small nodules of black (phosphatic?) material: . . _ " ,. ! Bottom '1 foot. Alternating thin lens es of gray shale and very fine to 'm oder ately 'fine grained; glauconitic, micaceous, argillaceous sa n dst one. . Core cont ains' fragments of fo ssil bivalves. 3293-3298 ' Code i12. Recovery 2 ft. " Sandstone, '.white, soft, micaceous , ' argillaceous: very fine to moderately fine grained. 3298-3308 Core 113. Recov ery % ft. Sandstone, light-gray, hard, dense, fine to moderately fin e grained ; cont ain s many fragments of fossil bivalves, fragments of ' carbonaceous material, and phosphatic nodules. . 3308-3318 Core 114. Rec overy 6 ft. Top 4 feet. Sandstone, .light-gray, .sof t , argillaceous, fine c grained, highly micaceous, somewhat ca rbonaceous, slightly glauI ,conid c. . " ....} . Bottom 2 feet. - Shale, greenish-gray, thinly' flaky, somewhat . 'm icaceou s, irregularly interbedded with moderately fine grained argillaceous sandstone. The shale contains lenses of light-gray, slightly' 'car bon aceou s siltstone in which siderite pellets are present. 3318-3328 Core 115. Recovery 8 ft. . Top 4 fe et. Shale, greenish-gray, micaceous, intergrading with light-gray, highly micaceous siltstone. , 'T he core con t ain s fragments of carbonaceous material, phosphatic material, and a few traces of macrofossils. . 2nd 2 feet. Sandstone, light-gray, moderately hard, moderately fine grained, argillaceous, highly glauconitic and micaceous. Bottom 2 .f eet. Like the 2nd 2 feet but sandstone is somewhat . coarser grained. . : , i~ . 3328-3338 ' , Cor e 116. Recovery 5 ft. .. ~" 1 Top' 4 ft. Sandstone, light-gray; moderately' soft, moderately fine grained, highly glauconitic "an d micaceous. ( ... I J~ Bottom 1 foot. Sandstone, light-gray, moderately soft, silty to moderately coarse rgr a ined, ' cr oss-bedded, mi caceous, somewhat (. 3338-3347 carbonaceous. Core 117: Recovery 5 ft. Top 1 foot; Sandstone, Iight-gray, moderately hard, fine to moderately fine grained, argillaceous, 'gla uconit ic, somewhat 22 D ep th ( f eet) 3347-3357 3357-33 67 3367-3377 3377-3387 3387-3397 3397-3407 3407-3413 3413-3423 3423-3433 GEORGIA GEOLOGICAL S URVEY BULLETIN 74 . Description micaceous; contains fragm ents of fossil bivalves and many fragments of . pho sphatic material. Bottom 4 f eet. Sandstone, moder ate ly soft, fine to moderately fine grained, glauconit ic, ar gillaceou s, somewhat mic aceous; contains many inclus ions of carbonaceous material. Cor e 118. Recovery 5 ft. Sands tone , . light-gray, sof t , sil t y to moderately fine grained, gla uconitic. _. Cor e 119. Recovery 10 ft. Top 1 f oot. Sa ndston e, light greenish-gray, like core 118 at 3347-3357 f eet ; contains many fragments of phosphatic material. 2nd 1 foot. Sandsto ne, light-gray , loosely consolida ted, very fine t o moderately coa r se grained, glauconitic, mi ca ceous. Bottom 8 fe et. . Sandstone, loosely con solidated , silty to fine to coarse gr aine d, gla uconitic, mica ceous, Core 120. Recovery 5 ft. Top 1 foot. Sandstone, loosely -consolidated, fine to coarsegrained, mica ceous. Bottom 4 f eet. Sa ndstone, light-gray, silty to fine to moderately fin e grained, hi ghly mi cac eou s, slightly -glauconitic. Core 121. Recovery 6 ft. Top 1 foot. Sa ndstone, light-gray, moderately soft, fine to moderately coarse gra ine d, somewhat carbonaceous. 2nd 1 f oot. Sandst one , soft, silty to fine to coa rse-gr ained, somewhat mic aceous, ca rbo naceous; cont ains nodules of lightbrown to yellowi sh, soft limonite. Bottom 4 f eet. Silt st one , light-gray, moderately soft, micaceous. Cor e 122. Recovery 8 ft. . Like bottom 4 fe et of core 121 at 3377-3387 ft. Cor e 123. Recovery 4 ft. Sandstone, light-gray, moderately soft , coar se-gr ained, argil- lac eous, micaceous. Cor e 124. Recovery If.! ft. Sandstone, light-gray, fine-grained, micaceous. Core 125. Recovery 4 ft. c Top 1 foot. Sandstone, light-gray, hard, dens e, conglomeratic (fine to coarse-grained sand) . Contains irregular-shaped inclusions of light gr eenish-gr ay and dark-gray clay; black, carbonaceous, highly pyritic clay; a f ew nodules' of limonite; and a trace of gla uconite . Bottom 3 feet. Sandstone, light-gray, moderately soft, moderately fine grained, argillaceous. Core 126. Recovery 4 ft. Sandsto ne, light- gray, sof t , poorly sorted, moderately ' fine t o moderately coarse grained, a r gillaceous, containing highly micaceous, glauconitic, a nd lign itic lenses. LOGS OF SELECTED WELLS IN THE COASTAL PLAIN OF GEORGIA 23 De p th (f ee t ) 3433-3440 3440-3450 3450-34 60 3460-3470 3470-3480 '. 3480-3490 3490-3498 3498-3508 3508-3518 3518-3538 Description Cor e 127. Recovery 7 ft. Sandstone, light-gray, silty to fine-grained, highly micaceous. Cor e 128. Recovery 7 ft. Top 5 feet. Like core 127 at 3433-3440 ft. and contains glau- conitic -streaks and fragments' of carbonaceous material. Bottom 2 feet. Clay, greenish-gray, silty, so~ewhat micaceous. Core 129. Recovery 3 ft. Top 2 f eet. Sandstone, light-gray, soft; fine-grained, silty mi- caceous. ' : 1.; ,~ . ' ' Bottom 1 fo ot . Sandstone, white, moderately hard, moderately fine grained, micaceous. Core 130. Recovery ' 2 ft. Clay, gray and greenish-gray, moderately hard.. containing Irregular streaks of highly sandy (coarse-grained sand), somewhat micaceous carbonaceous clay. Core 131. Recovery 9 ft. Sandstone, light-gray, soft, silty, mi caceous, slightly glauconitic. The sand is, mainly, very fine grained,but a few coarse grains are present. Core 132. Recovery 10 ft. Sandstone, light-gray, soft, silty, high .micaceous, glauconitic, slightly carbonaceous. Core 133. Recov ery 2 ft. Silt stone, light-gray, soft, highly micaceous, somewhat glau- ,.' ; conitic, somewhat ca rbonaceous. Core 134. Recovery 3 ft. Top 1 foot. Sandstone, light-gray, hard dense, moderately coarse grained, very highly micaceous, glauconitic, and pyritic. MiddleL foot. r Sandstone, greeni sh-gray, soft, silty, fine-grained, very highly micaceous and glauconitic, containing inclusions of carbonaceous material. Bottom 1 foot. Sa ndst one, white, soft, fine-grained, silty ")mi- ,; cac eous. Core 135. Recovery 4 ft. Top 2 feet. Shale, g r eenish-gra y, unctuous, flaky. Bottom 2 fe et. Sandstone, white, moderately hard, fine-grained, silty, micaceous. Cor e 136. Recovery 9 ft. . Top 5 feet. Sandstone, moderately hard, dense, fine to moderately, fine grained; argillaceous. vmicaceous, containing many small scattered fragments of soft yellowish-brown limonite ( 7) Middle 1 foot. Clay, light greenish-gray, moderately hard, silty, micaceous. Bottom 3 feet. Sandstone, greenish-gray, moderately hard, poor. ly sorted, fine to moderately coarse grained, argillaceous, mi- caceous, containing inclusions of limonite (7). 24 GEORGIA G EOLOGICAL SURVEY BULLETIN 74 D epth (f eet) Description ~ J . " .J. ) 3538-3558 3558-3578 Core 138. Recovery 5 ft. .', ' Top 1 foot. Siltstone, greenish-gray, dense, finely micaceous, containing:many fragments of carbonized plant remains. . . Bottom 4 feet. Sandstone, light greenish-gray, soft, moderately fin e to coarse grained, silty; ' argillaceous. Core 138. Recovery O. '. -~ 3578-3598 Core 139. Recovery 5 ft. .. .... - .; . Top' 2 feet. Sandstone. light-gray, moderatelyhard, dense, mod- erately coarse-grained, slightly pYriti~. The sand grains are clear quartz. ' j . :' Middle, 1 foot. Siltstone, white, soft, micaceous. .,> .Bottom 2 f eet. Sandstone. j.light-gray, moderately hard, moderately coarse to coarse-grained, somewhat pyritic, containing worn fragments of a bivalve ' Ostrea (1) sp, 3598-3618 Core 140. Recovery 3 ft. .. .~ 'Top 1 foot. Sandstone, gray, hard, dense, coarse-grained, quartz- itic, cont aining many irregular-shaped inclusions of greenish- gray clay, glauconite and carbonaceous plant fragments. 2nd 1 foot. Clay, light greenish-gray, micaceous, highly sandy (fine-grained sand). 3d 4 inches. Sandstone, white, moderately hard, dense, mod- rately fine-grained, glauconitic. ;, i., 4th, 5 ' inches. Sandstone, greenish-gray, moderately coarse grained, argillaceous, micaceous, containing' iriclusions of thinly laminated green shale that seem to have been secondarily3'de1 posited in the sandstone. t .. 5th 3 inches. Sandstone, light-gray, moderately hard, moderate- " ' 1 , '.'; Iy fine to coarse-grained, mainly', clear quartz but cont a ining peach-colored grains; 3618-3638 Core 141. Recovery 4 ft. Top 1 foot. Sandstone, light-gray, hard, dense, moderately fine grained, micaceous, clear quartz, containing a f ew pinkish grains, dark-green nodules of ' glauconite, and ' highly pyritic areas. . . :. ~ 2nd 1 foot. Like top 1 foot. 3d 1 foot. Sandstone, light-gray, hard, fine-grained, micaceous, glauconitic. -e .., v .' . .. , . " 4th 1 foot. Clay, 'green ish-gray, slightly sandy, micaceous and somewhat carbonaceous. 3638-3658 Core 142. , Recovery 3 ft. Top 1 foot. Sandstone, moderately hard, ' moderately coarse . grained, micaceous, glauconitic" containing fragments of ca r- bonaceous matertal, a few phosphatic .nodules and greenish-gray inclusions ' ( pr obably ' secondary), . :''-;J - LOGS OF SELECTED WELLS IN THE COASTAL PLAIN OF GEORGIA 25 Dep th (feet) 3658-3678 3678-3698 3698-3718 3700-3720 Description Middle 1 foot. Silt, gray, somewhat carbonaceous, containing irregular areas that are sandy, micaceous and slightly glauco.n it ic, ' Bottom 1 f oot. Sandstone, light-gray, hard, dense, moderately coarse-grained, micaceous, glauconitic. Core 143. Recovery 8 ft. Top 1 foot. Sandstone, hard, moderately coarse-grained, calcareous, glauconitic, composed mainly of clear quartz grains and few pink or peach-colored grains. 2nd 1 foot. Shale, greenish-gray, thinly flaky, silty to sandy, containing a few sma ll carbonaceous fragments. 3d 2 feet. Sandstone, light-gray, hard, moderately coarse grained, micaceous, glauconitic, containing -numerous inclusions Of carbonized plant fragm ents. 4th 2 feet. Clay, greenish-gray, silty, micaceous, containing lenses of dark-greenish-gray thinly laminated shale. . ' 5th 2 fe et. Sandstone, light-gray, hard, dense, moderately fine grained, micaceous, glauconitic. Core 144. Recovery 8 ft. Top 3 fe et. Shale, greenish-gray, flaky, micaceous, containing communinuted carbonaceous fragments, ' 2nd 1 fo ot. Con glomerate, composed of dense, moderately fine grained, glauconitic sandston~ containing secondary nodular inclusions' 'of green and dark brownish-gray clay, limonite nodul es, many worn and broken sh ell fragments, and fragm ents of carbonaceous material. Another part of the core is soft, coarsegrained, micaceous sandstone. 3d 3 feet. Siltstone , light-gray, glauconitic, micaceous, and lenses of dark greenish-gray, unctuous shale. 4th 1 f oot . Sandstone, light-gray, hard, dense, conglomeratic, glauconitic; contains worn sh ell-fragments, fragments of pyritized 'lig nit e, and nodular fragm ents of greenish-gray clay and of limonite. Another part of the core is den se, glauconitic, micaceous sandstone 'con t ain ing abundant small scattered frag: ments of limonite. '-0 Core 145. Recovery 7 -ft. Top 3 feet . Sandstone, light-gray, dense, very highly micaceous (muscovite and biotite), glauconitic. Bottom 4 feet. Shale, greenish-gray to dark green, smoothtextured, slightly micaceous and carbonaceous, non-calcareous. The bottom foot is irregularly highly sandy (fine-grained sand) and micaceous: Clay, brownish-gray, micaceous and fragments of light-gray and brownish-gray sandstone j shell fragments present. 26 Depth (feet ) 3720-37 30 37303 750 3750-3760 3760-3770 3770-3790 3790-3800 3800-3810 3810-3820 3820-3830 3830-3840 3840-3850 3850-3860 3860-3870 G E ORGIA G EOL OGICAL S URVEY ' B ULLETIN 74 Description Atkinson Formation. Lower Member. Shale, greenish-gray, and many fragments of white, moderately fine grained glauconitic, micaceous sandstone] numerous shell fragments and a few carbonaceous fragments. . Top of t he lower member of the Atk inson Formation (marine fa cies ) is at 3723 ft. on the elect ric log of the well. Like sample at 3720-3730 ft. Like sample at 3730-3750 ft; fragments of lignite are common, and a f ew, probably ind igenous spec imens of ostracodes are present. Shale, gr ay an d g reenis h-gr ay , an d man y fragm ents of irregularly sandy, som ewhat glauconitic, highly macrofos siliferous lim estone, which al so contain sp ecim ens of ostracodes like those in sample at 3750-3760 ft. Th e sample cont a ins f r agment s of sandstone and fr agments of lignite. No change. Shale, olive-gray, flaky, and fragments of fossiliferous limestone. Like sample at 3790-3800 f t ; fragm ents of f ossil biv alves; limestone fr agments more abundant. . Sh al e, olive-gray, fragments of Ostr ea('l) sp ., and several types' of san dstone. Sample contains sp ecimens .of Ammobaculites agr estis and Ammotiltm braunsteini. . Shale, gr eeni sh-gray, flaky, somewhat micaceous. Shale, gray, cont ai ning shell fragments. Shale, g reeni sh-g r ay, fl aky, 50 percent; and 50 percent moderately coarse grained quartz sandstone containing grains of pink feldspar. Lik e samp le a t 3840-3850 ft., but sandstone is less than 50 percent. Shale, greenish-gray, flaky, a little sa ndst one , and numerous fragments of white bentonite. Comanche Series. Und iff erenti at ed 3870-3880 Shale, flaky, and coa r se-g rai ne d sandstone like sample at 3860- 3870 ft. Sample al so contains f ragments of sandy (fine-grained sand) bentoni te, f ir st observed in sample at 3860-3870 f t. , numero us f ragments of bro wnish and purpli sh-redmicace~us cla y ; siderit e pellets (poss ibly cav ing from higher levels) ; fragments of pink-stained, nodular limestone. ,i 3880-3890 Shale, gray an d greeni sh-gray, flaky, and many fragments of brick-red , purplish- r ed , red and gray mottled, and mustard and f gray mot tled, mi caceous, sa ndy shale ; light greenish-br own sid erite nodules ; pink-stained limestone nodules ; a little coarse- grained, unconsolidated sand. 3890-3900 Like sample a t 3880-3890 ft., but no limestone nodules. , LOGS OF SELECTED WELLS IN THE COASTAL PLAIN OF GEORGIA 27 f ~. : Depth (f ee t ) Description 3900-3910 Sand, unconsolidated, coarse-grained; quartz, and scattered grains " of f eldsp ar, abou t 75 jJercen t; gray, thinly "flaky shale, and r 3910-3920 red and multicolored shale about 25 percent of sample. Sand, coarse-grained, and shale like sample at 3900-391(i ft., sam- ,,r ; ple contains many grains of pink and yellow feldspar, and a f ew grains of greeni sh-yello w quartz ( 1) . 3920-3930 Like sample at 3910-3920 ft., but shale fragments are more abun- dant. 3930-3940 No change. 3940-3950 Like sample at 3930-3940 ft., but fragm ents of red shale, red and mustard mottled shale, and purple shale are very abundant. 3950-3960 ' Sand, unc onsolidated, pinkish-gray, coa rse-gra ined, quartz, and many red-stained grains. Sample contains fragments of red, purple and mottled shale. . 3960-4060 ' No change. 4060-4070 4070-4080 4080-4090 Mudstone, gray, r ed, purple, a nd mottled ; unconsolidated sand like that described in sample at 3950-3960 ft. Grains of feld spar ar e comm on , and fragments of sh ale are abundant. Clay, red, and fine t o very coarse grained quartz sand; a little feldspar. Sand, fin e to very coarse grained; a little red feldspar. 4090-4095 4095-4100 4097-4102 Sand, like sample at 4080-4090 ft ; a little red shale; abundant' cavings of gray shale. Clay sha le, bright r ed, 50 percent of sample ; cavings of gray shale 50 percent. Cor e 146. Recovery O. 4100-4110 Clay, gray, one-third of sample ; clay sha le, one-third of sample; sand, one-third of sample. 4110-4120 Clay shale, red 75 percent; sand 25 percent. 4120-4130 L .. Sand, fine to very coarse grained, subangular, r ed-stained quartz; staining probably from red clay matrix. Yell ow grains of quartz, and grains of f eldspar are present, 4130-41 40 Sand, like sample at 4120-4130 ft. 4140-4150 Sand, yellow-tinted grains, and bright yellow clay that is probably the matrix in whi ch the sand occurs ; a few varicolored pebbl es of igneous (1) ro cks; rounded p ebbles of red and yell ow f eldspar ; rounded pebbles of yellow quartz. 4150-4160 Sand, moderately coa r se grained, quartz; grains of feldspar and , a little red clay. , 4160-4170 Sand, fine to very coarse grained, quartz; a little feldspar; a few pebbles of ign eous (1 ) rocks; a few small fragm ents of red clay. 4164-4167 Cor e 147. Recov ery 3 f t. Top. Clay; brownish-red, silty, micaceous. 1,- '" 28 Depth (feet) 4170 -4180 4180-4190 4190-4200 4.200-4210 ,4210-4220 GEORGIA GEOLOGICAL SURVEY BULLETIN 74 Description Bottom. Like top sample, and irregularly streaked with light bluish-gray, silty to sandy (fine-grained sand), argillaceous clay. Clay, red, 75 percent; sand, like sample at 4160-4170 25 percen t. 'N o change. Sand, 50 percent; clay 50 percent. Sand is in part, like sample at 4160-4170 ft.; and in part, fraginents of fine-grained , evengrained, soft sandsto ne containing grains of red feldspar, and hard yellow clay. Sandstone, fine to very coarse grained, compo sed of yellow and red-stained grains, a nd a f ew grains of f eldspar ; al so mediumgrained sandstone having small amou.nt o.. f ma.trix. Sand, yellow and white, mostly coarse-grained, quartz and a little feldspar. . Pre-Cretaceous 4220-4280 Igneous rock. 4279-42821f.l . Core 148. Recovery 3 ft. Igneous rock. 4280-4296 T.D. No samples. BACON COUNTY Operator ; City of Alma Well 1 Location: City of Alma, Ga. GGS: No. 58 Elevation: 195 ft. (approx.) Total depth: 626 ft. ' Completed: .May 20; 1938 . Summary of Stratigraphy Tertiary Depth Thic kness (feet) " (feet) " ,. Pliocene to Recent -~------------------ ~_~~ ~ ~ ~ Surface 50 No samples ~___ 50 14 Miocene 'undiffer entiat ed Ol. igocene upper, , Suwannee Limestone .. Eocene ... . . upper, Ocala Limestone '. ~~________ 64 '" 386 450 50 to upper member 500 total 126 . depth- Lithologic and paleontologic description of cut- tings and cores. Samples are' cuttings unle ss otherwise stated. \, r 1 ! \ i ! - LOGS OF SELECTED WELLS IN THE COASTAL PLAIN OF GEORGIA 29 Depth (feet) 0- 10 10- 40 40- 50 50- 64 Description Pliocene Series to Recent Series Sand, quartz, dark, reddish-brown, coarse-grained argillaceous. Clay, red, sandy. 'W a sh ed residue, large; composed of fine-grained, angular, clear quartz sand, red-stained by the clay matrix. ' Sand, quartz, clear, coarse-grained, subangular; etched. No samples. 64- 118 118 118- 140 140- 150 150- 160 160- 170 170- 180 180- 190 ' 190- 200 200- 210 210- 220 220- 230 230- 240 Miocene Series undifferentiated Clay, greenish-gray, sandy. Washed residue, large; composed of' fine-grained, angular, clear quartz sand, and several fragments of carbonaceous material. Clay, greenish-gray, sandy. Washed residue, large; composed of moderately coarse grained, subangular, moderately even grained, clear quartz sand, and a few fragments of the clay matrix. ' Chalk, white, sandy, soft. Washed residue, large; composed, chiefly, of nodules of hard sandy chalk, some of which contain worn fragments of macroscopic fossils (Ostrea (?) sp.); about 10 percent of washed residue is clear, uneven-grained, quartz ' sand. Clay, greenish-tan, sandy. Washed residue, ' moderately small; composed of fragments of clay and about 50 percent clear, angular, uneven-grained quartz sand. Clay, light-tan, sandy. Washed residue, small; composed of clear quartz sand, a few nodules .of 'hard limestone as in sample at 118-140 ft., and a few fragments of greenish-gray carbonaceous clay. ' Clay, tan, sandy. Washed residue, moderately large; composed of very uneven grained, clear. quartz ' sand, and about 10 percent fragments of hard clay. "Clay, tan, somewhat sandy. Washed residue, small; composed of fragments of hard clay, and about 50 percent very uneven grain- ed clear quartz sand. . Clay, greenish-tan, sandy. Washed residue, moderately large; composed of nodular fragm ents of hard calcareous clay, and about 50 percent very uneven grained clear quartz sand. Clay, light-brown, sandy. Washed residue, moderately large; composed of very uneven grained, angular, clear quartz sand. Sand, quartz, clear, angular, un even-grained, and about 25 percent light-brown chert; a few fragments of white chalky limestone. Sand, .quartz, clear, uneven-grained; a few fragments of ' white chalky limestone, as in the sample at 200-210 ft., and a few fragments of grayish-green, sandy clay shale. Limestone, cream, soft , chalky, irregularly sandy, and about 25 percent uneven-grained quartz sand; a small amount of light-brown chert. .Limest one, white, chalky, sandy, and greenish-gray, shaly, sandy clay. Washed residue, moderately large; composed of fragments 30 Depth (feet) 240- 260 260- 270 270- 280 . 280- 290 290- 300 300- 310 310- 320 320- 340 340- 350 350-' 360 360- 370 . 370- 380 , 380- 400 400- 410 410- 430 GEORGIA GEOLOGICAL SURVEY BULLETIN 74 Description of hard limestone, and nodular fragm ents of calcareous clay; about 25 percent of the washed residue is uneven-grained, clear quartz sand. Clay, greenish-tan, Washed residue, sm all ; composed of small fragments of clay, and about 50 percent very un even grained clear quartz sand; a few small, black, phosphatic p ebbles. Chalk, soft, sandy. Washed re sidue, moderately large; compo sed of about 75 percent nodular fragments of hard sandy chalk con- taining inclusions of shells (ostracodes r) : about 25 percent fin e, angular, clear quartz sand, and a few small, black, phosphatic ~~ . Like sample at 260-270 feet, but nodular fragments of limestone constitute about: 25 percent of the washed residue, and sand con- stitutes about 75 percent. . Sand, fine, uneven-grained, and a f ew nodules of hard sandy chalk. Clay, tan, sandy (fine-grained sand). -W a shed residue, very sma ll ; composed of fine-grained, angular, clear quartz sand, and a f ew resistant fragments of light greenish-gray unctuous clay. Clay, greenish-tan, sandy. Washed residue, small; composed of fine-grained, angular, clear (white) quartz sand. Clay, greenish-gray, sandy (fine-grained sand). Washed residue, small; composed of fine-grained sand, and about 10 percent small, tough fragments of clay. Bit sample. Clay, gray, sandy. Washed r esidue, small; composed of moderately coarse grained, clear quartz sand, and a few fragments of light-green clay. Clay, greenish-gray, somewhat sandy. Washed residue, very small; composed of sand like sample at 320-340 ft., and about 10 percent fragments of hard clay. Clay, greenish-gray, sandy. Washed residue is small, and similar to the sample at 340-350 ft. Clay, sandy, and chalk. Washed residue, large; composed of fragm ents of hard sandy, chalky limestone, arid about 25 percent uneven-grained, clear quartz sand. Some fragments of limestone show traces of embedded worn and broken fossil shells. Like sample at 360-370 ft. ; sand composes about 75 percent of the sample. Limestone, white, nodular'; is about 50 percent of the sample, and coarse, uneven-grained quartz sand is about 50 percent. The limestone shows traces of worn and fragm ented fossil sh ells. Limestone, light-gray and light-tan, hard, nodular, sandy, containing traces of fragmented and very much worn fos sil shells. About 25 percent of the sample is composed of clear, angular, finegrained quartz sand. Limestone, white, sandy, nodular, cont a inin g a few sma ll , black, phosphatic pebbles, and many worn fragments of fossil shells, among which are Barnea sp. , Ostre sp., large echinoid spines, and crab claws. About 50 percent of the sample is composed of fine-grained, angular, clear quartz sand, and many small, black, phosphatic pebbles. AI L OGS OF S ELE CTE D WELLS IN THE CO AST AL PLAIN OF GEORGIA 31 Depth (feet) 430- 450 Description Like sa mp le at 410~430 f t ., but showing an in cr ea se in sand content. 460- 470 470- 490 490- 500 Oligoc ene Ser ies Upper Oligocene Suwannee Limestone. Lime sto ne, white, hard , nodular. Some f r agments of the limestone are por ous and oolitic, and m any f r agment s contain worn and broken fossil shells. Megaf ossil s a r e, chiely , () st r ea sp., Pect en sp., and E chinoids. Microfoss ils are, chiefly , mold s of .a small , sharply con ical fo r m of Cosk in olino. eooke i, poorl y-p r es erved sp ecimens of A r chaie sp. and R otalia cf. R . 7nex icana, and a f ew speci- mens of Gy psina sp ., E lphidiu7n cf. E . chapmani, Eponid es sp., and Quinqu eloculina sp p. ' . Limestone, white, hard, f ossili f erous , containing m any speci men s of: Coskinolina cookei (typical f or m ) V alvulammina sp , (C us hman and McGlame ry ) Quinq u eloculina cf. Q. lustra Quinq u elocu lina cf. Q. glabrata T ex tu laria cf. T. 8ubhauen-ii Valvulina sp, (Cushman and McGla mer y) E chinoid fr agment s No change. Sim ilar t o sam ples at 450-470 ft., but the fo ssil ma terial is less well preserved. 500- 510 510- 520 520- 530 530- 540 540- 550 Eocene Series Upp er Eocene. Ocala Limestone. U ppe r Member, . Limeston e, cream, hard, hi ghly f ossiliferou s. The dominant macro- f ossils are f ragments of Bryozoa , Ostrea sp., a n d P ect en sp. Microfossils are, chi efly, speci me ns of Operculin a cf, O. [loriden- sis, L ep idocy clina ocalana, Asterocyclina, georgiana, .Sp hae r o- gypsina glo bula. . N o sample. Limestone, cream, coquinoid, composed, mainly, of ca lcit ised bryo-, zoan fragm ents , many specimens of Op er culina sp., and a few s pecimens of L epidocyclin a s p. Limestone, wh it e, h ard, ' coqu inoid , composed of f ragments of . Bryozoa , Ostr ea sp ., Pect en sp., and man y specimens of species . of Fora mi n ifera as in sa mp le at 500-510 f t. Like sa m ple at 530-540 ft. , cont a in ing many sp ecim ens of Foraminifera. The most abundant species are : L ep idocy clina oealana Oper cu lina [ loridensie H et er ostegina ocalana A st e1'ocy clin a g eO'rgian a Ci bicid es lobatu lu e var, Spha er ogypsina globula. Epm ides bu dens is '- 32 GEORGIA GEOLOGICAL SURVEY BULLETIN 74 Depth (feet) Description Epvnides iacksonensis Eponides n. sp. Guttulina irregularis 550- 560 . Siplwnina iacksonensis Nonion advenum var. Like sample at 530-540 ft. The most abundant species are: _Operculina !loridensis, Asterocyclina ge01gmna, and H eterostegina ocalana. R obulus limbostw var. is fairly common, and other species are as listed in sample at 540-550 ft. 560- 570 " Like sample at 5 50~560 ft. 570- 580 Like sample at 550-560 ft. Specimens of L epidocyclina cf. L. cookei are common. 580- 590 No sample. - 590- 600 Like sample at 570-580 ft. 600- 626 T.D. Like sample at 570-580 ft. BROOKS COUNTY Operator: D. E. Hughes Landowner: E. M. Rogers, Sr., Welll B Location: Land District 12, Land Lot 454 2830 ft. south and- 1570 ft. west of northeast corner of Land Lot 454. GGS. No. 184 Elevation: 136ft. (derrick floor) -Total depth: 3850 ft. Completed: Apr. 12, 1949 Summary of Stratigraphy Tertiary Paleocene in beds containing Tamesi fauna; ~ 1st sample at 2200 ft. --- -------~-. -.__ Depth (feet) ? Th icknesa (feet) ? Cretaceous Gulf _Beds of Navarro ( ?) age or Taylor ( ?) age __ _ _ ____ _ __________ 2230 100 Beds of Taylor age (definite) ____________________ 2330 220 Beds of Austin age_______________________________________________________ 2550 540 Atkinson Formation, upper member----,------ --- 3090 300 do lower member______- - -- --- 3390 230 Comanche undifferentiated ________ _ _ _____.__ 3620 230 . . to total depth Lithologic and paleontologic description of cut- tings - and cores. Samples are cuttings .unless otherwise stated. ' ,;- . ~i \. . s. \' \ LOGS OF $ELECTED WELLS IN THE COASTAL PLAIN OF GEORGIA 33 \ Depth\ Description (feet) .:.\ 0-2200 Samples not studied. Tertiary . J; . s , ..' In Paleocene. .S.e..r.i.es 2200-2210 Shale, gray, marly, and fine to medium-grained sand, 50 percent of sample; specimens of species. of Foraminifera indicative of the beds of Paleocene age containing the Tainesi fauna, 50 per~ cent of sample. ' 2210-2220 Sample not studied. 2220-2230 Like sample at 2200-2210 ft. and some large nodules of glauconite. . 2230-2240 2240-2250 2250-2330. Cretaceous Gulf Series Beds of Navarro(?) age or Beds of Taylor(?) age. :Like sample at 2200-2210 ft., but contains 'a few specimens of -f .. Globotruncana sp. ~arking the top of the Cretaceous. a Shale, gray, marly, .and few fragments of glauconite about 50 percent of sample; fine to moderately coarse grained sand (pos sibly caving) about 50 percent of sample. Specimens of Globotruncana sp. and other Cretaceous Foraminifera present. Samples not studied. Beds of Taylor :age .(definite) 2330-2340 ~ Shale, gray, marly. Fauna consists 'of many specimens of Fora- minifera. including the typical Taylor .species Bolivinoides deco- . rata. arid Bolivina itncrassata.. ' 2340-2350 Marl, like sample at 2330-2340 ft., a little light-gray chalky marl, and specimens of StensiJciina americana: and Gl<>borotalites c~ icus. 2350-2550 -- Samples not described, but are composed, mainly, of mediumgrained sand and gray, soft, chalky marl and ..shade. 2550-2560 2560-2570 2570-2610 2610-2620 2620-2640 Beds of Austin age (electric log correlation) Shale, gray, several types, a little chalky marl, and a few fragments of white, hard unfossilif.'~r~us ( ?) ch!llk, about 50 percent of sample. Sand is about 50 percent of sample. The foraminiferal fauna contains specimens of typical Taylor species. " Marl, a little white hard chalk, fragments of Inoceramus, and the usual cavings of sa~d. Samples not studied. Similar, in general, to sample at 2560-2570 ft., but contains many Inoceramus fragTrtents and a few- chips of gray marly shale irregularly streaked With soft white chalk. Samples not studied. 34 Depth (feet) 2640-2650 2650-2660 2660-2670 2670-2680 2680-2740 2740-2750 2750-2760 2.760-2770 2770-2800 . 2800-2810 2810-2870 2870-2880 2880-2910 2910-2920 2920-3011 3011-3021 GEORGIA GEOLOGICAL .SURVEY BULLETIN 74 Description I JI Sand, 50 percent; several types of gray shale and a few fragments of chalk 50 percent. Material being drilled is possibly a soft white chalk containing many Inoceramus fragments and a nondiagnostic microfauna. Like sample at 2640-2650 ft and a few specimens of Planulina austiniana. Sample not studied. Like sample at 2640-2650 ft., and a few specimens of Kyphopyxa christne-~-i and Pseudogaudryinella capitosa var. (early Taylor or late Austin age). Samples not studied. Sample is mainly sand (caving?), fragments of gray shale, and foraminiferal specimens from various higher levels. A few fragments and nodules of white chalk probably indicate the material being drilled at this depth. Many nodules of pyrite are present, and also a few specimens of Foraminifera and. Ostracoda that are indicative of the early Taylor or late Austin age of the beds; Inoceramus fragments are fairly common. Sample not s~died. Mainly cavings of sand, gray marl, and specimens of Foraminifera. Samples are about 75 percent medium-grained, angular sand and 25 percent Inoce-1a:nw.s fragments and specimens of Foraminifera. Shale, gray, marly, a little sand, a few Inoceramus fragments, and a few specimens of Foraminifera that are not narrowly restricted. Also observed were a few specimens of Cythere simplicatc that is common in the beds of late Austin age although 'present in the beds of early Taylor age. Like the sample at.2800-2810 ft. Shale, gray, showing the typical speckled appearance of the lower part of the beds of Austin age. Like the sample at 2870-2880 ft. Shale, gray, marly, a little sand, and a few highly speckled fragments of shale. Specimens of Foraminifera are mainly Globigerina sp. and Gumbclina sp.; specimens of Globorotalia umbilicata (common in the lower part of the beds of Austin age in southern Georgia) are common. Fragments of Ostrea sp. are also present. Samples not studied. Core 2. Recovery 10 ft. Top. Sandstone, light-gray, soft, fine-grained, even-grained, argillaceous, micaceous slightly glauconitic. Middle. Sandstone, gray, fine-grained, argillaceous, micaceous, glauconitic, calcareous; fragments of Ostrea sp. present. Bottom. Like middle part of core. ,.. LOGS OF SELECTED WELLS IN THE COASTAL PLAIN OF GEORGIA 35 Depth (feet) 3021-3040 3040-3050 3050-3090 Description A sample of cuttings from this depth shows gray, ba1d, sandy nodules and many fragments of Ostrea sp., sug~esting a beach or near-shore depositional environment. Samples not studied. Sand and sandstone, like sample at 3011-3021 ft.; many fragments of white, hard, highly' sandy (fine-grained _sand)' somewhat glauconitic chalk; many . fragments of Ost1ea sp ., microfauna nondiagnostic. Samples not studied. 3090-3100 3100-3110 3110-3120 3120-3130 3130-3380 3380-3390 3390-3400 3400-3410 Atkinson Formation. Upper Member. Shale, sandy and mariy fragments of Ostrea sp .; fragmen_ts of white, fine to medium-grained, calcareous sandstone, containing fragments of Ostrea sp., phosphatic bone fragments, and a trace of glauconite. Shale, grayish-green, flaky; abundant fragments of sandstone, like sample at 3090-3100 ft., containing glauconitic and phosphatic material, and many fragments of shells. Sample not studied. Sandstone, shell fragments, and cavings from higher levels; a little grayish-green flaky shale. Samples in this interval are composed of fragments of sandstone like the samples below 3090 ft.; cavings of shale from higher levels; fragments of grayish-green shale; ~ragments of shells of macrofossils; and a few nondiagnostic specimens of ~ora minifera that are probably caving. The white-speckled appear- ance of some fragments of the grayish-green shale is due to the high content of comminuted tests of microfossils. A few frag- ments of lignite are usually present in the samples. The quantity of sandstone fragments decreases progressively with depth, and the samples in the lower part of . the interval are composed mainly, of grayish-green sl!ale, -fine~grained sand and a dew cavings from _higher levels. ' . Shale, green,- sandy (fine-grained sand), and a mixture of material caving from higher levels. Fragments of light greenish-gray, very finely granular limestone containing broken shells of macrofossils are probably from the strata penetrated near this depth. Fragments of the green shale contain a f ew specimens of Planulina eaglefmdensis. Atkinson Formation. Lower Member. Like the sample at 3380-3390 ft.; a few fragments of green, flaky, wa~y, highly micaceous shale, and a little greenish-gray fo~sili ferous limestone. Shale, grayish-green, and sand; a little green, micaceous shale. : 36 Depth (feet) 3410-3430 3430-3440 3440-3460 3460-3470 3470-3480 3480-3490 3490-3500 3500-3543 3543-3556 3556-3560 3560-3570 3570-3620 GEORGIA GEOLOGICAL SURVEY BULLETIN 74 Description Samples not studied. Shale, grayish-green. Samples not studied: Shale, grayish-green, containing 'a few specimens of A'mmctium m:aunsteini (an arenaceous species characteristic of the lower member of the Atkinson Formation). ' Shale, grayish-green, containing specimens of Ammobaculoides plummerae. Shale, some fragments of which are microfossiliferous; a few fragments of cream pyritic limestone containing broken shells of macrofossils. Shale, dark greenish-gray, containing a few qwarf specimens of Foraminifera, and a few specimens of arenaceous species characteristic of the lower member of the Atkinson Formation. No change. Core 3. Recovery 10 ft. Top. Sandstone, light-gray, soft, medium-grained, highly glauconitic, somewhat-- micaceous. Middle. Like the top sample, but slightly finer grained. Bottom. Sandstone, soft, medium t0 coarse-grained; loosely cemented. No sample. Shale, greenish-gray, and a little sandstone and unconsolidated sand. No change. Comanche Series undifferentiated 3620-3630 Shale, like the sampl.e at 3560-3570 ft., and a little unconsolidated sand containing a few coarse .grains; also, dull grayish-brown, waxy, somewhat carbonaceous and sandy (fine-grained sand) shale containing nodules of siderite. 3630-3640 Like the sample at 3620-3.630, but without the coarse grains of sand and showing an increase in the grayish-brown shale. 3640-3660 No change. 3660-3670 Sand, unconsolidated, coarse to very coarse, quartz, containing a few pink-tinted and yellow-tinted grains, a little feldspar, and a little colorless mica. 3670-3750 No change.. 3750-3760 Sand, like the sample at 3660-3670 ft., and a few fragments of dark-red, waxy, finely micaceous shale. 3760-3850 T.D. Sand, mainly coarse-grained quartz, containing some feldspar. At 3840-3845 ft. the samples show a few fragments of purplishred, silty shale. ... --4?4 .... LOGS OF SELECTED WELLS IN THE COASTAL PLAIN OF GEORGIA 37 CALHOUN COUNTY Operator: Sowega Minerals Explora- GGS. No 192 tion Co., Inc. Landowner: J. W. West Well #1 Elevation: 345 ft. Location: Land District 4, Land Lot Total depth : 5265 ft. 328; 200 ft. north of south line and Completed: Jan. 13, 1950 200 ft. east of west line of Land .Lot_ 328. . Summary of Stratigraphy Tertiary D epth (feet) Samples not studied Cretaceous Gulf Beds of Navarro age______________ ____~~---------- I 560 1 Beds of Taylor age____,~----.----- ---------- . 970 ~~ds Of Austin age~-~-------------------~------~--- 1420 Atkinson Formation; upper member________________________ 2100 - do lower member_ _______ _______ 2650 Comanche undifferentiated ---------------~- 2920 Thickness (feet) 410 450 680 550 270 930? Triassic (? ) , UpperTriassic (?). Newark .(?) Group c)astic .rocks ------------.,----------------------- 3850 ? 1340? diabase -~-------------------~-~--------------------------------- 5190 75 . . .. . ' . . , to total depth Lithologic and paleontologic description ~ of cut-. tings and cores. Samples are cuttings unless otherwise- stated. Dept!{ (feet) (,o. 0- 770 . Description Samples not studied by E. R. Applii\. 560- 600 -r \ Cretacegus Gulf Series Beds of Navarro age "S~nd: fine to coarse-grained, angular grains. May represent basal Clayton Formation."1 1 Herrick, S .M . 1961, Ga. Geol. Survey B u ll. 70, p . 57. 38 GEORGIA GEOLOGICAL SURVEY BULLETIN 74 Depth (feet) Description 600- 770 "Marl: gray, silty, micaceous, glauconitic, fossiliferous (macroshells, ostracodes, and Foraminifera); xxx, Anomalina pseudopapillosa at 680-690."2 This fossil is classified by E. R. Applin as Navarro age. .770- 780 Description of samples .by E. R. Applin begins at this depth. Sand, fine to coarse-grained, quartz; fragments of white limestone and a little glauconite, probably caving from higher levels; fragments of light-gray, sandy, (fine-grained sand), chalky clay, probably the material being drilled at this depth. Specimens of A nomalina pseudopapillosa present. 780- 790 Like sample at 770-780 ft., and a few specimens of Globigerina .;.;: cretacea. 790- 800 Sand, fine-grained, angular grains; a little coarse-grained sand; a little glauconite; and fragments of white limestone, probably all caving from higher levels. Many fragments of light-gray, highly sandy (fine-grained sand), calcareous, somewhat micaceous clay, that is probably the material bei.ng drilled at this depth. Sample contains a few small fragments of Inoceramus and other fossil bivalves; specimens of several species of ostracodes; and specimens of species of Foraminifera that are typical of the upper part of the beds of Navarro age: Anomalina. pseudopapillooa (fairly common), Globotruncana cretacea (small specimens), Robulus navarroensis, and Gaudryinella pseudoserrata. 1 800- 810 Sample not studied. 820- 860 Like sample at 790-800 ft.; a few phosphatic nodules at 820-830 ft. 860- 870 Clay, gray, highly sandy (fine-grained sand); micaceous, like sample at 790-800 ft. Sample contains a trace of glauconite, a few phosphatic nodules, and a few nodules of pyrite. Specimens of Foraminifera are like those in sample at 790-800 ft., and in addition, many specimens of Anomalina pinouis, a few specimens of Cibicides harperi and several other rotalid forms; .Globotruncana cretx( ?) age_ _______________ 2260 Salt Mountain Limestone___:_____~----- 2320 Pal~c~~e, beds~ containing .Tamesi faun~---~---~---.--- 2420 ? 60 100 435 .J bJ L Cretaceous Gulf" ~ ~, r Beds of Taylor age_________ ___________ -~~----------_:______ 2855 200 Beds of Austin age_~--------------~--------------:____:__~------------- 3055 305 Atkinson Formation, upper member_________________ 3360 248 lower member..:.....______________..-.. _ 3608 181 Comanche undifferentiated _______ _.-~---------~:__:_____ 3789 45 .. ." ~ : Ordovician1 ~ . ~ Lower Ordovician(?) quartzitic sandstone----------~- 3834 total 14 .~ depth Lithologic and paleontologic description of cut- tings and cores. Samples are cuttings unless otherwise stated. 1Bridge, Josiah, and Berdan, J . M., 1951 , U.S. 'Geol~ical Survey open file report, p _ 6, 6, and map. . ~ ,;-,;.'' 50 Depth (feet) 0-2100 2100-2120 2120-2130 2130-2140 2140-2150 2150-2160 2160-2170 2170-2180 2180-2200 2200-2210 2210-2220 2220-2230 2230-2240 2240-2260 2260-2280 2280-2300 2300-2310 GEORGlA GEOLOGICAL SURVEY BULLETIN 74 Description Samples not studied. Eocene Series In middle Eocene, undifferentiated Limestone, white, irregularly sandy (fine-grained sand) ; glauconitic, and a few fragments of light-tan chert. Sample contains a few small specimens of nondiagnostic species of Foraminifera. Like sample at 2100-2120 ft., and in addition;many fragments of light grayish-cream, highly glauconitic, sandy (fine-grained sand) limestone. Like the sample at 2120-2130 ft., but few fragme~ts of dark ghiu- conitic limestone. Limestone, white, somewhat glauconitic, and fragments of light grayish-tan chert. A few specimens of several species of Foraminifera, including a specimen of Asterigerina sp. Limestone and chert like the samples at 2100-2150 ft., but some fragments of limestone are highly glauconitic. Like sample at 2150-2160 ft., and many fragments of white, chalky, dense, cherty limestone; chert abundant. Limestone, glauconitic, many fragments of chert, and a little wh'ite ash. Limestone and chert, like sample at 2170-2180 ft. ' Limestone, slightly glauconitic, fr.agmental, porous, composed of a mass of small flagments 'of chert-cemented calcite that al;e probably derived from molds of altered fossil material. Limestone, like the sample at 2200-2210 ft., containing many inclu- sions of calcite; many moderately large irregular-shaped nogules of calcite, and a little chert. -,. Limestone, light-cream, fragmental, slightly - glauconitic; much light-tan chert. Like the sample at 2220-2230 ft., but some fragments of limestone are highly glauconitic. Limestone, fragmental, and a little chert, like the sample at 2230-2240 ft. A section of Disr:ocyclina sp. in the sample at 2240-2250 ft. Lower Eocene. Clastic beds of Wilcox(?) age. Shale, light-green, micaceous; a few fragments of limestone and a little chert like that described in the samples of the middle Eocene beds. Like the samples at 2260-2280 ft;, and many specimens of small Foraminifera; Globig erina sp., 01bulina sp., and Discorbis sp. are common. Shale, like the samples at 2260-2300 ft., and many fragments of light greenish-gray, highly glauconitic, irregularly sandy, porous limestone, streaked with thin veins of chalcedony. Limestone LOGS OF SELECTED WELLS IN THE COASTAL PLAIN OF GEORGIA 51 Depth (feet) 2310-2320 Description contains sections and small specimens of A sterocyclina sp. and a few bryozoan fragments. Shale, light-green, highly glauconitic, irregularly sandy, containing phosphatic nodules and nodules of glauconitic limestone. A few nodules contain fragments of Discocyclina sp. 2320-2340 2340-2350 2350-2380 2380-2390 2390-242_0 2420-2440 2440-2460 2460-2480 2480-2490 2;4,90-2540 2540-2550 Lower Eocene. Salt Mountain Limestone. Limestone, white, fragmental, somewhat glauconitic, that seems to be composed of worn, chalky, calcitic molds and fragments of fossils. A few specimens of Discocyclina w eaveri are present, and AsteTig erina sp. is common . Like sample at 2320-2340 ft., and many fragments of light grayishbrown, micaceous, fossiliferous chert. Limestone,. fragmental, somewhat glauconitic, composed of tests and altered fragments of macrofossils and microfossils; among the latter is Discocyclina weaveri. Limestone, finely fragmental, "somewhat sandy and glauconitic. Like the sample at 2380-2390 ft., but the sand content "of the lime- stone is between 50 and 75 percent; fine-grained, eyenly distributed glauconite is about 25 percent. The sample at 2410-2420 ft. contains a little fine-grained, calcareous, glauconitic sandstone. Paleocene Series Beds containing Tamesi fauna Clay, soft, which, when washed, leaves a moderately large residue of fine-grained, angular clear quartz sand arid a few fragments of calcareous sandstone like samp~e at 2410-2420 ft. Sample contains a few phosphatic nodules. Fairly common specimens of Foraminifera are: DaTbyella? sp., Lenticulina degolyeri, Nodosaria latejugata, and Globigerina sp. Like sample at 2420-2440, and a few specimens of other small Foraminifera. .Clay, sandy; washed residue composed of sand and a few phosphatic nodules like sample at 2420-2440 ft., fragments of calcerous, glauconitic sandstone, and specimens of small Foraminifera. Like samples at 2460-2480 ft. Microfauna contains specimens of Nodosaria latejugata, Lenticulina degolyeri, and Darbyella? sp. like sample at 2420-2440 ft.; many specimens of Globigerina triloculinoides, and Cibicides cf. C. praecu?'SO?'ius; Globorotalia acuta, G. velascoensis, and Eponides lotus are common. No change. Moderately large washed residue composed of sand like sample at 2420-2440 ft., fragments of light-green, micaceous clay shale, 52 Depth (feet) 2550-2610 2610-2620 . 2620-2630 2828 2630-2860 2860-2880 2880-2890 2890-2900 2900-2940 2940-2950 GEORGIA GEOLOGICAL SURVEY BULLETIN 74 Description and many fragments of light-gray, highly sandy (fine-grained sand), finely glauconitic limestone that is possibly nodular in en,the clay shale, Specimens of Da1byella? sp., L enticulina. degoly~ and Nodosaria latejugata very common; Globigerina sp., G. triloculinoides, and other small Foraminifera, like sample at 2480-2490, are also present. No change. Like samples at 2540-2610 ft.; also abundant fragments of white, hard, dense, slightly glauconitic limestone; and several fragments of light-gray, fragmental, porous, slightly glauconitic limestone. Sample seems to be a mixture of materials described from higher levels. Sidewall core 64. Recovery 1 in . . Clay, bluish-gray, slightly micaceous, somewhat glauconitic, highly calcareous, containing much comminuted microfossil material. Glauconite occurs as small bluish-green nodules. Microfossils are common, but are usually chalky, very small, and poorly preserved. The fauna, which is Paleocene in age, contains specimens of Cibicides _sp ., Anomalina. sp ., and Globigeriita, trilo~ ettlinoides. Cutting samples not studied. Cretaceous Gulf Series Beds of Taylor age The top of the bed~ of Taylor age is placed at 2855 ft. on the basis of electric log correlation supported by the data from samples. Chalk, white, and cavings of light-green shaly clay. Fragments of Inoceram-us wash from the chalk, and Inoceramus fragments and prisms are abundant in the sample. Specimens of Foraminifera and Ostracoda are common. Dominant" species of Foramini.fera are Dorotkia canula, Planulina. cedarkeysensis, and .Planulina dumblei. Like the samples at 2860-2880 ft,; numerous specimens of Arenob1dimina. americana., and a few ~pecimens of Kyphopy:r;a christneri. Material and fauna like the samples of chalk in the beds of Taylor age at 2860-2890 ft. Like the sample at 2890-2900 ft., but cavings of light-green clay shale are very abundant. Chalk, white, and Inoceramu s fragments about 50 percent of washed sample; cavings of light-green clay shale about 50 percent of washed sample. Foraminiferal fauna contains species listed in samples at 28602880 ft. and 2880-2890 ft. LOGS OF SELECTED WELLS IN THE COASTAL PLAIN OF GEORGIA 53 Depth (feet) 2950-2960 2960-3000 3000-3010 3010-3060 3060-3070 3070-3080 3080-3090 ' 3090-3120 3120-3130 Description Chalk, white, soft. The small washed residue of this sample is composed mainly, of Inoceramus prisms and fragments, and many specimens of Foraminifera. Globointncana sp., Globigerina cretacea, and Gumbelina -sp. are the most common species; Kyphopyxa christneri, Pseud&gaudryinella capitosa, Robulus spp., and Marginulina spp. are also common. A few specimens of Globorotalites umbilicatus, Eouvigerina americana, Heterostomella austiniana, and Planulina austinia.na are present. On the basis of the microfauna, the age of the containing beds is classified as early Taylor or late Austin. No change. Limestone, light-gray, chalky, and nodules of pyrite. The small washed residue contains fragments of Inoceramus and Ostrealike bivalves, and a foraminiferal fauna similar 'to that in the sample at 2950-2960 ft. No change. Beds of Austin age The top of 'the beds of Austin age is placed at 3055 ft. on the .basis of electric log correlation supported by the data from samples. . Limestone, white, hard, chalky, containing much comminuted, calcitized fossil debris. Fragments of the limestone show masses of Olig.ostegina that are common in the beds of Austin age. Fragments of Inoceramus and shells of other fossil bivalves are common. The microfossil material is usually poorly preserved, and no species having a narrowly. restricted vertical range were identified. Limestone, like the sample at 3060-3070 ft., and a little gray marl. .The sample contains many fragments of Inoceramus and shells of other fossil bivalves; the microfossil material is like that in the sample at 3060-3070 ft. Marl, gray; many fragments of In,ocerri.mus; a few fragments of moderately hard, white, limestone, like 'the sample at 3060-3070 ft.; abundant nodules of pyrite.- The foraminiferal fauna is composed, largely, of specimens of Globigerina cf. G. cretacea, and Gumbelina cf. G. moremani; specimens of Valvulineria sp. and Planulina austiniana are common; .a few specimens of Globotruncana sp. and Dorothia. cf. D. alexanderi (often common in the lower part of the beds of Austin age) are present. Specimens of ostracodes and a few specimens of arenaceous species of Foraminifera also occur in the sample. No change. Shale, gray, marly, and harder than in the sample at 3080-3090 ft. The microfauna is composed almost entirely of specimens of Globigerina sp. and Giimbelina reussi, and a few specimens of Planulina cf. P eaglcfordeWJis and Globotruncana sp. Like the .sample at 3120-3130 ft. 54 Depth (feet) 3160-3170 3170-3180 3180-3210 3190 3210-3270 3233 3233 3262 3270-3310 3303 GEORGIA GEOLOGICAL SURVEY BULLETIN 74 Description Like sample at 3120-3130 ft. The microfossil specimens are larger and more abundant than in the sample at 3120-3130 ft., but Globigerina spp. and Gii.mbelina spp. are still strongly dominant in the fauna; Globot1-uncana spp. are somewhat more common; fragments of Citharina texana are very common. C. texana is common near the base of the Mooreville chalk of Austin age at the outcrop in Alabama, and one of the species of Globotruncana is also common in the lower part of the Austin chalk. Like the sample at 3160-3170 ft.; Citharina texana is much less abundant. Material and fauna like the preceding samples of the beds of Austin age are mixed with cavings from much higher levels. Side wall core 65. Recovery 1-3/4 in. Shale, greenish-gray, flaky, marly, slightly micaceous, containing Inoceramus fragments, a few fragments of fish bones, and abundant specimens of Globigerina cf. G. C1etacea, Gumbelina reussi, Globotruncana spp. (including an undescribed form characteristic of the beds of Austin age), and Anomalina sp. (small). Shale, gray, marly, and fauna like the sidewall core 65 at 3190 ft. Side wall core 66. Recovery 1-1/4 in. Marl, light bluish-gray, chalky, containing abundant fragments of Inoceramu s and shells of other fossil bivalves, and many specimens of Foraminifera like those in sidewall core 65 at 3190 ft. Also, specimens of N eobulimina canadensis, Palmula suturalis, Palmula pilulata, and Valvulineria infrequens. Specimens of ostracodes are common: Cythere cornu ta var. and Cytherella sp. Sidewall core 67. Recovery 1 in. Shale, gray, marly; Inoce1amus prisms and fragments are com- mon. T)le microfauna is composed of specimens of several species of ostracodes, and specimens of Globigerina sp., Globotruncana marginata. KyphO'fYYxa ch?-istne?i, Gumb elina r eussi, Valvuli- neria infrequens (Austin var.), Nodosat'ia sp. (fragments), Planu lina austiniana, Robulus ?nunsteri, and Marginulina inconstantia?. Sidewall core 68. Recovery 1h in. Chalk, light-gray, marly, typically Austin in character; contains specimens of Oligostegina, Inoceramus fragments and ostracodes, and abundant specimens of Foraminifera: Globigerina sp., Gi.imbelina teussi, Globotruncana spp. fairly common, and a few specimens of a small Anomali?ta sp. Shale, gray, marly, and abundant fragments of dark brownish gray somewhat light-speckled and light-streaked shale. Sidewall core 69. Recovery 1 in. Marl, gray, streaked and speckled with white_ chalk, highly microfossiliferous. The fauna is composed, mainly, of specimens of Globigerina sp., Gumb elina reussi, Globot1-uncana area, Planu- LOGS OF SELECTED WELLS IN THE COASTAL PLAIN OF GEORGIA 55 Depth (feet) 3310-3320 3316 3320-3330 3324 3330-3350 3335 3350-3360 Description lina t exana, and Pleur.ostomella watersi. No samples. Sidewall core 70. Recovery 1/4 in. Chalk, white, marly; fauna like sidewall core 69 at 3303 ft. No samples. Sidewall core 71. Recovery 1 in. Shale, greenish-gray, marly, sandy (fine-grained sand), glauconitic, micaceous, containing phosphatic nodules. The fauna is composed of fragments of fish bones, Inoc eramus, and other fossil bivalves, specimens of several species of .ostracodes, and specimens of Foraminifera: Globigerina spp. Gumbelina reussi, Gumbelina m oremani, Glob otruncana a1ca var., Planulina texana, Palmu la pilu lata, Marginu lina austiniana. Shale, gray, and .some speckled shale; no change in fauna. Sidewall core 72. Recovery 1'4 in. Shale, gray, marly, highly microfossiliferous. The fauna is composed of fragments of Inoceramus and fish bones, specimens of ostracodes, and specimens of .Foraminifera; Globigerina sp., Globotruncana mca, var., Globorotalia C'ushmani? , Guembelina reussi, Gumb clina moremani, Maiginu lina au stiniana, Planu lina t exana ?. Material and fauna like samples at 3330-3350 feet; also many fragments of white, moderately coarse grained, clear quartz sandstone, containing many phosphatic nodules, nodules of pyri,te, and worn fragments of fossil bivalves. 3360-3366 3366-3367 3367-3372 3372-3382 Atkinson Formation. Upper Member. Core 6. Recovery 8 in. Sandstone, white, dense, calcareous, quartz; contains phosphatic nodules and fragments of Ostrea-lik e bivalves. Core 7. Recovery 5 in. Sandstone, grayish-white, moderately fine gra~ned, calcareous, quartz, containing mica, glauconite; fragments of lignite and fossil bivalves. Core 8. Recovery 5 ft. Top lh ft. Sandstone, light-gray, hard, d~nse, micaceous, somewhat fossiliferous, containing fragments of fossil bivalves. Middle 2 ft. Sandstone, light greenish-gray, soft, fine-grained, argillaceous, micaceous, containing small, black, phosphatic nodules, and thin lenses of gl'ay and greenish-gray flaky shale. Bottom 2% ft. Sandstone, soft, like middle 2 ft., but the sand grains are slightly coarser. The sandstone contains inegular thin lenses of gray and greenish-gray; somewhat sandy and micaceous shale. Core 9. Recovery 10 ft. Top 4 ft. Siltstone and sandstone, greenish-gray, soft, fine- 56 Depth (feet) 3382-3392. 3392-3401 3401-3411 3411-3421 GEORGIA GEOLOGICAL SURVEY BULLETIN 74 Description grained, .argillaceous, micaceous, glauconitic, pyritic, containing a few lenses of greenish-gray, flaky, sandy (fine-grained sand), micaceous shale. Middle 3 ft. Shale, grayish-green, thinly laminated, and white, highly micaceous siltstone, containing a few fragments of carbonaceous material and a few nodules of pyrite. Parts of the core are predominantly shale that is micaceous, irregularly silty, and somewhat carbonaceous. Bottom 3 ft. Sandstone containing lenses of shale. The sandstone is white, dense, fine to moderately fine grained, angular, clear quartz, containing many phosphatic nodules and a few shell fragments. The shale is greenish-gray to green, usually micaceous and somewhat carbonaceous. Core 10. Recovery 7 ft. . Top 5 ft. Shale, grayish-green, irregularly silty, micaceous, somewhat carbonaceous, containing lenses of light-gray mica- ceous, containing lenses of light-gray micaceous siltstone, and specimens of a small Globigerina sp., Gumbelina moremani, Gumbelina reussi, and Planulina eaglef(rrdensis. A few thin lenses of hard sandstone occur in the shale. Bottom 2 ft. Sandstone, light greenish-gray, fine-grained, micaceous, argillaceous, slightly glauconitic; contains carbonaceous material and fossil bivalves. Core 11. Recovery 4% ft. Top. Shale, light-gray, slightly micaceous, containing a few lenses of soft, fine-grained, micaceous sandstone. Middle. Sandstone, white, dense, hard, somewhat glauconitic, containing a few phosphatic nodules and many fragments of fossil bivalves. Bottom 1% ft. Shale, grayish-green, and moderately fine-grained quartz sandstone containing phosphatic nodules. Core 12. Recovery 7 ft. Top 1% ft. Shale, greenish-gray, and a little white, dense, moderately fine-grained sandstone containing many worn and broken fragments of Ostrea sp., bryozoan fragments, and phosphatic nodules. Middle 2% ft. Shale, light grayish-green, irregularly silty, micacaceous, containing irregularly distributed soft, micaceous, slightly glauconitic siltstone. Bottom 3 ft. Shale, light greenish-gray, silty, micaceous, carbonaceous, containing many phosphatic nodules, a little glauconite, many small fragments of Os.trea sp., and a few specimens of Ostracodes. Core 13. Recovery 2% ft. Sandstone, light greenish-gray, soft, argillaceous, micaceous, glauconitic, containing a few shell fragments and phosphatic nodules. LOGS OF SELECTED WELLS IN THE COASTAL PLAIN OF GEORGIA 57 Depth (feet) 3421-3430 3430-3440 3440-345.0. 3450-3460 3460-3470 3470-3480 3480-3488 3488-3498 Description Core 14. Recovery 4ft. Top 2 ft. sandstone, light greenish-gray, argillaceous, highly micaceous and glauconitic; contains phosphatic nodules and fragments of fossil bivalves. Bottom 2 ft. shale, grayish-green, somewhat micaceous, containing scattered grains of sand, fish bones, and a trace of glauconite. Core 15. Recovery 8 ft. Top 5 ft. Sandstone, argillaceous, fine to moderately fine grained, micaceous, glauconitic; contains fragments and molds of fossil bivalves, and some fragments of phosphatlze.d bones. Bottom 3 ft. Sandstone, light-green, soft, argillaceous glauconitic; contains a few shell fragments and small phosphatic fragments. Core 16. Recovery 7 ft. No change. Core 17. Recovery 9 ft; Top. Sand, like core 16 at 3430-3440 ft., containing thin, irregu- lar lenses and splotches of grayish-green shale. The material is slightly glauconitic, phosphatic, and fossiliferous (fragments of Ostrea sp.). Middle. Like the top part of the core, but more glauconitic. Bottom. Like the middle part of. the core. Core 18. Recovery 2 ft. . -No change. .., Core 19. Recovery 1lh ft. .Top. Sandstone, white, hard, and green, soft, sandy clay. The sandstone. is dense, fine to moderately fine grained, calcareous, and contains abundant fragments of white, chalky, shell fragments and_many nodules .of .glauconite and phosphatic material. _T~e green clay is highly sandy and contains a few shell fragments. BottOm. Sandstone, lightgray, dense, containing shell fragments and nodules of both glauconite and phosphatic material. Core 20. Recovery 3 ft. Top. Sandstone, greenish-gray, glauconitic, phosphatic, like core 19 at 3470-3480 ft., and lenses of thinly flaky green shale. The . sandstone contains shell fragments. Bottom. Shale, grayish-green, flaky, intei'laminated with lightgray,"soft, very fine grained, argillaceous, micaceous, phosphatic, glauconitic sandstone. Core 21. Recovery % ft. . Sandstone, light greenish-gray, very fine grained, in part dense, and in part argillaceous; contains mica, shell fragments, phosphatic nodul~s,- and many irregular-shaped, gray nodules of calcitic limestone. 58 GEORGIA GEOLOGICAL SURVEY BULLETIN 74 Depth (feet) Description 3498-3508 Core 22. Recovery 4lh ft. Top. Sandstone, light grayish-green, shaly, micaceous, and lenses of dark g1ayish-green, thinly flaky shale; contains a fe>v shell fragments, phosphatic nodules, and a little glauconite. Middle. Shale, green, micaceous. Bottom. Shale, like middle part of core, irregulax:ly streaked with micaceous, pyritic, slightly carbonaceous siltstone; contains a few specimens of Ostracodes. 3508-3518 Core 23. Recovery 7 1.6 ft. Top. Shale, like the middle and bottom parts of core 22 at 3498-3508 ft., containing many sandy areas. Fauna consists of a few fragmentary fish bones and a few small specimens of Globigerina cf. G. cretacea. Middle. Sandstone, light greenish-gray, moderately soft, micaceous, somewhat phosphatic, and containing brown carbonaceous fragments; a few lenses of flaky green shale in the sandstone. Bottom. Shale, green, irregularly sandy (fine-grained sand), micaceous, carbonaceous. 3518-3528 Core 24. Recovery 7 ft. Top 3 ft. Shale, like bottom part of core 23 at 3508-3518 ft. ..,.. .. ~ Part of this section of core 24 is sandy, (coarse-grained sand), and contains many phosphatic nodules, nodules of pyrite, and fra-gments of Ost1ea sp. Middle 3 ft. Sandstone, light greenish-gray, soft, argillaceous, micaceous, glauconitic, pyritic, and a few thin, irregular lenses of green shale. Bottom 1 ft. Sandstone, light greenish-gray, fine-grained, argil- laceous, micaceous; contains a few fragments of carbonaceous material, phosphatic nodules and Ostrea sp. 3528-3538 Core 25. Recovery 7 ft. Top. Sandstone, fine to moderately fine grained, slightly glauconitic, phosphatic, and pyritic, irregularly interbedded with green, micaceous, somewhat carbonaceous shale that occurs in lenses of variable thickness. Middle. Like top of this core. Bottom. Sandstone, white, hard to moderately hard, fine to moderately coarse grained, containing a few phosphatic nodules, a few nodules of glauconite, and chalky fragments of fossil bivalves. 3538-3548 Core 26. Recovery 3 ft. 8 in. Top 30 in. Sandstone, light greenish-gray, soft, glauconitic, micaceous, somewhat carbonaceous, containing a few inclusions and thin lenses of shale. Middle. 6 in. Sandstone, soft, argillaceous, somewhat glau~onitic, micaceous, and carbonaceous, irregularly interlaminated with shale and siltstone. ,. LOGS OF SELECTED WELLS IN .THE COASTAL PLAIN OF GEORGIA 59 Depth (feet) 3548-3558 3558-3560 3560-3570 ": 3570-3578 3578-3588 Description Bottom 8 in. Sandstone, light greenish-gray, argillaceous, mica~ ceous, containing many fragments of lignite, a little phosphatic material, and a few fragments of glauco~ite-coated shells. Core 27. Recovery 6lh ft. Top lh ft. Sandstone like bottom of core 26 at 3538-3548 ft., and irregular thin lenses of shale. 2nd 1 ft. Sandstone, light-gray, moderately hard, argillaceous, containing many shell fragments and black, phosphatic nodules, a little glauconite and mica, and a few thin irregular lenses of green shale. 3d 1 ft. Like the second foot, but containing a few rather large fragments of lignite. 4th 1ft. Sandstone, light greenish-gray, soft, micaceous, contaiii'ing a .few shell fragments and thin lenses of shale. 5th 1% ft. Sandstone, light greenish-gray; soft, argillaceous micaceous, containing a few shell fragments, phosphatic nodules and a little carbonaceous material. 6th 1% ft. No sample? Core 28. Recovery 2.! ft. Top. Sandstone, light-gray, moderately hard, argillaceous, containing irregular laminae of. green shale. The sandstone is micaceous, slightly glauconitic and carbonaceous, and contains a little magnetite and a few shell fragments. Bottom. . Like the top part of the core, but softer and contains phosphatic material. Core 29. Recovery 7 ft. ! Top 2 ft. Shale, greenish-gray, micaceous, silty, containing . abundant fragments of Ostrea ap.; small fragments of carbo- ; naceous material are fairly common. Bottom 5 ft. Sa.ndstone, grayish-green, fine-grained, micaceous, irregularly streaked with shale laminae, and containing many. fragments of Ostrea sp. and a few phosphatic nodules. Core 30. Recovery 4% ft. a Top. Sandstone, light greenish-gray, soft, argillaceous, glauco- nitic, micaceous, containing fewshell fragments and thin lenses of grayish-green flaky shale. Bottom. Sandstone similar to the top part of the core, containing small carbonaceous fragments and irregular thin streaks of shale~ Core 31. Recovery 6% ft. ') Top 2 ft. Like the bottom of core 30 at 3570-3578 ft., but frag- ments of lignite and small fragments of carbonaceous material are abundant. Bottom 4lh ft. Sandstone, light-gray, moderately hard, calcareous, micaceous, containing . abundant fragments ef Ostrea sp., many small phosphatic fragments, and a little glauconite and carbonaceous material. 6Q GEORGIA GEOLOGICAL SURVEY BULLETIN 74 Depth (feet) Description 3588.3598 ;"-, . ( ' ;..: . . ~. ,; . Core 32. Recovery 5.! ft. Top 1.! ft. Sandstone, lig~t greenish-gray, shaly and highly sandy clay shale. Parts of the core are white, hard, nodular, sandy (very fine grained sand) limestone, in which shell frag. ments and small phosphatic nodules are common. Middle 3 ft. Sandstone, light greenish-gray, hard, and a few irregular lenses of green, micaceous silt. Thfi! sandstone is glauconitic and contains many fragments ,of fossil bivalves and gastropods, and a few fragments of lignite. Bottom 1 ft. Sandstone like middle part of core, and lenses of grayish-green, micaceous shale that is usually silty and in places highly carbonaceous. 3598-3608 Core 33. Recovery 5% ft. ,. Top 2ft. Shale, grayish-green flaky, containing lenses composed . ( . .~. ' .; ' '1 . of mica and moderately small fragments of lignite. Midma.JI particies of carbona~eous material. 62 GEORGIA GEOLOGICAL SURVEY BULLETIN 74 Depth (feet) Description 3689-3699 . Bottom. Like the middle part of this core:- Core 43. Recovery 10 ft. .. , Top. Shale, greenish-gray, containing fragments of casts and molds of small thin-shelled bivalves, and a few thin, silty; micaceous and somewhat carbonaceous streaks and lenses. Bottom. Like the top part of this core, but niore silty, micaceous, and carbonaceous. 3699-3709 '~ . Core 44. Recovery 10 ft. at 'Top 2 ft. Like the bottom part of core 43 3689-3699 ft.; con- a tains few fish bones and fish teeth, a f~w specimens of Ostra- codes, and many specimens of Fo1aminifera . The common spe- cies of Foraminifera are: Ammobaculites comprima.tus and Globigerina sp. 2nd 2 ft. Like the top 2 ft. of this core. 3d 3 ft. Shale like the preceding parts .of this core, and many < ' ~ thin, highly sandy (very fine-grained sand) micaceous lenses. Bottom 3 ft. Shale like the precedi]\g parts of this core, contain- ing specimens of Ammoba.ciilites comprimciti'c.S and a few speci- mens of Ammotium brat,nsteini. 3709-3719 Core 45. Recovery 10 ft. Top 3 ft. Shale, gray, thinly bedded, somewhat carJ>onaceous, sandy (fine-grained sand), micaceou.s. Contains many shell fragments, and specimens of Foraminifera and Ostracoda. Dominant species of Foraminifera are: A mmoba.culites advenus, Ammoba.culites ag1estis, Ammoba.culoides. plumme?a.e, Reophax sp., . Placopsilina sp., Pseudoclavulina. sp., . Polyphragma. sp., Citharina kochii, Anomalina 'plummeme, Frondicula.ria. cf. F. inversa, Globige1-ina sp.; .Dentalina sp., Quinqueloculina lirel. langula, Triloimlina sp. Common species of ostracodes are: Cythereis burlesonimsis, Cythere concentrica, Cythe?eloides obliquiruga.ta., Cytherella sp., Cyth e1ideApplin, E. R., 1956, U.S. Geological Sur vey, Professional Paper 264-I, p. 1S7-197, pis. 48, 49. LOGS OF SELECTED WELLS IN THE COASTAL PLAIN OF GEORGIA 63 Depth (feet) Description (.. .. venus, Globigerina sp:, and Cytheridea graysonensis. Bottom 3 ft. Shale, gray, containing small particles of carbonaceous material, and thin lenses of light-gray, very fine grained, micaceous, pyritic, slightly gla~conitic sandstone. 3729-3739 Core 47. Recovery 9 ft. Top 2 ft. Shale, gray, flaky, micaceous: 2nd 2 ft. Shale, gray, flaky, containing thin, .sHty, micaceous, slightly.glauconitic lenses. 3d 2 ft. Sandstone, gray, argillaceous, m.icaceous, gl.auc,o~itic1 somewhat phosphatic. Sand grains are poorly sorted, fine to very coarse (pebble-size). 3739-37.49 Bottom 3 ft. Like the preceding part of thi_s core. . .- ~ .r. , : ' Core 48. Recovery 10 ft. Top 3ft. Sandstone, light greenish-gray, argillaceous, micaceous, glauconitic sandstone, like the lower pa1t of core 47 at 3729-3739 ft., and a few thin lenses of highly micaceous, flaky shale. 2nd 3 ft. Sandstone like the preceding part of this core; also a little soft, argillaceous, glauconitic, slightly micaceous sandstone. 3d 3 ft. Sandstone, light greenish-gray, soft, fine to moderately fine-grained, argillaceous, glauconitic,. slightly micaceous. ~. Bottom I ft. Shale, gray, thinly flaky, micaceous, containing thin irregular, sandy (very fine-grained sand), glauconitic, mi- caceous streaks and lenses. ' ,.' Core 49. Recovery 8 ft. .., Top. Like the bottom part of core 48 at 3739-3749 ft. Middle. Siltstone; irregularly and thinly laminated, soft, micaceous, argillaceous, and gray, flaky, somewhat glauconitic shale. . Bottom. Shale, gray, silty, micaceous, glauconitic, and fine to coarse-g1ained, glauconitic, phosphatic, argillaceous sandstone. 3759-3769 Core 50. Recovery 9 ft. Top. Shale, gray, thinly flaky, containing a .few rather evenly distributed, small fragments of lignite, and thin lenses of soft, ' very fine grained, glauconitic sand. ., Middle. Shale, greenish-gray, highly sandy (fine to coar~;~e grained sand), micaceous. Coarse to moderately coarse, we1I-rounded sand grains, are cominon. Bottom. Like ~he middle part of this core. 3769-3779 Core 51. Recovery 4 ft. Top. Sandstone, light-gray, soft, fine to coarse-grained, argillaceous, glauconitic, so~ewhat micaceous; moderately fine grains are common. Bottom. Sandstone, light greenish-gray, soft, mostly fine-grained, argillaceous, micaceous, glauconitic. 3779-3788 Core 52. Recovery 3 ft. Top. Like the bottom part of core .51 at 3769-3779 ft. The sand- 64 GEORGIA GEOLOGICAL SURVEY BULLETIN 74 Depth (feet) Description -~. ~! I ' stone is mainly fine-grained, but coarse grains are fairly common. Bottom. Shaie, light bluish-green and reddish-brown mottled, . highly micaceous, unctuous. . (:ornanche Series; undifferentiated .3'788~3793~ ' The top of the Comanche Series is placed at 3789 ft. on the basis of electric log correlation in connection with the data from samples. Core 53. Recovery 4 ft. '1: Shale, mottled light-green, yellowish-brown, light purplish-gray, micaceous, unctuous. 3793-3803 Core 54. Recovery 9 ft. Shale, mottled, dull brownish-red, green, mustard, bluish-gray, and lavender, somewhat.micaceous, unctuous. 3803-3812 ' Core 55. Recovery 9 ft. .. Top 3 ft. Clay, mottled, light-yellowish-green and purple, highly sandy, unctuous. The sand grains are fine to very coarse, rounded to subrounded, and etched; many grains show an orange tint. Middle 3 ft. Clay, mottled, light-g.reen, -purple, and yellow, unctuous, slightly sandy. Nodules lylepidina) antillea, and many spe.cimens of smaller Foraminifera and ostracode!>. 1310-1325 No samples. i325-1370 Limestone, light-cream, porous, chalky, probably a water-worn, altered ' coquina shoWing only traces of fossil. molds. About 50 percent of sample is grayish-brown moderately finely crystalline dolomite, and a little light-gray chert. A trace of selenite is present in some of the chips of' dolomite. Fragments. of Astero- cyclina asterisca (an upper Eocene form) in sample at 1350-1360 ft. is probably caving. LOGS OF SELECTED WELLS IN THE COASTAL PLAIN OF GEORGIA 77 Depth (feet) Description 1370-1'410 ..> Limestone, white moderately hard, chalky, shoWing traces of fossil structure and ornamentation. Some limestone fragments are glauconi~ic. Washed concentrate contains .worn fragments of larger: Foraminifera, and a few."fragments: of dolomite and chert. 1410-1440 -. . . Limestone, white>to light-creani, moderately hard, porous, chalky, containing . abundant fragments of specimens of Pseudophragmina (P1oporocyclina) teres, Lepidocyclina (Polylepidina) antillea, Amph;istegina lopeztrig.oi, an~ many bryozoan fragments .. 1440-1460 Limestone, cr~am,..moderately h!ird, porous, coquinoid, somewhat glauconiticand dolomitic, containing abundant broken and worn . specime~s of a number of species and genera of Bryozoa. 1460-1500 :,) Limestone, cream, chalky, glauconitic, dolomitic, containing many . ., bryozoan fragments, fragments of fossil bivalves .and other.fossi1 . i , debris. The glauconite is dark green, .and .occurs as smal(irreguiar i~clusions in depressions in the lim~stone and as partial filling for some of the fossils. 1500-1520. Limestone, ~hite coquinoid, chalky, doi~miti_c, glau~onitic, con~~iri ' il{g abundant sp~'Cimens of Operculinoides gra;,;elii Cole, bryozoan frag~~nts,' ;and other undeterminable 'fossil. debris. l520-1570 J' .No samples. . . . . : ~ 1570-16'40 Coquina, 50. percent of.. sample; composed of worn and fragmental which limestone molds of small specimens of Foraminifera and a other fossils; 50 percent. of sample is fine-grained qu~rtzitic ..... sand containing few phoSphate nodules and fragments of dolo- oi white limestone tnolds of small. speci:mens Foraminifera and J. a fragruental fossil material. 1640-1~7Q. Sand, fine _tp medium~grained, subangular, clear quartz, containing a few black phosphatic nodules, is about 90 percent of sample. Fragmental fossil material is abqut 1P perc~nt of sample. In -"' . '.:I .the sample~ at l650-1670, the sand filtd the .fossil molds each 3 t; ( compose aboilt"!5~ percent of "tp.e-' ~uttings. . . 1670~1680 Limestone, 'white, kdder~tely hard, c6quinoid, containing abundant , specimens of a, stron.gly beaded tumid .Camerina? sp., and of . Discocyclina (Aster_dcyclina) monticellensis Cole and Ponton. "~ ~:Other fragmimtal fossil 'm~terial is .pres~nt but unidentifiable. .... ' ... I I~ ...... , :.. ~ '' ., , Lower Eocene. Beds :of. Wilcox age, 1680-1690 Lithestone,i chalky; dolomiti~~ glauconitic, containing a trace of -~ ,." fragme~tai f~ssil material and light-gray .chert. Note . This material is similar to some iri higher samples and may be out of place. . Top of low~r Eocene is based, in part, on electric log characteristics of the Ballard well. 1690-1700 . ' Limestone, chalky, doiomitic, fossiliferous containing fragments of light-gray chert and. specimens of Asterocyclina monticellensis Cole and Ponton, (probably caving); Discocyclina weaveri (char- < acteristic of .'the Salt Mountain Limestone), fragments of larg~ 78 Depth (feet) 1700-1720 1720-1750 1750-1760 1760-1770 1770-1780 1780-1800 1800-1820 1820-1870 1870-1800 1880-1900 1900-1930 1930~_1980 1980-2020 GEORGIA GEOLOGICAL SURVEY BULLETIN 74 Description echinoid spines, and other fossil material. Robulus cf. R. midw.ayensis occurred in one fragment of limestone. Sand, very fine to coarse. Sand, like preceding sample, and a:b.out 50 percent small fragments of fossil -mateiial composed of white chalky limestone. Small black phosphatic nodules occur at 1740-1750 feet. No sample. Sand, very fine to coarse-grained, subangular, clear quartz, and some nodular fragments of white, hard, glauconitic, sandy limestone composed of broken and fragmental molds of fossils. Sand as in the preceding sample, about 80 percent; about 20 per- cent white sandy limestone molds of fossil fragments. ' Like the preceding .sample with the addition of many fragments of limestone similar to that in sample at 1760-1770 feet. No samples. t "Sand, fine to veiy coarse,. subangular, clear quartz; abundant gray and some white fragments of Ostrea-iike bivalves that have been finely broken and worn; small nodules composed of white . chalky limestone, fossil frag~ents, and glauconite. At 1,850-1860 feet, sample contains fragments of .several" species of Bryozoa and some fragments of Camerina sp. L . ' Sand, fine to ve1~y : coarse, clear quartz, containing large black nodules of phosphate, constitutes most of sample. A smaller part of sample is composed of fragments of a coquinoid lime- stone, part of whichare gray, sandy and glauconitic, and part are white, porous, glauconitic and fossiliferous. A few worn specimens of Pseudophr"agmina (?) sp. are apparently indigeil()m5. ~o samples. Sand, fine to very coarse, silbangular, clear quartz. Sample con- tains ~ few specimens. of Discocyclina weaveri and small fragment~ of other fossils like tho~e de~cribed from higher levels in the lower Eocene. " Sand, like preceding s~mple; and abundant gray and white, sandy, somewhat glauconitic fragments of Ostrea, other fossil bivalves, and unidentified fossil materiaL Sand, fine to very coarse, subangular, clear, quartz, containing a few phosph~tic nodules, and many fragments of white, glau~ .conitic, sandy, fossiliferous limestone; fragments of gr.ay and whit~, sandy, glauconitic, badly worn, fossil bivalves; pink- stained, sandy, glauconitic, porous, fossiliferous limestone; and other fossil debris. So~e of the material is probably caving. Paleocene Series Beds of Midway Age 2020-2040 Lithology and fauna like the preceding sample, with the addition _ ' OF LOGS OF SELECTED WELLS IN THE COASTAL PLAIN GEORGIA 79 Depth (feet) 2040-2060 2060-2070 2070-2090 2090-2120 2120-2130 2130-2150 2150-2i80 2180-2200 2200-2250 2250-2260 2260-2300 2300-2330 2330-2380 Description of many fragments of fine-grained, highly glauconitic dolomite. A few fragments contain selenite inclusions and a few are chalky. Some fragments of dolomite are sandy. No samples. Sand, fine to very coarse, subangular, clear quartz, about 50 percent of sample; about 50 percent white, glauconitic, sandy limestone that contains small fragments of Ostracodes aitd undeterminable fossils; Limestone, white, moderately hard, sandy, glauconitic, and some- what fossiliferous like the preceding sample. Sample contains a little sand, and a few fragments of glauconitic sand cemented with selenite. Sand, fine to very coarse grained, about 50 percent of sample; 50 percent white, moderately hard, sandy and glauconitic limestone like the preceding sample. The limestone contains fragments of microfossils and macrofossils. No sample. Limestone, light-gray, highly sandy, glauconitic; sand is moderately fine gr'ain~d and contains a trace of mica. Sa~d, fine to very coarse, and fragments of sandy limestone and wom fossils that are p-robably caving from higher levels. Sand, fine to coarse-grained, with medium-sized grains common at 2180-2200 feet; many small fragments of light-gray, very finely sandy and glauconiti'c, chalky limestone. A few small poorly-preserved specimens of Foraminifera are possibly indigenous in the _sample. Coarse grains of sand are common at 2190-2200 feet. Sand, fine to coarse-gtained, about 25 percent of sample; 75 percent gray, hard, finely sandy and glauconitic, calcareous clay, or argillaceous, calcarelack, phosphatic nodules and a few broken, polished, phosphatic nodules; a few broken and worn fragments of white and gray limestone showing traces of fos~ils.. This sample may be out of ,place.: . ' Sand a~d clay, like the first sample described ~t 150-160 f~. Like sampl~ - ~t 160-170 ft.; sand is about 75 percent of the s~mple ; . an 10 perecnt nodules of dark-green glauconite. 1310-1320 ~ :, . Like sample at 1300-1310 ft. 1320-1340 No . change. 1340-1350 ; .i Sand, clear quartz, fine to medium-grained, and about 50 percent nodules of dark-g1een glauconite. 1350-1360 Like sample at 1340-1350 ft. Lower Eocene and middle Eocene undifferentiated 1360-1370 Like sample at 1340-1350 . ft., and in addition, a few fragments of white, chalky, glauconitic, fossiliferous limestone. 1370-1380 Clay, light greenish-gray, highly sandy (fine-grained sand), very finely glauconitic, slightly calcareous, soapy textured, containing a few sections of small chalky specimens of Foraminife~a. About /. : 'GEORGIA GEOLOGICAL SURVEY. BULLETIN 74 Depth (feet) . ' 1380-1390 139\)-1400 1400-1410 1410-1420 1420-1430 1430-14401440-1450 1450-1460 . 1460-i470 1470-1480 . 1480-1490 1490-1500 1500-1510 1510-1520 Description 75 percent of the sample. is sand and glauconite, like samples from 1260 tO 1360 ft., and small fragments of white, chalky, fos- . siliferous limestone like that in samples above the glauconitic .: sand. This sample also contains a few fragments of light-gray "'Clay that is not sandy. Like sample at 1370-1380 ft. ;No change. Sample is about 50 percent fine to coarse-grai;ned sand, and 50 percent glauconitic nodules. The sample contains a few frag- .. . ments of sandy, glauconitic clay, like the samples at 1370-1380 ft., and a few molds of echinoid spines th.at seem to be {ndigenous in the clay. Like sample at 1400~1410 ft. Like sample at .1400-1410 ft., and contahiing a few fragments of Robulus sp., presumably indigeno)lS in beds near the deptlt represented by this sample. Sand and glauconite, like many of the preceding samples, and in addition a few fragments of light-green, silty, very finely micaceous, very finely glauconitic clay: Like sample at 1430-1440 ft. Samples are much smaller than at higher levels, _suggesting that clay is penetrated at this depth, although sand and glauconite compose much of the sample. _ Sand, fine to coarse-grained, and about 5o percent fragments of light-gray, moderately hard, highly silty, finely micaceous, slightly glauconitic clay that was observed, first, in the sample at 1430:1440 ft. ' Clay, hi.ghly silty; which is perhaps better described as micaceous; glauconitic siltstone, composes about two-thirds of the cuttings in this sample; about one-third of the cuttings are fine-grained quartz sand. Like sample at 1460-1470 ft., but containing ~uch less fine-grained quartz sand. The r elatively small washed sample is composed of a .?:few fragments of soft gray clay, and many fragments of white to lightgray moderately hard limestone showing traces of :fragmental fossil debris and a few broken calcite molds of s~all gastropods. Like sample at 1480-1490 ft. Limestone, yery light gray, moderately hard, like that in the samples at 1480-1500 ft. The limestone contains faint traces of a highly fragmental fossil content, but little of the material is generically indentifiable. The fossil material consists of bryozoan fragments, fragments of- molds of small gastropods and pelecypods, and a few fragments of echinoi9s. Like sample at 1500"1510 ft. :;_ I' LOGS OF SELECTED WELLS IN THE COASTAL PLAIN OF. GEORGIA 97 Depth (feet) 1520-1530 1530-1540 1540-1550 1550-1560 1560-1570 .1570-1580 1580-1590 1590-1600 1600-1610 1610-1620 1620-1630. 1630~1640 1640-1650 1650-1660 1660-1670 1670-1680 1680-1690 Description Like sample at 1500-1510 ft., with the addition of a few fragments - of sandstone, a little fine-grained sand, and many small frag- ments of shells of fossil bivalves. Sand, quartz, fine to very coarse grai~ed, and m_any worn and broken shell fragments. The shell fragments usually have at- tached sand gi-ains, or form nodules with sand grains and calcitic cement. . . . Sand, clear quartz, fine to medium-grained, and about 20 percent shell fragments and sandy calcitic nodules, like the sample at 1530-1540 ft. Shell fragments, worn, broken, sandy, and a few limy calcite nodules are about 75 percent of the same; 25 percent of the sample is sand, like the sample at 1540-1550 ft. Shell fragments 50 percent and sand 50 percent, 'like the sample at 1550-1560 ft. Like sample at 1560-1570 ft. No change. About 75 perecnt of the washed concentrate consists of loose shell fragments, and fragments of white and gray, sandy, phosphatic coquina composed of fragmental and partly calcitized shells, molds of small bivalves, gastropods, and ostracodes, and traces of other fossil debris. Sand, . fine to medit_lm-grained, about 75 percent of sample; 25 percent is. fragments of coquina, like the sample at 1590-1600 ft. The sample contains a few phosphatic nodules, molds of ostracodes, bryozoan fragments, fragments of molds and shells of macrofossils, and a little soft, brownish-gray to greenish-gray clay. Like sa~ple at 1600-1610 ft. Sand, fine to very coarse grained, and about 10 percent shell fragments and small calcareous sandy nodules. Sand, clear quartz, fine-grained, composes most of the .sample; about 1. percent is shell fragments, sandstone nodules, and soft, gray, shaly clay. Soft clay or sandy clay is probably the material penetrated at this depth. Sand, fine to medium-grained, and about 1 percent shell fragments, sandstone fragments and fragments of gray shaly clay. Like sample at 1640-1650 ft. Sand; shell fragments, and other material caving from higher levels. This small s~mple contains a few fragments of two kinds of gray and grayish-green, soft, platy shale. Sand, clear, quartz, fine-grained, well-sorted, nodular, and a very, small amount of shell and sandstone nodules. Sand, fine t~ very coarse grained. The sample also contains a few shell fragments, nodules of sandstone and sandy limestone, a few fragments of gray clay shale, and a few small phosphatic Depth (feet) 1690-1700 1700-1710 1710~1720 1720-1730 1730-1740 1740-1750 1750-1760 1760-1770 1170-l780 1780-1790 1790-1800 1800-1810 1810-1820 1820-1830 GEORGIA GEOLOGICAL SURVEY BULLETIN 74 Description nodules. Like sample at 1680-1690 ft. No change: Sand and a few shell fragments; shell and sand nodules like those in the sample at 1680-1690 ft., and other higher samples; a few fragments of several types of soft, gray, shaly clay. Several fragments of clay contain poorly-preserved specimens of very' small Foraminifera; a fragment of a cup-coral is embedded in one fragment of sandy clay. Like sample at 1710-1720 ft. Sand and about 5 percent sandy shell fragments. The sample contains several phosphatic molds of ostracodes. A specimen of Loxoconcha cf. L. creolensis, indicative of beds of middle Eocene age, is attached to a small fragment of shell. No sample. Like sample at 1730-1740 ft. Sand, clear quartz, fine to medium-grained, angular to subangular; about 10 percent of the sample is composed of fragments of poorly-preserved shells of Ostrea(?) sp., and a few nodules of shells and sand. Sand; fine to very coarse gra.ined; a few shell fragments, and a few cavings of material from higher levels. Like sample at 1770-1780 ft., and many cavings. Sand, clear quartz, fine to medium-grained, angular to subangular; a few shell fragments and a few cavings. Sand, fine to very coarse grained, a few shell fragments and a few cavings. Like sample at 1800-1819 ft.; a small sample; cavings are common. . , Like ~ample at 1810-1820 ft. \ Paleocene Series The sampies from the three wells that are the basis for this composite log contain no faunal evidence for beds of Paleoc~ne age. 1830-1840 1840-1850 Cretaceous Gulf Series Beds of Navarro agf' Sand,. fine to medium-grained, and about 10 percent small fragments of hard, cream limestone and cavings. The sample contains a few specimens of Robulus sp., a few poorly-preserved specimens of other species of Foraminifera, and a few specimens of Ostracoda. Sand, like _sample at 1830-1840 ft., about 50 percent; about 50 ,. LOGS OF SELECTED .WELLS IN THE COASTAL PLAIN OF GEORGIA 99 Depth (feet) 1850-1860 1860-1870 1870-1880 1880-1890 1890-1900 1900-1910 1910-1920 1920-1930 1930-1940 Hl40-1950 1950-1960 1960-1970 1970-1980 1980-2000 2000-2010 Description percent light-cream, moderately soft, irregularly sandy limestone, containing. traces and few fragments of fossils. This material closely resembles the material .in samples at higher levels and may be caving. A few fragments of several types of light-gray clay are also in the sample. Sand, very fine grained and al:lout 1 percent small fragments of limestone like that in the sample at 1840-1850 ft. The sample contains a few small fragments of shell and. a little mica.. a Sand, like sample, at 1850-1860 ft., and about 5 percent mica; a few cavings from higher levels; few fragments of several types of gray clay. Like sample at 1860-1870 ft. No change. Sand and mica like sample at 1860-1870 ft., a few fragments of gray clay, and a few cavings. The sample contains a few speci- . .mens of Robulus sp. Sand, quartz, fine to coarse-grained, a few fragments of gray, soft, micaceous clay; a few fragments of materials and fossils caving from higher levels. Like sample at 1900-1910 ft. This sample contains molds of several species of ostracodes, a fragment of Nodosaria .a-/finis, a fragment of MarginuUna linea?a, and a few fragments of Robulus navarroensis. Like sample at 1910-1920 ft., and several specimens of species of smaller Foraminifera, including Robttlu.s navarroensis, Anomalinoides pinguis, Planulina cin-~ecta, Do1othia bul/etta, and Gaudryina r?.tdita. . \ s and, like .immediately preceding samples, about 5() percent; about 50 percent small fragments of several types of siltstone, clay, and sandy clay, similar to material in samples at higher levels, and all probably caving. This sample contains many specimens of Robulus sp., Ano'l'l'~alina sp. and other species of smaller Foraminifera which occurred, also, in samples beginning at 18301840 ft. Like sample at 1930-1940 ft. No change. Like sample at 1930-1940 ft., but specimens of ostracodes occur in the microfauna. No change. No change. Sand, clear qu.artz, fine to coarse-grained, subangular, composes most of the large sample. About 5 percent of the sample is composed of small fragments of .shell, and fragments of gray clay, sandy clay, siltstone, phosphatic fragments, and a few glau- ft : conite nodules. Specimens of species of Foraminifera and Ostra- coda are like those in samples beginning at 1830-1840 GEORGIA GEOLOGICAL SURVEY BULLETIN 74 Depth (feet) Description \, 1. 2010-2020 Sand, clear .quartz, fine to medium-grained, subangular; also a few fragments of clay and of fossil debris siinilar to that in the immediately preceding samples. This sample contains a few black, phosphatic fragments, a trace of glauconite, and a trace of ili'ica. 2020-2030 2030-2060 2060-2070 2070-2080 2080-2090 2090-2100 2100-2110 2110-2120 2120-2130 2130-2140 2140-2150 2150-2160 2160-2170 2170-2180 2180-2190 2190-2200 2200-2210 2210-2220 Like sample at 2010-2020 ft. No change. Sand, clear quartz, fine-grained, angular to subangular. About 1 percent of the large sample is composed of small irregularshaped nodules of very dark green glauconite, and a few brownish-black phosphatic fragments. The sample contains a few fragments of light-gray, soft clay, and a very few fragments of caved material and fossil debris. Like sample at 2060-2070 ft., but containing some very coarse grains of quartz and about 5 percent cavings. Sand, clear quartz, very fine grained, angular; composes most .of the sample. Also present are a little glauconite; phosphatic ma. terial and cavings. Like sample at 2080-2090 ft. Like sample at 2080-2090 ft., and a small amount of colorless mica. Like sample at 2100-2110 ft. Sand, clear quartz, fine to medium-grained. About 5 percent of the sample is composed of small fra~ents of shells, small' nodules of glauconite~ and a few fragments of clay, fossil debri~, and other material like that in samples at higher levels. - Like sample at 2120-2130 ft., but showing an increase in the amount of cavings. A few black phosphatic fragments are present. Sand, clear qu~rtz, fine~grained, angular. About i percent of the sample is composed of cavings, small black phosphatic fragment~, , nodules of glauconite, and mica. .- Like sample at 2140-2150 ft. .1. No marked change in material or fauna. The fauna is composed, chiefly, of specimens of a small Robulus sp., Anomalina sp., and shell fragments. No sample. Like sample at 2160-2170 ft. No change. Sand, clear quartz, very fine to coarse-grained. About 5 percent of the sample is composed of fragments of several kinds of gray clay and sandy clay, a few small fragments of shell material, a very few ..specimims of micro-fossils, a few nodules of. glau- conite, a few nodules of pyrite, and a few small fragments of phosphatic material. A few specimens of Robulus sp. are in the sample. ., Sand, like sample at 2200-2210 ft. About 20 percent of the sample -.. ....... ,.: LOGS OF SELECTED WELLS IN THE COASTAL PLAIN OF GEORGIA {01 ~" ~t":e~~ Description .... is COJ]lposed (Jf several kinds of gray and brownish-gray, soft, f micaceous, in .part silty clay; a few shell fragments; a few specimens of species of Foraminifera already mentioned in the samples beginning at 1~30-1840 ft.; a few fragments of light- a gray, soft, very fine-gra.ine ments. :.~~\: --. 2655-2660 Sand and other hlaterials like the sample at 2650-2655 ft., but ;..; coarse grains' of sand ar'e rare. 2666-2665' : ., . Lik~ sakple at 2650-2655 ft., but this sample is smaller and con- tains many specimens of ostracodes and many fragments of dark brownish-gray clay. 2665-2670 Sand, clear quartz, fine to coarse-grained, and about 10 percent worn, broken, sandy fragments .of Ostrea-like bivalves; frag- GEORGIA GEOLOGICAL SURVEY BULLETIN 74 . _;_ Depth (feet) Description 2670 2670-2720 2720-2725 ments of light-gray;moderately hard, highly sandy limestone; a few, fragments of dark brownish-gray flaky shale; a few fragments of phosphatic material; a f ew nodules of glauconite; and rare specimens of . Cretaceous species of Foraminifera, among which are specimens of Kyphopyxa christneri. Circulating. Like sample. at 2665-2670 ft. ; No samples. ;, _.; Sand, clear quartz, fine to coarse-grained, subangular, in a rela~ tively small .sample. The sample also co~tain.s about 1 percent shell fragments and a few fragments of clay and sandy .lime- stone; a little glauconite and phosphatic material; and a few specimens of Foraminifera. Worn specimens of Robulus navarroensis and Planulina correcta are fairly .common in the fauna; other specimens . are Globigerina . saratogaensis, Gaudryinella pseudoserraUJ,, ' and specimens of ostracodes. 2725-2730 Sand, fine to coarse-grained. About 50 percent of the sample is composed of fragments of .several other materials that are chief!~ fragments of dark brownish-gray, soft day shale, containing specimens of minute Foraminifera and very fhiely fragmented . fossil shells; fragments of several kinds of very sandy light-gray limestone; a few shell fragments. The sample contains a: fe:w specimens of Foraminifera that are probably, .caving. 2730-2735 Sand, shell and other materials like the .sample at 2725-2730 ft. The sample contains a few specimens of species of Foraminifera characteristic of the beds of Taylor age, among ,which are Stensioina. americana. and Planuliita .taylorensis ;.. a few specimens of ostracodes also occur. 2735-2740 Like sample at 2730-2735 ft. 2740-2750 No change. 2750-2755 A small washed sample is con:iposed chiefly of-'fine to coarse: _ grairied quartz sand. The sample contains cuttings of sligh~ly glauconiti-c, sandy {fine-grained sand) limestone (or calcareous, fine-grained sandstone), and cuttings of sandy limestone in which fragments of Inoceramus are embedded. .The limes.top~ ( ?)1 ,, . , may, in fact, be calcareous nodules in sandy . clay. A ~~.w. sheli .. . - fragments and a few . nodu~~.s of glauconite also occu~ in. ih.e 2755-2760 . ' s.ample: 1 , . , .: .. . .. 1 !: Sand, .fine ..to coarse-grained composes the . largest part of the sample. The sample contains about 5 percent. nodules of dark- greeil' glauconite, and in addition, a few shell fragments and a fe~ specimens of Foraminifera. The fos~ils'iue, in part; Creta:. taceous species (Globi{/ erina sp.) and, in p~rt, 'caving from pos~~ Cretaceous beds. ' ' .. ' ' 2760-2765 2765-2770 . Like sample at 2755-2760 ft. Sand, fine to medium-grained, and abo~t 5 percent nodules of dark-green :glaucoiJ.ite. _.The sample . c~ntains. also, a trace of LOGS OF SELECTED WELLS IN THE COASTAL PLAIN OF GEORGIA 105 Depth (feet) Description mica, a few shell fragments, .and fragments of several kinds of clay and sandstone. 2770-2775 ., Like. sample at 2765-2770 ft., mainly sa-ltd, but less glauconite. 2775-2780 No sample. 2780-2785 Sand, fine to coarse-grained; about 5 percent glauconite; a trace of mica; a few shell fragments; a few specimens of Robulus sp. and a few ostracodes. 2785-2790 Sand, fine-grained; a little glauconite; a trace of mica; a few specimens of Fora~inifera that are caving from higher levels. 2790-2795 Like sample at 2785-2790 ft.; a few shell raiments and a few fragments of Inoceramus. 2795-2800 Like sample at 2790-2795 ft. 2800-2805 Sand, fine to coarse-grained; a little glauconite; a few shell fragments; a few specimens of Robulus sp., and a few ostracodes. 2805-2810 . Sand, glauconite, and a few _specimens of Robulus sp., like sample at 2800-2805 ft. 2810 . Circulating. Like sample at 2805-2810 ft., and a few shell fragnie~ts, including fragments of Inocer~mus. ,.. ~810-2850 No samples. 28.59-2855 Sand, mainly fine to coarse-grained; about 1 percent glauconite; a few small fragments of worn shells. 2855-2860 ,Like sample at 2850-2855 ft. 2860-2865 No change. 2865-2870 Sand, mostly fine-grained, and a few coarse grains; about 10 per- cent gla~conite; a few phosphatic fragments of clay and sa~d- stone ; a few very small fragments of shells. 2870-2875 . .Sand, fine to coarse-grajned;. about 1 percent glauconite; a . few - very small fragments of shells j a few nodules of several kinds of calcareous -sandstone. Sand, clear quartz, mainly. fine to medium-grained; about 5 per- n. centnodules of . glaucohite; ~ few fragments of sandstone. 2880-2885 2885-2890 ' ~. 2890-2895 Sand, clear quartz, fine to medium-grained, subangular; about 1 percent glauconite; a few phosphatic fragments; a few fragments of different kinds of sandstone; a few fragments of bro. wni.sh..-gray. shale; a .few v..ery small f.ragments of shells. Sand, clear quartz, fine-grained, angular; about 1 percent glauco~ . nite; a trace of mica; a few fragments of sandstone and a few . fragments of shells. Like sample at 2855-2890 ft. 2895-2900 Sand and other materials like the immediately preceding sample; . coarse grains of sand are somewhat more common. Sand, fine to coarse-grained; about 5 percent glauconite; a few shell fragments; a few fragments of several kinds of calcareous - sandstone. Depth (feet) 2905-2910 ' 2910-2915 2915-2920 2920-2925 2925-2930 2930 2930-2935 2935-2940 2940-2945 2945-2950 2954 2950-2955 2955-3005 3005-3010 GEORGIA GEOLOGICAL SURVEY BULLETIN 74 Description Small sample composed of material like _the sample at 2900-2905 ft. ' A few specimens of Robulus sp. occur in this sample. Sand, fine to coarse-grained; about 1 percent glauconite; many fragments of several kinds of sandy limestone and several kinds of shaly clay that are obviously caving; relatively few fragments of worn shells. This sample is fairly large. Sand, fine to medium-grained; about 1 percent glauconite; a few fragments of sandstone and a few of shaly clay; a few specimens of ostracodes and Foraminifera (Robulus sp. and some very small Foraminifera). Materials like the sample at 2915-2920 ft. A few specimens of Cretaceous species of Foraminifera which seem to be indigenous, are: Globotruncana spp., Globigerina sp. and G~mbelma globu- losa. Other speCimens of species indicative of the Taylor age ot the beds are: Planulina taylorensis, Mwrginulina directa, Loxo- stoma cushmani, and the ostracode Cythereis rugosi8si'I1UL. '- The small, washed concentrate is composed mainly of fine to coarse- grained quartz sand; about 1 percent glauconite; a trace of mica, and a little lignite. Other materials in the washed sample are, a few fragments of several kinds of calcareous, micaceous sandstone; a .few fragments of gray and brownish-gray, soft, shaly clay; a few specimens of Globotruncana spp. and Globi- gerina sp. are probably indigenous; like, the specimens in the sample at 2920-2925 ft. Other foraminiferal specimens are pres- sent, but may be caving. Circulating. Like sample at 2925-2930 ft. Sand, fine tci medium-grained; fiiui-grain~d sand predominates in this fairly large sample. The sample also contains about 5 percent glauconite ; a very few sheU fragm ents; a few frag~ - ' ments of dark brownish-gray, micaceous, shaly clay containing a few small pieces of fossil shells. The mi'crofauna is like that in the sample at 2925-2930 ft. A small sample that is like the sample at 2930-2935 ft., and in addition, contains a little carbonaceous material.. No change. No change. Circulating. Sand, clear quartz, fine to coarse-grained; about 5 percent glauconite; a few shell fragments'; a few fragments of light and dark-gray, flaky, clay shalei specimens of species of Foraminifera and Ostracoda that seem to be caving fro_m several higher levels. No change. No change. Sand and other materials and a few forams as in the immediately prec'eding samples; a few specimens of Planulina taylorensi8 are possibly indigenous in the beds penetrated .near this depth. I' LOGS OF SELECTED WELLS IN THE CoASTAL PLAIN OF GEORGIA 107 .,' . Depth (feet) Description '. 3010-3015 Sand, fine to coarse-grained; about 1 percent small nodules of glauconite; a few fragments of 0Btrea-like bivavles; a few fragments of several kinds of gray and brownish-gray shale; a 'few fragments of sandstone and siltstone; afew specimens of Cretaceous Foraminifera but none are narrowly restricted forms.. Beds of Austin age 3015-3020 A small sample like the sample at 3010-3015 ft. in character and fauna, but contains many fragments of gray, flaky, micaceous shale, which may be the material penetrated at this depth. 3020-3025 Like sample at 3015-3020 ft. 3025-3030 No change. The gray flaky shale contains fragments of carbonaceous material. 3030-3035 Sand, fine to coarse-grained; about 1 percent glauconite; many fragments of gray, slightly micaceous, irregularly carbonaceous shale containing a few poorly-preserved specimens of Cretaceous Foraminifera. 3035-3040 Like sample at 3030-3035 ft. 3040-3045' No change. 3045-3050 Sand, like the preceding samples; a little glau~onite ; about 50 percent fragments of gray, slightly micaceous, irregularly car- bonaceous shale; a few fragments of extremely fine grained, finely glauconitic, .'calcareous sandstone, one fragm ent of which contains a well~preserved part of a specimen of Citharina tex- i t . ana. 3050-305{) Shale, gray, soft, and sand like sample at 3045-3050 ft. The sample contains, in addition, fragments of light greenish-gray, ex- , tremely fine-grained, argillaceous, calcareous sandstone, and a few specimens of Cretaceous Foraminifera. 3055-3060 ,. Mainly sand and glauconite, but' relatively little shale. The fauna is sparse and composed of specimens of Cretaceous Foraminifera that are not narrowly r (;lstricted stratigraphically. 3060-3065 Like sample at 3055-3060 ft. 3065-3070 Sand, fine to coarse-grained; about. 25 percent fragments of gray flaky shale; a few fragments of extremely fine-grained, argil- . laceous, calcareous sandstone ; a -few specimens of Cretaceous Foraminifera. 3070-3075 Like sample at 3065-3070 ft., but showing an increase in the peri centageof fragments of gray, shale, which is more thinly flaky than in the preceding sample. The fauna contains a few specimens of PlanU:lina austiniana. 3075-3080 Like sample at 3070-3075 ft.; a few specimens of Planulina aus- , . ~ I' '!. ;.' ' . tiniana. / 3080 Sample is composed of about 70 percent fine to coarse-grained sand; about 5 percent glauconite; and about 25 percent frag- i()g' GEORGIA GEOLOGICAL SuRVEY BULLETIN 74 Depth (feet) Description ments of gr!ly, flaky shale, a few fragments of extremely fine grained sandstone, and a few specimens of Cretaceous Foraminifera. 3085-3095 No samples. ,. . 3095-3100 Like sample at 3080 ft. 3100-3105 No change. 3105-3110 Sand, glauconite, and a little mica, as described in samples beginning at 3015-3020 ft. The sample contains, in addition, many fragments of several kinds of gray shale, a few fragments of extremely fine grained, argillaceous, calcareous, micaceous sandstone, a few fragments of Inoceramus, and a few specimens of Cretaceous Foraminifera. 3110-3115 Like sample at 3105-3110 ft. 3115-3120 No change. 3120-3125 Gray .shale, sand, glauconite, and a few shell fragments like the sample at 3105-3110 ft.; also a .few specime~s of Cretaceous Foramini_fera and Ostracoda. 3125-3130 Shale and sand, like sample at 3120-3125 ft.; very little glauconite; . very few specimens of Foraminifera. .. ' 3130-3135 ' Like sample at 3125-3130 ft. 3135-3140 Material and fauna similar to the immediately preceding samples, . but .very coarse grains of sand are co~~on a~ .!his depth. ! ! 3140-3145 Sand, quartz, fine to very coarse grained, a little glauconite, and a little mica, compose about 50 percent of the sample. Ab()ut 50 percent is composed of fragments of gray~ soft, thinly . flaky, slightly micaceous shale; a few _fragments of very finely granu~ .' lar limestone:; a little argillaceous, calcareous, micaceous, glau- conitic sandstone; a few fragments of phosphatic material; and a few worn fragments of fossil shells. . 3145-3150 Like sample at 3140-3145 ft. 3150-3155 Sand, fine to coarse-grained, and a little giauconite compose about 50 percent of the sample. About 50 percent is composed of frag~ ments of gray, soft, flaky shale; a few shell fragments; an(j a few specimens of Foraminifera, among which are fragments l. of Citharina. texana. The gray shale contains irregularly dis- tributed small -flakes of mica, minute fragments of fossil shells; and sparse small fragments of carbonaceous material. 3155-3160 Like sample at 3150-3155 ft. 3160-3170 No change. . .....~ 3170-3175 Sand, clear quartz, fine to coarse-grained, and a little glauconite compose about 75 percent of the sample. About. 25 percent is: _.. composed of fragments of gray and dark brownish-gray, argil- ~. I' LOGS OF SELECTED WELLS IN THE COASTAL PLAIN OF GEORGIA 109 Depth (feet) Description laceous, micaceous siltstone, and very fine-grain-ed sandstone, . some -of which is finely glauconitic. The sample also contains. a .few _shell fragments and a' few specimens of Cretaceous Fora~ minifera and Ostracoda. . ' . 3175-3180 Like sample at 3170-3175 ft. A chip of gray marly shale contains 318~-3185 .an embedded fragment o{ a small bivalve. . ih Like sample at 70-3175. ft. Sp~ciinens of Robulus sp. are com- .. mon in the microfauna. , ~.:.nt:-. - .~ . . - . ~ :~ - 3185-3250 No change. . 11 .Tuscaloosa Formation -~ . 32,50-3260 Sand; clear quartz, fine to coarse-grained (coarse grains fai~ly common), and a little glauconite. The sample contains a few fragments of several kinds of gray clay "; a few fragments of . .. . :(' I-' siltstone; a few shell fragments; several specimens of Foramini- <' fera and Ostracoda. . 3260-3265 Sand; quartz, fin'e to coarse-grained, subangular; some cavings ~rom higher levels. . 3265-3270 Like sample at 3260-3265 ft. Many of the sand grains are more ' angullii than in the preceding sample, and many grains are slightly etched. 3270-3275 3275-3280 L~e sample at 3265-3270 ft., and a trace of lignite. '' No change: 3280-3285 No change; coarse grains of sand are common. 3285-3290 No change. 3290-3300 ~ Sand, quart~, fine 'to coarse-grained (medium grains strongly dominant), like the samples beginning at 3265-3270 ft.; a few ; fragments .of - lignite; fragments of several kinds of material caving from higher ievels. 3300-3310 (.j ' Like sample at 3290-3300 ft. 3310-3315" - ' Like sample at 3290-3300 ft.; a few sand grains are tinted :yellow 3315-3320 and pink. ' ' .. Like sample at 3290-3300:, ft.: a~ few fragments. of lignite, imd a t-' ; . A , . :-~ few large flakes .of colorless mica:.: .- ., 3320-3325"1' 1Like sample .iit 3315-3320 ft:' ' 3325~3335 ji, No_change<'~ -~- :~~~- :.," ':,: ,,;::. ) !., ''_ :' ~" : ' . 3335-3340 . 33,40-3350 ( u t '\ ~ ~ y. 3350-3360 3360-3370 3370-3375 Like sample at _3315-3320_ Jt., and sparse nodules of siderite. ' ' " . . ' ' . ' '' '1: ~ ( ' I ,' ' 1 .' ~ Sand, like sample at 3335-3340 ft., but no siderite. :tt:, S.a~d;. . ..like' .~ample. 'a t . a3' 40~:3s5o . ~nd -~ trace of mica. . Sand, mainly quartz, and a few grains of white feldspar, : . No change_. 3375-3380 Sand, clear quartz, fine to coarse-grained; a few spherules of / siderite; .a trace of lignite; a few cavings. 3380-3385 No change. ,. l:t<;., .. ~ . Depth (feet) 3385-3420 3420-3425 3425-3430 3430-3435 3435-3440 3440-3450 3450-3460 3460-3465 3465-3470 3470-3500 3500-3505 3505~ 3510 3510-3520 3520-3590 . 3590-3600 3600-3610 3610-3620. 3620-3630 3630-367() 3670-3680 .. 3680-3690 3690-3700 3700-3710 3710-'3750 3760-3760 GEORGIA GEOLOGICAL SURVEY BULLETIN 74 Desc:i-iptiori. No change. f Sand, like s;~ple at 3375-3380 ft., but this sample contains more siderite spherules and more fragments of white feldspar. No change. Sand, quartz, fine to coarse-grained (inedium grains dominant); ~ few grains of white feldspar, and a few siderite spherules. Sand, -white, quartz, fine to coaz:se-grained (coarse grains "common). The sample contains a traceof mica; a few quartz grains tinted yellow and pink; a few grains of white feldspar; and a few nodules of siderite. Like sample at 3435-3440 ft. Sand, similar to sample at 3435-3440 ft.; but fine grains are dominant. The sample contains a little glauconite that is probably caving. Sand, fine to coarse-grained; a few grains of white feldspar; a few nodules of siderite; a few cavings. Like sample at 3460-3465 ft. No change. Sand, quartz, fine to c-oarse-grained, subangular and a little white hl~p~ . - ~ Sand,-like sample at 3500-3505 ft.; a few quartz grains are tinted pink. The sample contains a few nodules of si.d.e, rite. No change. No change. Similar to sample at 3505-3510 ft.; a trace of white feldspar. , . . ' *' No change. .. Sand, coarse-grained, pink-tinted grains are fairly common; a few. . nodules of siderite. Sand, clear quartz, fine to coarse-grained (coarse grains strongly dominant) ; a few grains of white feldspar; a few nodules of siderite. Some quartz grains are tinted pink. . Like sample at 3620-3630 ft. t: Sand,. clear quartz, and a few pink. grains; the sand is somewh~t finer grained than in the sample at 3620-3630 ft. The sampie contains a few nodules of siderite, a few grains of white feldspar, and a few small grains ~f obsidian ( ?) : Lik.e samPle at 3670-368.0 ft.; obsidian ( ?.) iS ra~e. , -~ . .,lo :... Sand, clear quartz, coarse to very coarse grained; a few grains of pink-tinted quartz; a few grains of white feldspar: Like sample at 3690-3700 ft.. No change. . Comanche Series (?) undifferentiated Sand, like immediately preceding samples. The sample contains, hi .. s I' 1. :; :u .lJ_@)! .). LOGS OF SELEcTED WELLS IN THE COASTAL PLAIN OF GEORGIA {11 Depth (feet) 3760-3770 3770-3810 3810-3820 3820-3850 3850-3860 3860-3870 3870-3880 3880-3890 3890-3900 3900-3910 3910-3920 3920-3930 ' 3930-3940 3940-3950 3950-3960 3960-3970 3970-3980 3980-3990 Description addition, a few nodules of siderite, and a few fragments of red, yellow, and gray mottled, micaceous silty mudstone. The unfossiliferous mudstone is lithologically similar to rocks that have been clas~ified as Comanche in .many wells in the southeastern Gulf Coast region. On "the basis of the highest occ~rrence of the mud.ston!! in the Knight ~ell 1, supported by electric log characteristics, the top of the Comanche ( ?) is placed at 3750 ft. Like sample at 3750-3760 ft. No change. Sand, clear quartz, coarse to very coarse-grained; a few grains of white feldspar. A few of the quartz grains are tinted pink. Like sample at 3810-3820 ft. Like sample at 3810-3820 ft., but this sample contains more white feldspar. Sand, coarse to very coarse grained;- a few pink-tinted grains of ' quartz; a few grains of white feldspar; a few grains of ob- sidian ( ?) ; and a ew moderately large nodules of siderite. Sand and other materials like sample at 3860-3870 ft., and in addi- tion, fragments of hght yellowish-green clay and red, .f{nely micaceous clay. Sand, white, very coarse grained; a few grains of white feldspar. A few quartz grains are tinted pink. Sand, similar to the sample at 3880-3890 :ft., but coarser grained; grains of white feldspar are fairly common. Like sample at 3890-3900 ft., and in addition, a few fragments of red and greenish-yellow mottled micaceous clay. Like sample 3900-3910 ft., but contains no mottled clay. Sand, quartz, fine to very coarse-grained, and a little white feld- spar. The sample contains, in addition, a few nodules of siderite, fragments of red, gray and greenish-yellow mottled, finely micaceous clay, and cavings of other materials. Like sample at 3920-3930 ft. Like sample at 3920-3930 ft., but contains more coarse grains of sand. Sand, fine to very coarse grained; a few nodules of sandy siderite; a little limonite; many fragments of dark-red micaceous shale, greenish-yellow arid gray mottled shale, and red and lightraspberry mottled shale. This sample contains other materials that are caving from higher levels. Sand, fine to very coarse grained, like samples at 3950-3960 ft., and a very small amount of vari-colored shale. Like sample at 3960-3970 ft. Sand, fine to very coarse grained (coarse grains compose about 50 percent), and a little varicolored shale; a few nodules .of 112 GEORGIA GEOLOGICAL SURVEY BULLETIN 74 Depth ( f ee t ) 3990-4000 4000-4030 4030-4040 4040-4050 4050-4060 4060-4070 4070-4080 4080-4090 4090-4100 4100-4110 Description siderite and cavirigs of various materials are components of the sample. ,.,.. Like sample at 3980-3990 ft. No change. Sand, like sampfe at 3980-3990. ft.; yellow-tinted grains are fairly common. The sample contains a little yellow feldspar. Like sample at 4030-4040 ft. and a few fragments of bluish-gray, weakly sandy (very fine grained sand) shaly clay. Like sample at 4040-4050 ft., but fragments of the shaly clay are much more abundant. No change. No change. Sand, yellow and red, fine to very coarse grained, the coarse grains being dominant; a few grains of feldspar; a trace of mica; and a fe.w fragments of brick-red clay. . Sand, like sample at 4080~4090 ft.; grains of feldspar of vario~s colors are common in the sand. The sample contains a few frag- ments of red and white mottled, sandy, micaceous clay. ' Sand, like sample at 4090-4100 ft., but the grains are slightly coarser. The ..sample contailis a trace of . red, .sandy, micaceous clay. Pre-Cretaceous rocks 4110-4130 T.D. Sand, like sample at 4100-4110 ft., and fragments of granite. The top of the granite in the .Thurman well 1 is placed at 4110 ft. . on the basis of electric log correlation and the petrographic . determination of selected fragments, of c.uttings... COLQUI'IT COUNTY Operator: R. T. Adams Landowner: D. G. Arrington Well 1 Location: Land District 8, Land Lot 270 ; 760 ft. west of east line; 210 ft. north of south line of land lot . 270. GGS. No. 170 Elevation: 270 (est.) Total depth: 4904 ft. Completed: Aug. 25,1948 .i I ] LOGS OF SELECTED WELLS I N THE COASTAL PLAIN OF GEORGIA 113 Summary of Stratigraphy Tertiary Depth (feet) Thlckneaa (feet) Not studied Cretaceous Gulf Beds of Navarro age_________________________________,_.__::________ 1680 Beds of Taylor age_____________________~-----~-~----------- 1900 Beds of Austin age_______ _____~----------- - - -- 2440? Atkinson Formation upper member_____________ 2806 lower member________________ 3290 220: 540 366? 484 220 Comanche undifferentiated -"--..::---------------------------------- 3510 total 1394 depth Lithologic and paleontologic descriptions of cuttings and cores. Samples are cuttings unless otherwise stated. Depth (feet) . 0-1680 Description Samples not studied. CretaceQus Gulf Series 1680-1690. 1690-1900 Beds of Navarro .age . . . . Shale, gray, and a little fine-gi'a~ned sand probably indicate the material drilled at this depth; the fauna consists of a few speci- mens of Globotruncana area and a few specimens of other Cre- taceous species of F-oraminifera. The sample contains many fragments of Limestone from the overlying Clayton (Midway) -. Formation. Lithology and fauna like the sample at 1680-1690 ft. Beds of Taylor age 1900-1910 Shale, gray, and many fragments of gray, sandy (very fine grained sand) clay shale, and light-gray, hard, very fine grained sandstone. 1910-1920 Like sample at 1900-1910 ft.; sample contains abundant specimen~ . of Lituola taylorensis. 1920-2060 Samples not studied in detail. 2060-2070 . , Shale, gray, a little sandy shale, and specimens of Globorotalites conicus, Plan~lina dumblei and Stensiiiina americCLna.. / 2070-2710 Samplesnot studied in detail. Depth (feet) 2710 2710 2725 2731 2806 2850-2860 2860-2870 2870-2880 2880-3000 3000-3010 3010-3020 3020-3030 3030-3060 3060-3070 GEORGIA GEOLOGICAL SURVEY BULLETIN 74 Description Beds of Austin age Sidewall coi'e. Shale, gray, contalning glauconite and pyrite, fragments and prisms of Inoceramus, many specimens of Citharina texana, and a few specimens of other Foraminifera, mainly Globot-runcana sp. Sidewall core. Shale, gray, soft, chalky, containing abundant.Inoceramus prisms and specimens, of Citharina texana; specimens of Gumbelinci sp. and Globigerina sp. are common. Sidewall core. Sandstone, cream, moderately hard, chalky, very firie-graine'd, glauconitic; contains fragments of Ostrea sp. Sidewall core. Shale, gray, soft, sandy (very fine grained sand), glauconitic. Fauna consists mainly of specimens of a small Anomalina sp. indicative of the beds of Austin age. Atkinson Formation. Upper Member. Sidewall core. Shale, gray, soft, fine-grained, argillaceous, containing a few fragments of phosphatic material, carbonaceous material, and a little mica. Shale, gray, containing many fragments of Ostrea sp., a little carbonaceous material; and a few fragments. of white, medium to fine-grained, somewhat phosphatic, slightly glauconitic sand~ stone. The fragments of Ost1ea sp. are probably indigenous, but the few specimens of Foraminifera in the sample seem --to cave from higher levels. Like the sample at 2850-2860 ft. Like the sample at 2850-2860 ft., and containing a few fragments . of grayish-green shale. No change. The specimens of Foraminifera are species that occur in the lower part of the beds of Austin age; species indicative. of the upper member of the 'Atkinson Formation (Eagle Ford age) were not observed. .. Like the samples at 2880-3000 ft., with the addition of grains of coarse sand. Samples not studied. Sand, coarse to very coarse, and a little nodular sandstone. Samples not studied. Sand, fine to coarse-grained (coarse grains common). The sample contains a few fragments of white, moderately hard, medium- , grained sandstone showing a few pink-tinted grains. r l;: r~ ,t ~ . ~:: !7 i:. __ Q ~ I' $ _ JLW Ht u lh . t#A.-4 -- L OGS OF SELECTED WELLS IN THE COASTAL PLAIN OF GEORGIA .115 Depth (feet) 3070-3200 3200-3210 3210-3220 3220-3230 3230-3240 3240-3290 D escription Samples are like the. sample at 3060-3070 ft. and contain cavings in variable amounts. Sand and sandstone like the immediately preceding samples, and also many fragments of white, moderately hard, fine to mediumgrained, glauconitic, somewhat phosphatic sandstone. Like sample at 3200-3_210 ft., showing an increase in the amQunt of glauconitic sandstone. Sample not studied. Sample is mainly cavings, and the material drilled at this depth is not clearly shown. The material in the sample consists of gray shale (probably from the beds of Austin age), a few fragments of glauconitic sandstone like that in the samples at 32003220 ft., and specimens of Foraminifera from higher levels. The sample contains fragments of carbonaceous material that increase progressively with depth from 3240 to 3290 ft. Samples not studied in detail. 3290-3300 3300-3320 3320-3330 3330-3340 3340-3510 Atkinson Formation. Lower Member. Like sample at. 3230-3240 ft., and in addition, many fragments of white, fine to medium-grained, calcareous, glauconitic, somewhat micaceous sandstone containing many fragments of shells (Ostrea sp. and possibly other fossil bivalves). Samples not studied. Shale, dark-gray, hard, flaky, is probably the material drilled at this depth. The sample contains much gray clay shale that is caving from higher levels. The sample shows an increase in the amount of dark-gray, micaceous shale described. in the sample at 3320-3330 ft. The microfauna seems to be mainly caving from higher levels. Specimens of Foraminifera indicative of the lower'member of the Atkinson Formation do not. see!ll to occur in this sample, possibly because of the small amount of dark-gray shale in proportion to the large quantity of cavings. It is possible, also, that specimens, if present, were removed from the sample prior to this study. Samples are mainly cavings of gray clay shale, dark micaceous shale, fine-grained sand, and glauconite; the microfauna is sparse and seems to have caved from higher levels. 3513 3520-3030 / 3530-3540 Comanche Series undifferentiated Materials similar to those described in the sample from 3340 to 3510 ft., and also a little coarse-grained quartz sand. 'sand, coarse-grained, quartz; a few fragments of waxy, mustardcolored, red mottled shale; many cavings. Like sample at 3520-3530 ft. / GEORGIA GEOLOGICAL SURVEY BULLETIN 74 Depth (feet) Description 3540-3550 Like sample at 3530-3540 ft., and a few fragments of greenishbrown, red and light-gray mottled micaceous shale. 3550-3560 3560-3570 Like sample at 3540-3550 ft. Sand, fine to very coarse grained (coarse grains common) quartz, and a few grains of felilspar; some of the quartz grains are redtinted. Sand is about 50 percent of the sample. A few fragments of mottled or varicolored shale and cavings from higher levels compose about 50 pe~cent of the sample. 3570-3600 No change. 3600-3610 Sand, varicolored shale, and cavings, like the sample at 3560-3570 ft., and many fragments of dark purplish-red, micaceous shale. 3610-3630 Sample not described. 3630-3640 Sand, 50 percent of sample, and 50 percent cavings of gray clay shale and a few fragments.of red and mottled shale. 3640-3770 No change. 3770-3780 Sand, fine-grained, many fragments of brownish to purplish-red, gray and mustard-colored, micaceous shale, and many cavings. 3780-3800 No change. 3800-3810 Sand, white, mainly coarse-grained, quartz; a few amber and pinktinted grains; a few grains of feldspar; a little red and mottled shale; cavings. 3810-4904 T.D. Samples not studied in detail. The material is sand, sandy clay, and varicolored clay, and is seemingly not older than Comanche. COLQUITT COUNTY Owner: :.City of Moultrie, well 3 GGS No. , Elevation: 340 ft. (est.) Total depth: 745ft.. Completed: Aug. ( ?) 1936 Summary of Stratigraphy Depth (feet) " (. Thickness (feet) Tertiary Pliocene to Reeent 1 sa~ple at 150 ft------------------------~ ? ? Miocene undifferentiated ------------~,------------ 165 243 Oligocene do 408 262 E:ocene to upper, Ocala Limestone, upper member _____________ 670 total 75 J 'l depth .L I' ' . JE .AWPt ;e .4 a a . J. LOGS OF SELECTED WELLS IN THE COASTAL PLAIN OF GEORGIA 117 Lithologic and paleontologic descriptions of cutting s~_mples. -J. Depth ... 't,! (feet} Description Pliocene Series to Recent Series "':i 150 ;: Sand; coarse-grained, subangular, clear quartz, and a few r~qdish brown and gray sandy nodules. Miocene. Series u~differentiated . ' 165 ~- . ' Clay, white, sandy (fine-grained sand). . Washed residue, large. Sand, fine-grained, moderately even-grain- ed, angular, clear quartz, and a few nodules of clay. ., 170 Clay, white to,light-green, sandy (fine-grained sand). Washed residue, large. Sand, very uneven-grained, clear quartz, and about 25 percent nodules of hard clay. 200 210 ~~ I J~ - Clay, light-green. Washed residue, very small. Sand, un~ven-grained, angular, clear quartz. ; .~ Clay, light-green. . Washed residue, small. Sand, uneven-grained, angular, clear quartz, and about 10 percent small nodular fragments of light- green clay. 220 .1 230 ... 235 Clay, light-green, sandy. Washed residue, moderately small.. Sand, very fine grained, evengrained, angular, clear quartz, and a few fragments of hard clay. Clay, Iight-gr~en and tan, fairly hard. . Washed residue, moderately_small. Clay, and about 25 percent very fine grained, clear quartz sand, and a few chalky lime nodules. Clay, light-green arid Iight~tan, sa~dy (fine-grained sand), slightly . . calcareous. Washed residue, moderately large. Clay, and about 21!. percent fine-grained, angular, clear quartz sand. 240 ( ?) Clay, light-green, somewhat sandy. Washed residue, small. Clay, and about 50 percent fine-grained clear q-uartz sand. .. 245 Like samples at 240(?) ft. 250 Clay, light-green, fairly hard, sandy (fine-grained sand), and a few chalky lfme nodules; Washed residue, small. Clay, and a small amount of sand. 260 Clay, olive-green, and lime nodules. Washed residue. Sand, moderately fine-grained, even-grained, clear quartz, and a few nodules of hard sandy clay. 270 / Like the sample at 260 ft. . - !!iii Depth (feet) 280 290 305 325 365 370 390 408 420 430 440 465 GEORGIA GEOLOGICAL SURVEY BULLETIN 74 Description Washed residue, large. Nodular fragments of sandy clay. Material and washed residue like sample at 270 ft., with the addi- tion of a few fragments of grayish-green, flaky, somewhat carbonaceous shale. Clay, olive-green, and nodules of white, calcareous clay. Washed residue, moderately large. Clay, nodular, highly sandy, calcareous, and about 25 percent very uneven grained, clear quartz sand and a few fragments of olive-green shale. Clay, olive-green, and cream, calcareous, Sandy nodules. Washed residue, moderately large. Clay, nodular, sandy, calcareous, and about 50 percent, uneven-grained, clear quartz sand and many fragments of light-green, shaly clay. Clay, olive-green. Washed residue, moderately large. Clay, nodular, hard, sandy, cal- careous, and a little uneven-grained,clear quartz sand. Like the sample at 325 ft., with the addition of a few cream nodules of hard .sandy chalk. Clay, cream, shaly, sandy, unctuous. Washed residue, moderately large; composed of angular fragments of the clay, and about 50 percent fine-grained, moderately even g,rained, angular, clear quartz sand. Clay, olive-green, sandy. Washed residue, moderately large. Sand, fine to coars-e-grained, angular, clear quartz; a few fragments of carbonaceous material; about 10 percent nodules of the olive-green hard clay. Oligocene Series undifferentiated Clay, green, nodular, and fragments of white, chalky, sandy lime- stone. Washed residue, large. Fragments of the clay and limestone, and a little uneven-grained, clear quartz sand that washes from the clay nodules; a .few poorly-preserved molds of ostracode cara~ paces, and a f ew vague impressions of fragments of fossils in the limestone cuttings. Limestone, white, chalky, somewhat sandy; fragments of olive- green, sandy, shaly clay; a little clear quartz sand. ~' Limestone, white, sandy, very finely granular, containing impressions of fragments of fossils; a little clear quartz sand. The fossils are Pecten sp. and others that are not determinable. Limestone, greenish-brown, nodular, dense, sandy, unfossiliferous( ?) . Clay, green, shaly, and a few limestone nodules. Washed residue, small. Sand, uneven-grained, Clear quartz; a few nodular, calcareous, sandy fragments of the green shaly. clay; and a few reddish-yellow sandy nodules. ,. 0 I I. LOGS OF SELECTED WELLS IN THE COASTAL PLAIN OF GEORGIA 119 :Pepth (feet) 480 500 ,,. 515 530 540 550 560 575 585 ' . . ' 595 .;-.. "- Ji 605 . 6_15 ,. . t.- . ,, , . ..... : !! ..... ~ -~ 625 635 650 660 Description Limestone, light-gray, hard, nodular, fossiliferous, and a few nodular fragments of brown, granular dolomite. The fossils are usually firmly embedded in the hard limestone nodules, and seem to be water-worn, but calcitized specimens of Lepidocyclina cf. L. chattahoocheiinsis, Gypsina globula, and a few miliolids and fragments of Pecten sp. were identified. Limestone, cream, hard, nodular, fossiliferous,: lithologically and faunally similar to the sample at 480 ft. In addition to the fauna in the preceding sample, the limestone contains bryozoan fragments, a few highly ornamented echinoid spines, a few worn specimens of Ca.merina sp., ostracode carapaces, a large speci. men of Quinqueloculina sp., Asterigerina sp., and a number of specimens of Rotaliidae, including Rotalia cf. R. m exicana var. Dolomite, brown, granular, crystalline, a:nd about 15 percent small fragments of white, chalky coquina. Coquina, chalky, por ous, and a few nodular fragments of brown, granular dolomite; abundant fragments of Pecten sp., Bryozoa, and echinoid spines; specimens of L epidocyclina mantelli, Operculina? sp., Rotalia mexicana var., Quinqueloculina sp., Asterigerina cf. A. subacuta, and Discorbis patteliformis are common. Like the sample at 530 ft., with specimens added to the fauna as follows : Gypsina .globu la (common), Eponides sp. and Asterigerina sp. (.very common). Rotalia cf. R. mexicana var. is rare in this sample. Like sample at 540 ft. Dolomite, brown, granular, crystalline, and a few fragments of coquina, probably from closely overlying levels. Like the sample at:560 ft. Limestone, brown, granular, crystalline to cryptocrystalline, in which ' chalky fragffierits of specimens of L epidocyciina cf. L. pseudomarginata and some fragments of Pecten sp. are em- bedded. tt' ;", ~ ... . ;.,., Like sample at 585 ft., but containing more apundant fossil ma- . terial. Like samp!e at 595. ~~ :) .Dolomite, brown to light-tan, finely granular, somewhat chalky; . fauna like the immediately preceding samples. Like the sample at 615 ft.,but the fauna consists only of a few sections of small miliolids. .A few specimens of Lepidocyclina sp. in the sample may have caved from higher Jev~ls. . Limestone, dark-brown to cream, finely granular, crystalline, porous, containing a few very poorly preserved calcitized frag- ments of shell material and L epidocyclina ( ?) sp. Like the sample at 635 ft. No change. / GEORGIA GEOLOGICAL SURVEY BULLETIN 74 Depth (feet) Description Eocene Series Upper Eocene. Ocala Limestone. Upper Member. '< ' 670 Limestone, white, chalky, fossiliferous, and about 20 percent nodu- lar fragments of brown dolomite. The fauna consists of frag- ments of specimens of A sterocyclina georgiana; fragments of echinoids and echinoid spines; bryozoan fragments; fragment of bivalve (genus not determinable); fragments of specimens of R obulus alato-limbatus, Pecten sp., Eponides cf. E. jacksonensis, and Massil~na sp. 700 Limestone, ian to cream, granular, crystalline,.: and a few frag- ments of coquina caving from higher levels; a few fragments of . of L epidocyclina sp. and echinoids... . 710 Most of this sample is like the one at 700 ft. but contains many fragments of . light . grayish-cream crypto-crystalline, porous , limestone in which are embedded many sections of small miliolids, a,nd a few molds of fragments of other fossils. 720 Limestone, chalky, nodular, mictofossiliferous. The fauna is com- posed of bryozoan fragments and fragme.nts of Asterocyclina ge orgiana and other species; also sp'ecimens of Robulus alato- limbfLtus, Eponides jacksonensis, -and .a few other Rotali~dae. 745 T.D. - Limestone, white, chalky,. highly fo~siliferous; bryozoan fragments are abundant; specimens of Foraminifera in the sample are Asterocyclina georgiana, Robulus alato-limbatus, Epon:ides jacksonensis, and others. ."- I DECATUR COUNTY* U. ., .Owner. Operator: , ~ . ; . _I!_ : . S. (War Depart- GGS. No: 55 ment) Bainbridge Basic Flying . 1 . . . '(.\-' ~ , School Well 2 Elevation: 135 _Location: 6 -mi. northwest .of ., :.:r'o~al depth: 422 ft..:;,.. . Bainbridge, Ga. - . Completed: June 19, 1942 ~ .' . .- ( Summary of St~atlgraphy . 'Depth ,do : .r;> Thickness <.. : --~ -~ (feet) (feet) , ,. . .Tertiary . . -~ -.0 01I.goeene.(?.-) ..or Eoc. ene(?) .____ (1.s''amr:p..le) _______________.___ .. 82 ? I I ' , : .J ', [ ' : o . (jo' In Eocene . . . A ,' upper:, Ocala Limest~ne; " upper'member::_-::______ . ~ , 100 55 . .. , lower . m.emb.e:t:--.~...:..:.__~_,________ , 155 upper middle, Avon Park L i m e s t on '~ e ___ - __-_- __ .. . ____;___ .. - . . 230 ' 75 ~1.(. ;;. 55' ,(' f~ *Publication of this data is authorized by the sun Oil Compa,;y; for wlio1r1 the reporf was 'j.. prepared on a commercial basis4 .) . 5 2 l.i $pI AI :z 4641 x uu; q LoGs OF SELECTED WELLS IN THE CoASTAL PLAn:r oF GEORGIA 121 D~pth (feet) Thickness (feet) to _ lower middle, Lake City Limestone ( ?) ________________________ 285 total137 depth Lithologic and paleontologic description of cut- tings and cores. Samples are cuttings unless otherwise stated. Depth (feet) 82 Description Tertiary Oligocene(?) or Eocene(?) Sand, cle~r quartz, fine-grained, and very finely <;Ut fragments of hard, white, chalky limestone. In Eocene Upper Eocene. Ocala Limestone. Upper Memb~r. 100 Limestone, white, chalky, fossiliferous, containing worn fragments - ,. of molds and a few sections of Heterostegina .ocalana, Sphaero- gypsina globula, and Amphistegina pinarensis cosdeni. 110 . Limestone, white, hard, chalky, in nodular fragments that seem ' 1 to be water-worn. The limestone contains worn molds of Le~ docyclina sp. and Sphaerogypsina sp. -120 ,.. Limestone, light-cream, mode.rately hard, chalky containing traces J '' of fossils, among which fragmental sections of Lepidocyclina sp. are fairly common. 125 Limestone, chalky, porous, similar to sample at 120 ft. Very little 1' ' of the fossil material is determinable, but poorly-preserved fragments of Lepidocyclina sp. are present. 130 '- Like sample at 125 ft. 144 Like sample at 125 ft. Upper Eocene. Ocala Limestone. Upper Member. 155 Like sample at 125 ft. Sample contains specimens of. Amphistegi~ pinarensis var., and a few specimens of small Foraminifera typical of the lower member of the Ocala Limestone. ' 168 Limestone, chalky, fossiliferous, having a water-worn appearance. The fauna consists of bryozoan fragments (common), fragments of ~pecimtm~ of Lepidocyciina ocalana, Asterocyclina sp., Amphistegina alabamensis, and specimens of small Foramini- fera characteristic of the lower member of the Ocala Limestone. 178 Like sample at 168 ft. 195 .Limestone, chalky, fossiliferous. The fossils are better preserved . than in the preceding samples, and the fauna contains several ... --!SSii!ij Depth (feet) 210 215 220 225 230 235 238 240 245 248 285 295 GEORGIA GEOLOGICAL SURVEY' BULLETIN 74 Description varieties of Lepidocyclina ocalana, and many specimens of Amphistegina alabamensis and A: pinarensis var. Limestone, . white, dense, containing traces of fossils; also some fragments of white, crystalline, gypsiferous limest~ne. The cuttings of limestone are very small. Limestone, white, dense. The sample is composed of finely cut fragments. Limestone, white, nodular. The sample is composed of finely cut fragments. Like sample at 220 ft. The limestone contains molds of small Foraminifera that are too poorly preserved for identification. Upper Middle Eocene._ Avon Park Limestone. Limestone, white, chalky, moderately hard, containing specimens of Dictyoconus florida.nus and Valvulina sp. Limestone, white, chalky, partly crystalline, containing specimens of Dictyoconus floricla.nus 'and poorly preserved molds of smaller Foraminifera. Limestone,. white, chalky, having a water-worn appearance. The fauna consists of poorly-preserved specimens that are cliiefly fragments of Lepidocyclina sp., Qperculina sp., , and Ca1nerina sp., as in samples above 230, ft., and consequently may be caving, in part. Limestone, white, nodu.lar (small p.odules), somewhat calcitic, containing a few poorly-preserved, largely unidentifiable molds of smaller Foraminifera, am~mg which are specimens of a small Cibicides sp. and a few other qtiestionable rota!id forms. Limestone, white, chalky, porous, nodular (small nodules), s~mewhat calcitic, containing specimens of several species of miliolids, and specimens of Coskinolina jzoridana an!). Valvulammina sp. common in the Avon Park Limestone. Like sample at 245 ft. Lower Middle Eocene. Lake City Limestone (probable equivalent). Limestone, white, dense, chalky, slightly glauconitic. The sample contains many poorly-preserved molds and fragments of Lepidocyclina sp., some of which may be caving from higher levels, but some are definitely indigenous, as L epidocyclina pustulosa. Limestone, in part chalky, in pint dolomitic; crystals of dolomite are scattered 'through the chalky material. The limestone contains a little glauconite, and a few fragmen-ts of molds and small fragmental sections of LePidocyclina sp. Like the sample. at 285 ft., some of the fossil fragments may be caving. LOGS OF SELECTEJ? WELLS IN THE COASTAL PLAIN OF GEORGIA 123 Depth Ueet) 315 '""< .I 325 330 340 365 373 422 T.D. Description Sandstone, very fine grained, slightly glauconitic (fine-grained glauconite), is about 80 perce!Jt of the sample. About 20 percent of the sample is composed of small chalky fragments, much of which is probably worn and broken fossil debris that was irregularly scattered in the sandstone. Bryozoan fragments are common. Sandstone, grayish-tan, very fine grained, calcitic, slightly glauconitic, like sample at 315 ft.; a few chalky fragments are present. Sandstone, highly calcareous, very fine grained, slightly glauconitic. Many fragments of chalky, glauconitic limestone contain traces and fragments of fossils that indicate the material is probably caving from higher levels. Limestone, white, chalky, glauconitic, containing many fragments of Operculinoides sp., Camerina sp., L epidocyclina (Polylepidina) antillea, and Discocyclina flintensis. Limestone, light bluish-gray, hard, dense, containing small scat;;;. tered particles of glauconite. Like sample at 365 ft. Limestone, light-gray, moderately hard, sandy, glauconitic , (finegrained glauconite); no indigenous fossils. DECATUR COUNTY* Owner Operator: U.S. (War Department) Bainbridge Basic 'Flying School Well 1 Landowner: , Location: 6 .mL northwest of Bain- bridge, Ga.; and about 3; 4 mi. south- ..west of Georgia Highway 1. GGS. No. 57 Elevation: 130 ft. Total depth: 1035 ft. . Completed: May 28, 1942 Summary of Stratigraphy Depth (feet) Tertiary ., ,. :t Miocene(?) undifferentiated (1 -sample) _ ____:_ 20 Oligocene(?) do (1 sample) _____ _ . 55 --No , samples_c.__,__ _________ ________._ ___ ___________ , 60 In ' Eocene upper;Ocala Lhnestone, upper member________________"_ 115' lower member________ _ _ 169 Thickness (feet) ? ? .: 55_ 54 137 *Publication .of this data is authorized by the Sun Oil Company, for whom the report' wa.s prepared on a commercial basis. -~ GEORGIA GEOLOGICAL SURVEY BULLETIN 74 middle Unit A _ ---~-------- _____,_ _____ _ . BC _______:___:________.~ _ _____:.:_~_-_'_-.-:-_-~_-_-_--_--_-_~-_-_--__--_-_--_-- D-------------~------------- Dept h {fee t) Thiekneso (feef) 306 47 353 77 430 107 to 537 total 498 depth Lithologic and paleontologic description of cut- tings and cores. Samples are .cuttings unless otherwise stated. D epth l Description \ (feet) Tertiary Miocene(!). undifferentiated 20 Clay, tan, sandy, slightly micaceous; Oligocene (!) undifferentiated 55 Limestone, chalky, water-worn, containing traces of fossils.. 115 130 ,.. j 169 ' . 185 195 205 220 In Eocene Upper Eocene.~ Ocala ~ill}estone. . Upper Member , .. j : . Limestone, light-cream, chalky, porous, composed of pooriy-pre- lierved, fragmentary molds of. fossil shells,. among which, are Lepidocy_clina sp., Gypsina globitla, bryozoan fraitilents, and echi:noid sp~nes. , ; ;' t ' .. Limestone, iron-stained, hard, chalky, water-worn, showing traces of fossil shells; among which are fragments of L epidocyclina sp= U.p.per .Eocene. .. Ocala .Limestone. Lower_ Membe.r. - ~ ~ l . - .:~/.;;{ . Limestone, white, chalky, porous, fossiliferous. Amo:rig the poorlypreserved molds, fragments of molds, and impressions of shells, are specimens .of L epidacyclina sp., Opercu.lina sp., worn frag- ments of . Asterocyclina (? )', A mphist egina pinarensis, Robulus sp., Amphistegina alabamensis, and specimens of a few other small Foraminifera (Ocala species). Limestone, cream, hard, chalky. A few fragments of limestone ; contain traces -of sections of m-icrofossils. ' ' r \ ~ Limestone, chalky. A very small sample. .. ;.-'; Limestone, white, chalky, highly microfossiliferous, containing many specimens of L epidocyclina ocala.na and varieties,.. a f~Yi specimens of Operculina. sp., and many sp'ecimens of 4Jnphis- t egina alabamensis that is common in the lower member ,Pf the Ocala Limestone in western Florida. Limestone, chalky, fossiliferous. Worn fragments of L epidocyclina sp. are cm1nnon, and specimeris of Amphis.tegina pind~ensis .'- .. - LOGS OF SELECTED WELLS IN THE COASTAL PLAIN OF GEORGIA 125 Depth (feet) Descjiption 270 .. ~ r . are abundant. Also present are poorly-preserved specimens of Camerimr, sp;, Operculimr, sp., Gypsina globula, and bryozoan fragments._ ,, ,. . -~ i , _ Limestone, cream, chalky, fossiliferous. ,-The foraminiferal material consists of worn chalky molds. _The species seem to b~ the ' same as in the sample at 220 feet,-but :specimens of Camerimr, sp. are much more abundant. 290 Limestone, ..white. and cream; hard, nod~lar,, containing abundant , traces of fossils and a .few grains of_glauconite. The sample contains fragments of a large coarsely beaded -Lep-idocyclina sp. . ~ I . This7s~mple' is p'ossibly the equivalent. of the Moody's Branch Marl at the base of the Jackson (upper Eocene) Group in Missis- sippi . ..:- . ~ ,J!'. - ~ ~- ) .: ~r:. . .. '. .; ~~~ . : '' - Middle Eocene ., ;) , ' ., 306 Unit A ' 1 . ) , Sandstone, clear quartz, very_ fine- grJ!,ined, somewhat glauconjtic, '. ais chalky. The sandstone contains many calcitic fragments that : seem' to be derived from b~oken fossil shells; one poorly-pre- served chalky specimen 'of 'Lep-idocyclina sp.; and worn bryozoan -. fragments. . .; . .' .: Like sample at 306 ft. ..-~ . 327 Limestone, white, hard, so~ewhat ,glauconitic, c~ntaining . frag- ments of sections of Operculinoides sp., Lepidocyclina (Poly- lepidimr,) antillea, Pseudoph;iigmi?Ui sp. ..Aoout 50 percent of ., __J '., , . the sample is very uneven grained clea; quar~ sand. CaVings of limestone from higher levels are common, a4o- ..J} Sand, like sample at 327 ft:; and small fr~~e~-ts of white, hard, slightly glauconitic chalk. The fauna seems to be like the ~ J ~ ' . sani.ple at 327 ft., but the specimens:are':too poorly presented -< for specific identification. "' ' ;~; ,::- '' "''" 353 -~ ~ Unit B , .. :'3 I .. ' Limestone, light~gray;' dense,' saridy (very'":fin-e grained sand), glauconitic (very fine grained ghiuconit'e). The: grains of glau- ' conite are evenly distributed in the limestone. 370 . Like sample at 353 ft. :. 315 ~,.~ , . Like sample at 353 ft. 400 ' Limestone; light-gray, highly sandy, chalky. The sample contains a trace of mica, fragments of Ostrea, sp. and - ~chinoids,' aiid a m ... very few specimens of smaller Foraminifera, including Cibicides .westi. ...,: . . .. 426 \ .430 Like sampn! at '400 ft. ; T n -Unit C : .. :' .,, , ChaH~; - highly sandy, slightly glauconitic, containing many worn fragments of a thin-shelled bivalve (Ostrea(?) sp.). Several poorly-preserved specimens of small. Foraminifera also , occur, Depth (feet) 435 438 445 458 468 . ' 476 . ' 48.6 490 ' 495 500 '. 505 537 542 655 576 590 605 GEORGIA GEOLOGICAL SURVEY BULLETIN 74 Description among which Asterigerina lisbone-nsis is the dominant form, and Globigerina sp., Cibicides sp., and others are also present. Limestone, iron-stained, hard, glauconitic (moderately coarse grained glauconite), sandy (moderately coarse-grained sand), containing many fragments of a partly calcitized fossil bivalve. The material has the appearance of having been weathered during exposure at the surface. Limestone, white, highly glauconitic (moderately coarse grained glauconite), sandy (moderately coarse grained sand), containing a t:race Of mica. Poorly-preserved fragments -of macrofossils are embedded in the limestone. About 50 percent of the sample is very uneven grained clear quartz sand. Like sample at 438 ft. Sand, chalky, coarse-grained, uneven, glauconitic, containing worn fragments of fossil bivalves, and several chalky, glauconitic specimens of Asterigerina lisbonensis . !' .; ' : Like sa~ple at 458 ft. .,, ._ Sand, clear quartz, unev.en-grained, glauconitic; sand grains and angular to subangular~ Several specimens of small Foramini- f era are present, among which Asterig erinrL lisbonensis is dominant, and Gyroidina soldanii var. octocamerat~ is fairly common. The _sample also .contains a few ostracodes and echinoid spines. Lime~'tone, 'white', hard, sandy, glauconitic, containing fragments of molds of macrofossils. . . . Sll.lld, clear q'uartz, ~~-derate]; coarse-grained, moderately e~en grained, glauconitic, containing a few fragments of a thin. shelled Ostred (?) -sp., and a few ~halky fragments of . other fossils. ~ike sample at 490 ft., but both sand .~nd glauconite are coarser grained, and nodules of glauconite are abundant. Sand, clear quartz, slightly glauconitic. The sand grains ar_e i_nod- erately fine, moderately ev~n, an~tangular. Like sample at 500 ft. r ,,_ 1 -" ~' . .-, U~tD 3(. Sand, pinkish-tan, clear quartz, very uneven grained, angular to subangular to rounded. Sample contains some glauconite . (prob_ably caving) and some fragments of pink clay. Like sample at 537 ft. Sand, pinkish-tan, clear qua1tz, moderately coarse, moderately even grained; a trace of colorless mica. The color of the sand is due to staining by the clay matrix. Sand, light-tan. The sand is somewhat coarser than the sa~ple . at 555 .R!_and contains a few nodul~s of glaucl)~ite. Like sample at 576 ft. ' No change. ' r f ~~;' .. ~l': :~ *t~- .:~~.:-~;::. jjf . I . ; . -' . t !: =-:~\~ : :M -~~-- ":ff _;; ;: d l -!4Jiil LOGS OF SELECTED WELLS lN THE COASTAL PLAIN OF GEORGlA 127 Depth (feet) Description 625 No change. 642 No change. 651 No change. 664 No change. 6~6 ;) _ No change. 681 >. No change. 697 Like preceding samples, but contains. almost no glauconite. 721 ! Like sample at 697 ft. '' 755 Like sample at 721 ft., but .contains no glauconite. 768 Like sample at 755 ft., but sand is coarser grained. 780 Like sample at 768 ft., but contains fragments of sandy .limestone that are probably caving from higher levels. - 820 No change. 909 No change. 925 No change. 940 Sand, like preceding samples, but finer grained, somewhat chalky, and containing many nodules of glauconite. The sample contains several poorlypreserved specimens of smaller Foramiili~era, among which Robulus sp. (close to Lenticulina rotulata) is a common form; no diagnostic species seem to be present. - 970 Sand, clear quartz, uneven grained, somewhat glauconitic, and similar, in general, to sample at 940 ft. This sample also con- tains a few specimens of nondiagnostic species of Foraminifera, and a few other specimens which probably caved from higher depths. 1035 T.D. Sand and a little glauconite like the sample at 970ft., but the sand is somewhat finer grained. DECATUR COUNTY Operator: Hunt Oil Co. Landowner: Metcalf Well 1 Location: Land District 21, Land Lot 260, center of NE lA, of Land Lot - 260 GGS. No. 168 Elevation: 104 ft. (derrick floor) Total depth: 6152 ft. Completed: Aug. 19, 1944 / Summary of Stratigraphy Depth (feet) Tertiary Paleocene In beds containing Tamesi fauna at 1930 ft. _____ ? 1st sample Thickness (feet) ? 128 G~ORGIA GEOLOGICAL SURVEY BULLETIN 74 Depth Thickneae (feet) ' (feet) Cretaceous Gulf . Beds of Navarro age__________ ___ _ _. ____:_:__ 2050 Beds of Taylor age________ ____~------------------------------------ 2100 Beds of Austin age-----------------~------ 2480 Atkinson Formation, upper member____________________ ___ 2900 lower member_ ________:_~-- .3320 Comanche undifferentiated__________ __________________________ 3600 to . 50 380 420 - 420 280 5250 ft.l Lit~ologic . and paleontologic description of cuttings and cores. Samples are cuttings unless otherwise stated. Depth (feet) 0-1930 Description Samples not studied. In Pafeocene Series , ' ..1930-1940 . . ~ 1940-2020 : 2020-2030 2030-2040 2040-2050 Beds oontail'ling Tamesf fauna ...Clay, gray, marly, microfossiliferous; contains many speci~ens of Globigeri1ftl v elascoensis and Globorotalia velascoemis. Other specimens common in the sample are BulimiTUL exigua and Ala- bamina wilcoxensis. Like sample at 1930-1940 ft. Like sample at 1930-1940 ft.; contains specimens of Globorotalia velascoensis and G~ pseudomenadii, which are common in the typical Tamesi (Velasco) in Mexico. Not described. Clay, marly, but harder and less falky than the preceding samples; contains many typical specimen_s of Globorotalia v elascoensis. .. ... . . Cretaceous .' . ). .. ~ Gulf Series '. 2050-2060 2060-2090 ~eds of ;NavaiTo age Marl, gray; _specimens of Globotruncana area, common. Not described. Beds of Taylor age 2090-2100 Marl, gray, and a f ew fragments of fine-grained, chalky glauconitic sandstone. Sample contains specimens of Globorotalites ~' .. lSamp!es not studied below 112110 ft. \ LOGS OF SELECTI!1D WELLS IN THE COASTAL PLAIN 9_F GEORGI~ 129 Depth (feet) 2100-2350 2350-2360 2360-2480 Description conic~s, StensiOina ame_ricana, and a variety of Planulfna dumblei. Not described. Mini, .gray, containing abundant specimens of Foraminifera; com~ mon species are: .Globotruncana spp., Globigeri1Ul oretacea, Pla~' ulina texana, and Stensioina americana. The sampl~ is probably from the low~r par~ of the beds of Taylor .age. Not described. 2480-2490 249Q-2570 2570 2580-2590 2590-2600 2600-2790 2790-2800 2800-2830 2830-2840 2840-2900 Beds of Austin(?) age. .-Marl, gray, containing a specimen of Valvulineria umbilicata typical of the Austin Chalk in Texas, and sp~cimenl! of Ps_eudogau- ' dryinella capitosa. -Not described. Sidewall core. Clay, greenish-gray, marly, micaceous, containing a microfauna indicative of the Austin age ofthe beds. Clay, gray and green, marly, containing specimens of -Kyphopyxa ckristneri. Clay, greenish-gray, shaly, calcareous. Not described. Shale, brown, thinly flaky, slightly speckled, and a little green, flaky, noncalcareous shale. Not described. Shale, dark brownish-gray, flaky, slightly speckled: Not described. -.~~ ~ 2900-2910 2910-2920 2920-2930 2930-2940 ' 2940-2950 2950-2960 2960-2970 2975 . Atkinson Formation. Upper Member. - Sandstone, moderately dense, very fine grained, highly micaceous, _, and fragments of speckled shale; a few shell fragments. Like sample at 2900-2910 ft.; -the sandstone is somewhat glauco-nitic. - Sandstone, like sample at 2900-2910 ft., and many fragments of Ostrea sp. Not described. Sandstone, similarto sample at 29-00-2910 ft,, but somewhat coarser grained and more micaceous; contains a few black phosphatic fragments, a little bluish-green glauconite, nodules of pyrite, and shell fragments. Sandstone and abundant shell fragments, including fragments of Inoceramus. - Not described. Sidewall core. Sand, fine-grained, uneven-grained, angular, clear quartz, contain- . ing a little_glauconite and a few shell fragments. -~- .. - ~ - i30 .GEORGIA GEOLOGICAL SURVEY BULLETIN 74 Depth (feet) Description l 2970-3030 Sand, fine to .moderately fine grained, glauconitic, micaceous, containing shell fragments and fish bones. The various types of shale in the sample are probably cavings from higher levels. 3030-3040' Sand, like samples at 2970-3030 ft., and a little .green flaky shale; shell fragments are abundant. . . , 3040-3060 3060-3070 Not described. Sandstone, ~oderately coarse, glauconitic, fossiliferous; contains fairly large fragments o.f carbonaceous material, many :>hell fragments, fish bones, a:r1d .a few bryozoan fragments. Below this depth, the sandstone becomes harder and finer grained, ana shell fragments gradually decrease in abundance. 3070-3080 Not described. 3080-3090 Sandstone, white, dense, fine-grained, glauconitic, somewhat micaceous, containing phosphatic and carbonaceous material, shell fragments, and bryozoan fragments. 3090-3250 Not described. 3250-3260 Sand and shell fragments. Shell fragments are common. 3260'-3270 Not described. 3270-3280 Clay, green and bluish-green, shaly, and a little sand. SpeCimens of Foraminifera are probably cavings; 3280-3320 Not described. 3320-3330 3330-3390 3390-3400 3400-3420 3420-3430 3430-3440 3440-3510 3510-3520 3520-3530 3530-3540 Atkinson Formation. Lower Member. (electric log correlation) Clay, green, shaly and sand and sandstone like sample at 3270-3280 ft . Shale, green, and other types of shale that seem to be cavings. Shale, dark-gray, hard, is in cuttings at this depth. Shale, dark-gray, micaceous, containing specimens of arenaceous species of Foraminifera typical of the lower member of the Atkinson Formation. The shale is the so-called "marine shale" of the Tuscaloosa Formation. Shale, dark-gray, micaceous, containing specimez{s of Ammobacu- lites bergquU1ti (abmida~t), A. contp?imatus, Trochamminii ra.inwateri, T. exigua, and others. Material and fauna like sample at 3420-3430 ft., but specimens of Foraminifera more abundant. Not described. Shale, gray, and a little -green flaky shale; white, micaceous, glauconitic sandstone is also in cuttings at this depth. Like sample at 3510-3520 ft. Sandstone, white, fine-grain.ed, glauconitic, pyritic, somewhat micaceous, slightly phosphatic, increases in abundance. The sandstone contains a few large grains of quartz. LOGS OF SELECTED WELLS IN THE COASTAL PLAIN OF GEORGIA 131 Depth (feet) 3545 3555 3560-3570 3570-3580 3580-3590 3590-3600 Description Sidewall core. Shale, green, thinly flaky, speckled; contains dwarf specimens of Gumbelina and Globigerina that give the shale a speckled appearance. Sidewall core. Sand, fine to coarse-grained, roughly angular, clear quartz; prob- ably the basal sand of the Atkinson Formation. Sand and sandstone, like the sample at 3510-3520 ft. and below. ' I Sand, coarse-grained, is dominant in the sample; contains many greenish-yellow quartzitic grains, and a few grains of pink feldspar. Sand, like sample at 3570-3580 ft.; ankerite pellets are common: Sand, like sample at 3570-3580 ft., and a few chips.of dark brown- ish-red micaceous shale. J, !;!, 1: '. . l.?k_!. ." . ~- ~;: .-::.- 3600-3610 3608 3623 3610-3900 3900-5240 .. 5240-5250 Comanche Series undifferentiated Sand, coarse-grained, containing greenish-yellow and pink .grains, and a few grains of feldspar. The sample also contains cuttings of dark brownish-red, micaceous, sandy (fine-grained sand), unctuous, shaly clay. Sidewall core. Sand, poorly sorted, fine to coarse-grained, roughly angular quartz, containing a few greenish-yellow grain_s. Sidewall core. Mudstone, brick-red, green and o.chre streaks and mottling, sandy (fine-grained sand), micaceous. . Samples not studied i'n detail. The material is, mainly, coarsegrained sand, and red, green and ochre mottled mudstone; grains of pink feldspar become progressively more abundant with depth. Nodules of white, pink-stained, "sandy limestone are in the samples at 3900 feet. The samples were not stu<_lied in detail, but are composed, mainly, of coarse-grained sand, mudstone and shale, and nodules of. limestone. Shale, -purplish-red, raspberry, and varicolored, and many nodules of white, pink-stained, sandy limestone. The samples were not studied below 5250 ft. At this depth, the samples indicate that the well had not penetrated rocks _older than Comanche age. 132 GEORGIA GEOLOGICAL SURVEY BULLETIN 74 . / DECATUR COUNTY Operator: D. E. Hughes Landowner: H_. W. Martin well 1 . Location: Land District 15, Land Lot 189, center of southeast 40 acres of _S.E. lA, of Land Lot 189 GGS: No. 191 Elevation: 132 ft. (derrick floor) Total depth : 3717 ft. Completed: Dec. 5, 1947 Summary of Stratigraphy Tertiary Not studied Depth Thickness (feet) (feet) Cretaceous Gulf -Beds of Navarro age_ ______ ____ _~------- 1670 Beds of Taylor age_____________________________________________ 1880? Beds of Austin age_ ______.:____ _____ __ _____ 2500? Atkinson Fo~mation, upper member_______:_______________ 2770 lower member..:.___ _________ 3190 .210? 620? 270 ? 420 260 Comanche undifferentiated ---- -------------- --------------------- - 3450 total 267 depth Lithologic and paleontologic description of cuttings and cores. Samples are cuttings unless otherwise stated. Depth (feet) 0-1670 Description Samples not studied. C-retaceous Gulf Series Beds of Navarro Age 1670~1680 Clay, gray, shaly, somewhat micaceous, irregularly arid weakly :~ silty, containing a few specimens of Globotruncana area. The sample also contains abundant cuttings of the- overlying white, chalky, silty, glauconitic Clayton (Paleocene) Limestone, speci- mens of Midway species of Foraminifera, and some species that occur in the Tamesi (Paleocene) fauna. .....: 1680-1790 Materials and fauna like the sample at 1670-1680 ft. but shomng gradual increase in the amount of gray shaly clay and speci- mens of Cretaceous species of Foraminifera. ''.. \ LOGS OF SELECTED WELLS IN THE COASTAL PLAIN OF GEORGIA t33 Depth (feet) 1790-1800 1800-1880 . Description Clay, shaly, fine to coarse-grained sand, and cavings of the Clayton (Paleocene) Limestone. The specimens of Cretaceous species of Foraminifera are mixed with Midway species that have caved from higher levels. No change. 1880-2000 * 2000-2010 2010-2260 2260-2270 2270-2410 2410-2420 2420-2500 Beds of Taylor age The top of the beds of Taylor age is placed.at 1880 ft. on the basis of electric-log characteristics. The highest occurrence of speci- mens of StensioinCL americCLna, a diagnostic Taylor species, is in the sample at 1960-1970 ft. If the species occurred at a higher level, the specimens were obscured by the c~arse-grained sand that composes about 50-75 percent of the samples. Beginning with the sample at 1960-1970 ft., the ~and content diminishes gradually, and is small in the sample at 2000-2010 ft. ., Small sample, composed of fine-grained sand, glauconite, and frag- ments of gray shaly clay -containing Inocera.mus fragments, and . specimens of Stensiaina americana, .P~anulina dumb~ei, and other species of Foraminifera. ' No change. Shale, gray, hard, hegl.ns to .show in this sample and increases in abundance with depth. as the sand content of the samples decreases. The microfauna ,indicates the Taylor age of the beds. No change. Clay, gray, shaly, also fine~grained .. sand, glauconite, and specimens of Foraminifera; includlng Pseudogaudryin ella capitosa that indicates the early Taylor ( ?) or late Austin ( ?) age of the beds. . Not' described. 2500-2520 2520-2530 2530-2560 . 2560-2570 2570-2670 2670-2680 2680-2770 Beds of Austin age (electric log correlation) Not described. . Clay, gray, shaly, fairly hard ; contains InocerCLmus fragments and fragments of specimens of KyphopyxCL christneri (eat:lY Taylor ( ?) or late Au.stin ( ?) age). Not described. Highest occurrence of Citkarina texCLna (definite Austin age). Not described. Shale, gray, speckled, begins to show in the samples. Not described. 2770-2780 Atkinson Formation. Upper Member. Clay, gray, shaly, and a little speckled shale like samples at 2670- 13~ GE.ORGIA GEOLOGICAL SURVEY BULLETIN 74 Depth (feet) Description 2680 and below; in addition, many fragments of white, very fine grained, micaceous, slightly glauconitic sandstone, containing many fragment,s of Ostrea sp. 2784-2793 Core. Recovery? Top. Sandstone, gray, moderately soft, extremely fine grained, highly micaceous and carbonaceous, weakly glauconitic. Middle. Like the top part of the core, but is less carbonaceous and contains thin streaks of greenish-gray shale. Bottom. Clay, gray, shaly, micaceous, sandy (medium-grained sand) ; contains glauconite, many phosphatic nodules, and a few shell fragments. 2780-2820 Cuttings not described. 2820-2830 Sandstone, white, very firie grained, somewhat glauconitic, micaceous, phosphatic; containing many fragments of Ostrea sp., is about 10-25 percent of the sample; a few fragments of greenishgray, soft flaky shale. Cuttings of gray shaly clay that are probably caving from higher depths, composed most of one sample; the specimens of Foraminifera in the sample do not seem to be indigenous to the material penetrated at this depth, but are probably cavings. 2830-2860 Like sample at 2820-2830 ft. 2860-2870 Sandstone, white, medium-grained, phosphatic, glauconitic, micaceous, calcareous, containing many fragments of Ostrea sp., is at least 25 percent of the sample. The upper member of the Atkinson Formatio~ seems to consist of clay, interbedded with Ostrea-bearing sandstone and relatively thin lenses of greenishgray shale. 2870-2940 No change. 2940-2950 Sand, fine to coarse-grained is at least 75 percent of the sample; fragments of white, fossiliferous sandstone, like sample at 28602870 ft.; a few fragments of carbonaceous material. Cuttings of gray shaly clay are probably cavings. 2950-3030 . 3030-3040 No change. The coarse-grained sand composes a smaller part of the cuttings than in the sample at 2940-2950 ft., and the gray clay and fossiliferous sandstone are relatively more abundant. 3040-3060 Not described. 3060-3070 Sandstone, white, medium-grained, glauconitic, phosphatic contain- ing abundant fragments of Ostrea sp., composes most of the ,'. sample. Other constitutents are a little clay, fine to coarse- grained sand, and a few fragments of grayish-green shale. 3080-3090 Clay fragments are dominant in the sample. Fragments of grayish-green shaly clay are more common here than in samples frot:n higher parts of the upper member of the Atkinson Formation. 3090-3110 Not described. LOGS OF SELECTED WELLS. IN THE COASTAL PLAIN OF GEORGIA 135 .~ . Depth (feet) Description 3130 . '). Sidewall core. Sandstone ' or siltstone, light greenish-gray, very fine grained, micaceous, glauconitic, carbonaceous. 3110-3170 Sample seemsr to be mostly cavings composed of sand and clay . from higher levels. 3178 Sidewall core. Siltstone, light-gray, soft, finely glauconitic. 3170-3190 Not described. . Atkinson Forma,tion. Lower Member . 3190-3200 Shale, grayish-green, soft, flaky, somewhat micaceous and finely carbonaceous. 3200-3270 Samples are similar. to the one at 3190-3200 ft., and contain varying amounts of shale that caves from higher levels. 3270-3280 Shale, grayish-green, that is the principal constituent of the sample, contains minute specimens of Foraminifera. 3280-3290 This sample is the highest occurrence of specimens of :Ammooacu- .i.,.._ ,..lites advenus, a characteristic species of the lower member of .the Atkinson Formation (Woodbine age). 3290-33?8 Not described. 3358-3364 Core: Recovery? Top: Sand, gray, soft, fine to medium-grained, argillaceous,' ~i caceous, somewhat glauconitic. Bottom. Sand, light-gray, fine-grained, argillaceous, micaceous, glauconitic, containing fragments of carbonaceous material. 3370~3380 Shale, greenish-gray, flaky, containing a little fine-grained sand and a few specimens of species of Foraminifera characteristic of the lower Atkinson. ,~. . . 3380-3410 No ' change. 3410"3420 shale, like sample at 3370-3380 ft., but 50 percent of the sample '' is fine to coarse-grained, roughly angular, etched quartz and containing a little coarse-grained glauconite. 3420~3430 Not described. , ; .. . 3430-3440 Sandstone, fine to very coarse grained, containing a little glau- conite and few phosphatic nodules. The washed sample is com- posed, chiefly, of loose sand and cemented fragments of the ' sandstone. ~ :.,. 3440-3450 Not described. Comanch~ Series uitdifferentiated -~.... 3450-3460 Sand, fine to coarse-grained, roughly angular,. clear quartz, and a ~- :~ , tr little feldspar ; some simd grains are yellow and pink-tinted. 3460-3470 No change. Sand, like sample at 3450-3460 ft., and a few small fragments of brownish-red, gray and green mottled, slightly micaceous shale. 3480-3'7.17 T :D: The samples were not studied in detail :and are composed, mainly, . ' of sand like .the immediately preceding samples, and sparse frag- ments of red and mi.llti-colored shale. The samples do not sug- gest that the well penetrated beds older than Comanche. 136 GEORGIA GEOLOGICAL SURVEY BULLETIN 74 / EARLY COUNTY Operator: Mont Warren et al Landowner: A. C; Chandler well 1 Location: Land District 26, Land Lot 406, 250 ft. north and 968 ft. west of southeast corner of north one-third of Land Lot406 G.G.S. No. i21 :.,.. Elevation: 187ft. (derrick floor) .. . Total depth: 7320 ft. Completed: Oct. 2, 1943 Summary of Stratigraphy . ~ Tertiary Depth Thickness (feet) (feet) Not" studieq ;j. ,, Cretaceous '. Gulf Beds of Navarro age ----------------------~--~----------------.:.. 1200: Beds of Taylor age _____________.:_________:__________~______c_~--- 1358 Beds of Austin age---------------------------------~-----~---- 1830 . Atkinson Formation, upper member_________________~:__ 2395 lower member____________________ 2915l ' Comanche undifferentiated -----------~---:~------~~~-~----- 2915 ' ~140 ,.158 472 565 520 225 2530(?) or r ..... <- . Upper Triassic (?) Triassic(?) c Newark ( ?) Group ---------------------------------------------~ 5670 ( ?) ?637( ?), ' 930( ?) . I ,, .~ or'~ ' ' ,. ' ~ . . ,5777(?) Devonian (?) :!1 . or 823 ( ?) Mi~dle Devonian (?) Weathered ( ?) sh~l~ _________' 6600 ". .. ~ .l. ' ~~ ,. , , I . '.. . 181 ~ -... _,, ::Devonian ~ - .. .,. Middle Devonian1 Black shale -------------------------~------ 6781 459 ' Ordovician (?) \).~ .......... I Lower Ordovician(?) White sandstone _________.'.____:_ 7240 t to otal ',, 80 ; depth , . . . ( . ~ : 1 Sbwlaacrktzs, hFal. ~ M., as 1"949, Journal of ' Pale. 2590-2605 Sand, unconsolidated, fine to very coarse grained, clear quartz; fragments of fossiliferous sandstone and shells (Ostrea sp.) ' like sample at 2540-2555 ft., but . much .less abundant; increase in .fragments of grayish-green shale . 2605-2628 '' Sand, unconsolidated, like sample at 2590-2605 ft.; fragments of Ostrea sp., phosphatic nodules, and fossiliferous sandstone; fragments of green shale slightly more common than in sample at 2590-2605 ft. Specimens of Valvulineria infrequens fairly common; Planulina, eaglefordensis and Gumbelina m.oremani also present. This sample seems to indicate a brief change to a .deeper-water marine environment.. 2628-2658 Sand, unconsolidated, like sample at 2605-2628 ft.; fossiliferous sandstone; fragments of Ostrea sp.~ flaky green shale, and phosphatic nodules. I 140 GEORGIA GEOLOGICAL SURVEY BULLETIN 74 Depth (feet) 2658-2668 2668-2688 2688-2703 2703-2730 2730-2748 2748-2825 2825-2840 2840-2855 2855-2870 2915-2934 1. 2934-2949 2949-2962 2962-2978 2978-2993 Description Sample almost entirely unconsolidated, fine to moderately coarsegrained quartz sand. Simd, unconsolidated, fine -to very coarse grained; white; slightly glauconitic, phosphatic, calcareous sandstone, containing embedded fragments of Ostrea sp.; grayish-green, flaky, carbonaceous shale. Sample, mainly, unconsolidated :fine to moderately fine-grained sand; a few :fragments of other material like sample 'at. 26682688 ft. Like sample at 2688-2703 ft. Sand, like sample at 2688-2703 :ft.; fragments of fossiliferous sandstone and Ostrea sp. common; a few fragments of flaky, grayish-green shale; much caved material from higher levels. No change. Sand, unconsolidated, fine to moderately :fine grained, quartz; abundant fragments of an Ostrea-like bivalve. . F ossils apparently wash from a fine-grained, somewhat glimconitic, phosphatic, calcareous sandstone. The well may have penetrated a shell reef at this depth. Like sample at 2825-2840 ft., and in addition, a few fragffients of . yellowish-brown and light bluish-green mottled shale, and red- dish-brown shale. A few of the fossiliferoussandstone-fragments are carbonaceous. , , .. ,. Sand, unconsolidated; fine to moderately .fine grained; many {ragments of 6strea sp., and a few fragments of 'white, fine-grained; fossiliferous sandstone; .manY cavings from higher levels: Like. sample at 2855-2870 ft.; fragmentsof -grayish-green s"hale are more c' ommon, ' : ~ I Atkinson Formatio!L ' Low~r Meinber: . ~- I:W I . .'".: Like sample at 2870-2915 ft., but fragments of hard, very fine grained,-calcareous, somewhat glauconitic, 'phosphatic, m_ic!lceous sandstone. are fairly common. ~ l,~ Like sample at 2915-2934. ft., b'ut fragments of sandstone. are more common, and some of them contain embedded shell debris. Sample contains many fragments of grayish-green shale, and a few fragmenj;s of grayish-green shale, and a few fragments of flaky, somewhat micaceous, ca~bonaceous shale. . Sand; unconsolidated, fine to coarse-grained, and abundant fragments of gray and. grayish-green, flaky shale. . Like sample at 2947-2962 ft., and a few fragments of very highly micaceous, slightly carbonaceous, fine-grained sandstone. Shale, dark brownish-gray, flaky, micaceous, slightly carbonaceous, and a little~ grayish-green shale; a little highly micaceous sand- stone like the sample at 2962-2978 ft.; fragments of Ostrea sp. LOGS OF SELECTED WELLS IN THE COASTAL PLAIN OF GEORGIA 141 Depth (feet) Description 2993-3007 . ~ ~~. 3007-3022 Like the sample at 2978-2993 ft.; contains a fragment of thehighly micaceous sandstone that shows embedded fragments of grayish- green shale, and a. fragment of a specimen of an arenaceous species of Foraminife!a: ... ' Shale, dark-gray, flaky, mic~ceous; grayish-green shale; a litt;le sand and a few fragm~nts of micaceous sandstone. The sample contains sp~cimens of .Ammobaculit es com-Primatus and Trocha:m- mina rainwateri.2 .. 3022-3037 3037-3052 . I~ Like the sample at 3007-3022. The microfauna is composed of specimens of Ammobaculites compri'l'iUitus, A. bergquisti, A: ... agrestis, 'A. adv erius. . . . .Like sample at 3007-3022 ft. The mfcrofa~ma is composed of specimens of Ammobaculites 'bergquisti, A : agrestis, A. cf. A . fragmentarious, Ammobaculoides plu1nmerae; Ammotium brau~ .steini, and fragments of Polyphragma sp. . 3052-3067 ,. ' l Shale, gray and greenish-gray, flaky; a little fine-grained mica- ceous sandstone; a little unconsolidated sand. The microfauna is composed of specimens of Ammobaculites bergqu1sti, A. . . junceus; A ~ agrestis. 3067-3o82 . Like sample at 3052-3067 ft., and cavings bf several kinds of niaterial from higher levels; unconsolidated sand composes about 60 percent of the sample .. Fragments of 'light-gray, silty, pqssibly nodular limestone are fairly common. 3082-3097 3097-3112 ;,'?- 3l12-3127 3127-3142 ...:..' ,, Shale; gray, soft, flaky, and many fragments of white to light-gray; fine-grained, calcareous, micaceous, sandstone and siltstone; a ..islittle silty, micaceous limestone. About 25 percent of the sample unco~solidated fine to 'coinse-grained ,quartz sand; Sand: unconsolldat~d, fi.ne to .~oderatel~ ~coarse grained, roughly ' ang~ilar, qu~rtz i many. nodules of dark~green glauconite and of pyrite. . .,.. .. ..-.- . l .. 1.~ I t ' ,. t. ' ~ .~ . . . , of Sand, ' unconsolidated, .''~ine " to coarse-grained; roughly ' angular quartz; fragi}i.eb.ts of .sev~:fal kinds micRceous sandstone and siltstone. . ~ )' .., '" ... ' : ,., Sand, like sample at.3112-3127 ft. Sample -~htains a few nodul~~ of siderite, large flakes of colorless an'd pate.:green micA; and a trace of glauconite. ' ' . , Comanche Series undifferentiated ,I'"' .-, .. (electric log correlati~m) , 3142-3157 Like sa~ple ~t' 3't27-3142 ft., btit cont~i~s no n~dtiles of siderite. 3157-3172 . ;, Sand, unconsolidated: fine to coarse-grained, roughly angular quartz; a few greeh-tinted grail'is; a few large flakes of mica. Phosphate nodules and shell fr~jpnents are probably caving. ,. 'Sampiee f~~in 3007 to. 3067 feet contain ~peeimens of species of Foraminifera characteristc of t he so-called " Barlow" fauna described by E. R.. Applin, 1955, U.S. Geological Survey Prof. Paper 264-1, p. 187-197, pis. 48 a nd 49 . 142 GEORGIA GEOLOGICAL SURVEY BULLETIN 74 / Depth (feet) 3172~3182 3182-3197 3197-3212 3212-3227 3227-3242 3242-3298 3298-3314 3in4-33.29 3329-3408 3408-3423 ' 3423-3438 3438-3453 3453-3469 3469-3484 . 3484-3499 - -.~ : 3499-3514 3514-3530 3530-3545 3445-3639 3639-3747 3747-3762 . ' ~: 3762-3803 Description No sample. Like sample at 3157-3172 ft. Sand, unconsolidated, fine to very coarse grained, roughly angular quartz; fragments of red and gray mottled shale and purplishted, silty clay shale; a few siderite nodules. Sand, unconsolidated, fine to very coarse 'grained, containing grains of feldspar; a little varicolored shale. . Like the sample at 3212-3227 ft. A few siderite nodules present. ;_ No change. Sand, unconsolidated, fi~~ to .very coarse grained, quartz; very coarse grains of quartz and grains of feldspar are common; a few small fragments of multi~colored clay 'shale are present. No change. Sand, like sample at 3298-3314 ft.;-b_ut no shale .present. Sand, unconsolidated, coarse-grained, roughly angular. The color of the sand in the samples from 3329 to 34~3 ft. changes progressively with depth from white to _pink because of the steady increase of pink and yellow-tinted grains of feldspar and quartz. Sand, like sample at 3408-3423 ft.-, but no shale; ._grains. of pink feldspar very common. Sand, like sample at. 3408-3423 ft.; a few nodules of pink sandy limestone; feldspar grains abundant. Sand, like sample at 3408-3423 ft., and a few fragments of dark brownish-red and bluish-gray mottled clay shale. Sand, unconsolidated, fine to moderately fine, :roughly angular quartz; a few coarse grains present; feldspar common. Sand, like sample at 3469-3484 ft., and a few fragments of sandy, mustard-colored clay shale. ' ,.: . Sand, l~e sample at 3469-3484 ft., but coarse grains again com- mon; many fragments of dark-brown a'nd purplish-red and gray mottled, micaceous clay shale. . . . No sampl~s. Sand, unconsolidated, fine to coar~e-grained, , quartz; coarse grains rare; a little feldspar and a few -fragments of m]llticolored shale. No change. Sand, unconsolidated, fine to coarse-grained; a little feldspar and a few fragments of dark-red and bluish-gray mottled, micaceous , , shale. No shale in sample at 3~69-3685 ft. Sand and a little mottled shale like the samples from 3639 to 3747 ft.; a few fragments of flaky, purplish-gray, slightly sandy, ~icaceous shale. Sand, unconsolidated, fine to coarse-grained, quartz; a little feldspar; a few fragments of brownish-red and .gray mot~led _ shale; a little purplish-gray shale. LOGS OF SELECTED WELLS IN THE COASTAL PLAIN OF GEORGIA 143 Depth (feet) Description 3803-3807 No sample. 3807-3867 Sand like the samples from 3762-3803 ft.; ft:agments of red, gray .1 and mustard-colored shale more common. 3867-3967 Sand and a . little multicolored shale like the samples from 3807~ 3867 ft. ;. 3967-3978 Sand like the samples from 3867-3967 ft., and many fragments of brownish-red and gray mottled micaceous shale; a few fragments I' of bluish-green shale; a few fragments of red, gray, and mus- tard-colored mottled shale. 3978-3994 Shale, dark brownish-red, grayish-green mottled, highly micaceous; . a few nodules of pink sandy limestone, 3994-4009 Shale, like the sample at 3978-3994 ft., 50 percent; unconsolidated sand 50 percent. 4009-4024 Sand, unconsolidated, fine to coarse-grained, roughly angular, ~: . quartz, and a little feldspar about 75 percent; multicolQred shale fragments about 25 percent. . . 4024-4083 Sand and multicolored shale like the sample at 4009-4024 ;ft.; the amount of shale in the samples ranges from about 25 to '50 per- . cent. 4083-4098 Sand, unconsolidated, fine to coarse-grained, 50 percent; 50 percent small fragments of red and gray mottled shale, and many large nodules of dark-green glauconite ( ?) or chlorite ( ?) that seem to come in at about this level. 4098-4115 Like the sample at 4083-4093 ft.; some sand grains are stained green, possibly from the glauconite(?) or chlorite(?). 4115-4176 Sand, unconsolidated, fine to coarse-grained; glauconite ( ?) or chlorite (?) , and many green-tinted grains of sand; phosphatized fish remains and other phosphatic fragments; a little multicolored shale. 4176-4207 Sand, unconsolidated, and nodules of glauconite(?) or chlorite(?) like samples at 4115-4176 ft., fragments of red and gray mottled shale fairly common; fragments of red, hard (nodular?), sandy (very fine grained sand) limestone. 4207-4237 Sand, unconsolidated, fine to coarse-grained, quartz, containi~g many green-tinted grains, is about 75 percent of sample. Large nodules of dark-green glauconite ( ?) or chlorite ( ?) , a little red and gray mottled clay, and a few phosphatic nodules, compose about .25 percent of sample. 4237-4297 Sand and glauconite ( ?) or chlorite ( ?) like sample at 4207-4237 ft., shale fragments, and a few fragments of red nodular limestone. 4297-4327 Sand like sample at 4237-4297 ft.; glauconite(?) less common; shale fragments rare; no red nodular limestone. 4327-4342 Sand and glauconite(?) like sample at 4297-4327 ft.; a few fragments of red shale and a few of dull-red nodular limestone. lc '..'" 144 Depth (feet) 4342-4357 4357-4372 4372-4391 4391-4422 4422-4437 4437-4452 4452-4483 4483-4498 4498-4528 4528-4559 4569-463.4 4634-4669 4669-4684 4684-6088 5088-6106 5106-5135 5135-5168 5168-5205 5205-5309 5309-5325 ; GEORGIA GEOLOGICAL SURVEY BuLLETIN 74 Description Sand like the sample at 4327-4342 ft.; a little shale and no limestone; glauconite(?) and green-tinted sand grains less common. Like sample at 4342-4357 ft,; a few small nodules of red limestone. Sand, unconsolidated; glauconite(?); numerous fragments of red and gray mottled, micaceous, sandy clay shale; a few nodules of red l~mestone. a Sand, unconsolidated, fine to moderately coarse-grained, quartz; a .little feldspar, but no green-tinted grains; little glauconite ( ?) ' possibly caving, and a little red shale. Sand, unconsolidated, fine to coarse grained, quartz; numerous fragments of red and gray mottled micaceous clay shale; a few nodules of red limestone. . Sand, fine to coarse-grained, quartz. Sand, like sample at 4437~4452 ft.; many fragments of red and .: gray mottled micaceous shale. Limestone, h'ard, cream, dense, containing a trace ~f glauconite and a few small specimens of Ostracodes; a few large fragments of chert; a little gray clay shale. (Note: This sample is definitely out of place.) Sand, unconsolidated, fine to coarse-grained, quartz, and a llttie feldspar, about 80 percent of sample; small fragments of red shale, about 20 percent. Sand, unconsolidated, fine to very coarse grained, containing many large deep-yellow-tinted grains; a little dull~red and gray mottled shale: . . Sand, like sample at 4528-4659 ft. Sand, unconsolidated, fine to coarse-grained; fragments of red - and gray mottled micaceous shale common. Like sample at 4634-4669 ft., a little glauconite ( ?) which may be caving. No change. Sand, unconsolidated, fine to coars~; green-tinted grains common; a little dark purplish-red clay shale. No samples. Sand, like sample at 5088-5106, a little red .shale, and cavings from higher levels. No change. The samples questionably show the materi~l pene- trated by the drill at this level. Sand, unconsolidated, fine to coarse-grained quartz, containing green-tinted grains, a few pink and yellow-tinted grains, and a little feldspar; fragments of dark, .dull-red and gray mottled, micaceous; somewhat sandy clay shale, and sparce nodules of red and- gray silty limestone; cavings of gray marl and other material . from much higher _levels. Sand like samples at 5205-5309 ft., but coarse grains are rare; a - LOGS OF SELECTED WELLS IN THE COASTAL PLAIN OF GEORGIA 145 Depth (feet) Description I 5325-5340 5340-5354 little purplish-red, gray, green-mottled shale; many cavings. No samples. Sand, unconsolidated, fine to coarse-graine-d; a little red shale; r f' . 5354-5369 . purplish-red and purplish-gray, highly sandy, micaceous shale; a little very fine grained highly micaceous sandstone. Sand like sample at 5340-5354 ft.; fragments of purplish-red and !: gray clay; green, highly sandy, micaceous clay fairly common; a few nodules of red and white limestone. 5369-5452 No change. 5452-5541 Sand, like sample 5340-5354 ft., and many fragments of dark purplish-red, and gray; highly micaceous, sandy shale; several fragments . of bright-yellow, highly micaceous, sandy shale; ~ few nodules of limestone. ' 5541-5677 Mainly" sand and a small amount of shale. 5672-5692 Sand, unconsolidated, fine to coarse-grained, quartz, containing many green-tinted grains; a little glauconite (caving?) 1 a little red micaceous shale; a few nodules of red limestone 5692-5727 No change. 5727-5777 No samples. 5777-5792 5792-580.7 5807-6007 6007-6023 6023-6038 Triassic(?) Upper Triassic(?) Series Newark(?) Group Sand, unconsolidated, :fine to coarse-grained quartz; a few fragments of dark-red shale; a few fragments of light bluish-green shale, some of which are highly silty and micaceous. Sand unconsolidated, fine to coarse-grained;- red and light-green shale like the sample at 5777-5792 ft.; a few nodules of red and white sandy limestone. No change. No samples. Core 1. Recovery 8 ft. Top. Sandstone, light greenish-gray and pink, thinly laminated, very fine to moderately fine grained, argillaceous, highly micaceous (black and green flakes). The sand grains are usually . etched and roughly angular. Part of the sandstone has a white ashy(?) cement. Three feet from the top of the core, a streak of white soft sandstone is fine to very coarse grained and con~ tains small pebbles, the cementing material is white and ashy(?). Middle. Sandstone, light green, very fine-grained, micaceous. Bottom. Sandstone, light-green, fine to moderately coarse grained, micaceous, bentonitic. The sand grains are usuillly etched and roughly angular. l46 Depth (feet) 6024-6039 6039-6190 6190-6222 6222-6600 GEORGIA GEOLOGICAL SURVEY BULLETIN 74 ' Description Sand, unconsolidated, fine to moderately coarse grained, and a few fragments of red shale. Like the sample at 6024-6039 ft., with the addition of a few nodules of pink to red limestone. Sand, unconsolidated, fine to moderately fine grained; a few coarse sand grains and a few fragments of red and gray mottled shale' Sand, unconsolidated, fine to coarse-grained, quartz, and a little feldspar; many small fragments of dull, dark-red and gray mottled micaceous shale; a few nodules of red and pink limestone. 6600-6607 6600-6615 6615-6631 . 6631-6646 6646-6682 6682-6697 6697-6707 6707-6722 Devonian (?) Middle Devonian (?). Weathered (?) Shale. Core 2. Recovery 3 ft. Corrected depth 6630~6637 ft. Top. Shale, dull brick-red, sandy. The sand, which is fine to moderately fine grained quartz, constitutes about 10 percent of the fragment of core, and is rather evenly distributed. The .shale contains a small amount of mica, a few small inclusions of greenish-yellow unctuous clay, and molds and impressi.ons of small fossil bivalves. Middle. Shale, dark reddish-brown and bright greenish-bluestreaked, micaceous, somewhat silty, containing yellowish-brown inclusions. Bottom. Shale, greenish-blue and dull reddish-brown, silty, . splintery. Sand, unconsolidated, fine to coarse-grained, and fragments of the shale like core 2 at 6600-6607 ft. The sample contains one large fragment of white quartzite, and one of red-stained quartzite. Sand, unconsolidated; fine to coarse-grained (probably caving), and fragments of several types of shale, including fragments of smooth, splintery, flaky, reddish-bro'Yn and yellowish-greenstreaked shale. Like the sample at 6615-6631 ft and a few fragments of multicolored limestone nodules, that seem to belong nea~ this depth. Sand, like sample at 6615-6631 ft., and fragments of several types of multicolored shale and a few nodules of multicolored limestone. Sand and shale fragments like sample at 6646-6682 ft. , ~nd in addition, a few fragments of .bright greenish-blue bentonitjc_( ?) shale, and of red and gree~ish-gray, yellow-speckled, very fine grained sandstone. Sand and fragments of sevel'al types of red, brown and blue shale. Sand; unconsolidated, about 50 percent of sample, in contrast to 75-90 percent in samples about 100 feet higher in this well; the . sand is probably caving from higher levels. The sample contains various types of multicolored shale and many fl'agments of LOGS OF SELECTED WELLS iN THE COASTAL PLAIN OF GEORGIA 147 Depth (feet) 6722-6737 6737-6766 6766-6781 Description dark r eddish-brown and greenish-blue-streaked shale which was not observed in samples from higher levels; the shale contains traces of impressions of small fossils. Like sample at 6707-6722 ft., and in addition, a few fragments of. bright bluish-green, micaceous siltstone. Sand, shale, and siltstone like sample at 6722-6737 ft. Fragments of brownish-red and greenish-blue-streaked shale, green siltstone, and bright blue-green bentonitic(?) shale are common in the sample. Sand, unconsolidated, about 75 percent of sample. About 25 percent of sample is composed of fragments of several types of multicolored shale, green siltstone, and a f ew nodules of limestone. A fragment of black shale, which was not observed in -. samples from higher levels, is probably from near' this depth. 6781-6842 6842-6872 6863-6873 6872-6888 6888-6948 6948-6965 6965-6985 6985-7006 7006-7009 7009-7024 7024-7039 Devonian Middle Devonian. Black Sha~e. ,_ Like sample at 6766-6781 ft.; increase infragments of black shale. Like sample at 6781-6842. Fragments of dark reddish-brown, smooth, splintery shale, very common; a little black shale. Core 3. Recovery 0. Corrected depth 6893-6903 ft. Sand, unconsolidated, and multicolored shale like sample at 67666781 ft. Fragments of bluish-green shale abundant; dark brownish-red shale common; a few fragments of black, waxy shale. Like sample at 6872-6888 ft. A few fragments of black shale: a) smooth, flaky, splintery shale; b) rough-textured, mica- ceous shale having a conchoidal fractur'e. Shale, mainly brownish-red, reddish-brown and green, and a little black shale. Core 4. Recovery 20 ft: Corrected depth 6995-7015 ft. Top. Shale, dark-gray, smo'oth, thinly laminated, somewhat silty; in part, highly micaceous and highly pyritic (small crys- f tals); small particles of carbonaceous material. Another part of the core is dark-gray, hard, laminated, micaceous siltstone, containing minute particles of carbonaceous material. Middle. Shale, dark-gray, laminated, containing minute particles of carbonaceous material, and a few specimens of Lingula sp. Bottom. Like the middle part of the core. Core 5. Recovery 20 ft. Corrected depth 7015-7036 ft. Black shale containing specimens of Lingula sp. ' No sample. Sand, unconsolidated; multicolored shale, and black shale like core 4 (6965-6985 ft.) and core 5 (6985-7006 ft.) Like sample at 7009-7024 ft.; fragments of black shale more abundant. 148 Depth (feet) 7039-7221 7221-7251 GEORGIA GEOLOGICAL S URVEY BULLETIN 74 Description No change. .Samples contain much caved material. Sand, unconsolidated; fragments of multicolored shale, and black shale; a _little light-tan; dense, finegrained sandstone. Ordovician 7240 Lower . Ordovician(?). Quartzitic san~stone. (electric log correlation) .,_ 7251-7284 Like sample at 7221-7251 ft. Some fragments of the standstone are moderately coarse grained, and a few fragments seem to be quartzitic. 7284-7320 T.D. No samples. ECHOLS COUNTY Operator: Hunt Oil Company Landowner: Superior Pine Products Co. Well .#3 Location: Land District 13, Land Lot 532; 218 ft. east and 242 ft. north of southwest corner of Land Lot 532. GGS No. 150 Elevation: 144 ft. (derrick floor) Total depth : 4003 ft. Completed: July 29, 1947 Summary of Stratigraphy Tertiary Dept h Thicknes s (feet) (feet) Samples not studied Cretaceous Gulf Lawson Limestone, upper member ( ?) ___________ 2590 ( ?) Beds of Taylor age - - - -------------- -- ---- 2670 Beds of Austin age ---------"------------------------------ 2950 Atkinson Formation, upper member________________ 3320 . lower member ( ?) ______ 3465 Comanche(?) undifferentiated - ----- ---- - -------- 3625 80(?) 280 370 145 160 32 Ordovician to Middle Ordovician1 black shale and sandstone ______ 3657 total 346 depth 1 Bridge, Josiah and Berdan, j. M. 1951, U.S. Geological Survey open-file report, p. 6 and map. LoGS OF SELECTED WELLS IN THE COASTAL PLAIN OF GEORGIA 149 Lithologic and paleontologic descriptions of cuttings and cores. Samples are cuttings unless otherwise stated. nepth (feet) 0-2750 Description Samples not studied. Cretaceous Gulf Series Lawson Limestone. Upper Member(?). Top of the upper member ( ?) of the Lawson Limestone is placed at 2590 ft. on the basis of electric. log correlation. . Beds of Taylor age ,,,-. Top of the beds .of Taylor age is placed at 2670 ft. on. the basis of electric log correlation. - 2750-2.760 2760-2770 Chalk, white, containing abundant fragments of Inoceramus and other fossil bivalves, and many specimens of Anomalina sholtz- ensis and A nomalina cosdeni. Like sample at 2750-2760 ft. Pyrite and py~itized sheli fragments are . common. 2770-2820 . 2820-2830 2830-2840 No change. Like preceding sample~ with the addition .-of a little light greenish- gray marl. . Sample shows an increase in the light. greenish~gray marl. 2840-2850 Like preceding samples and many cavings(?) of light-tan dolo.mite and moderately fine-grained sand. The sand is about 50 percent of the sample. 2850-2860 2860-2870 Like sample at 2840-2850 ft. Chalk, white, tan dolomite, a little sand, and fragments of green~ ,, .l ish-gray inarl. The sample contains fragments of Inoqeramus and other fossil bivalves, echinoid spines, and a few specimens of Foraminifera and Ostracoda. , The microfossils seem. to wash ,from the chalk which is probably caving. 2870-2880 Like sample at 2860-2870 ft. 2880-2890 The sample is composed of about 50 percent light-gray and greenish-gray marl; the remainder is white chalk and a little dolomite. The sample contains abundant fragments of 'Inoceramus and other fossil biv!llves, echinoid spin.es, and a few specimens . of Foraminifera and Ostracoda. The microfauna seems to wash fro:qt the chalk which is probably caving. 2890-2940 No change. 150 Depth (feet) 2940-2950 2950-2960 2960-2970 2970-2980 2980-2990 2990-3000 3000-3010 3010-3060 3060-3070 3070-3100 3100-3110 3110-3180 3180-3190 3175-3185 3185-3195 GEORGIA GEOLOGICAL SURVEY BULLETIN 74 Description Marl, light gi:eenish-gray, chalky, is the largest part of the sample. in addition, the sample contains a little chalk and tan dolomite, fragments of Inoceramus and other fossil bivalves, and a few specimens of Foraminifera, all of which seems to have caved t from higher levels. Beds of Austin age Like sample at 2940-2950 ft., with the addition of a few fragments of a somewhat darker greenish-gray laminated marl. The top of the beds of Austin age is based in part, on electric log corr~ lation. Like sample at 2950-2960 ft. The sample is mainly chalk, and a few fragments of marl and dolomite; a few Inocera-mus fragments. Marl, light-gray, chalky, is again dominant. Fossils are, chiefly, fragments of Inoceramus and other macrofossils, and a few specimens of Foraminifera from higher levels. No- change. Like sample at 2980-2990 ft. The marl is somewhat softer, and microfossils are fairly well preserved. The microfauna contains specimens of Globotruncana sp., Globotruncana marginata, Planulina austiniana, Citharina texana, and Marginulina cf. M. plummerae. No change. Marl, gray, and a few fragments of brownish-gray, somewhat light-speckled marl; contains specimens of Foraminifera like sample at 3000-3010 ft., and a few specimens.of ostracodes. No change. Marl, darker gray, somewhat light-speckled; nodules of pyrite and pyritized fragments of Inoceramus are common. Microfossils are, chiefly, specimens of Globigerina sp., Globotruncana marginata, a few specimens of Globorotalites un~bilicatus, and a few specimens of ostracodes. No change. Like the sample at 3100-3110 ft., and about 50 percent cavings ( ?) of fine to moderately coarse grained sand. ,; Core. Recovery 10 ft. Top. Chalk, gray, marly, somewhat light-speckled. The slightly speckled appearance is due to crushed fragments of fossil sliells. The marl contains fragments and prisms of Inocera-mus and .a few fish scales. ' Core. Recovery 10 ft. Top and bottom. Chalk, marly, as in core at 3175-3185 ft. A washed sample at the top part of the core contains specimens of Globigerina sp. and Globotruncana marginata that are common in the lower part of the beds of Austin age. -~ LOGS OF SELECTED WELLS IN THE COASTAL PLAIN OF GEORGIA 151 "'.: Depth (feet) Description 3195-3200 Core, Recovery 10 ft. Top. Chalk, brownish-gray, marly, light-speckled. More highly speckled than the core at 3_185~3195 ft. Bottom. Like top part ofthe cote, but softer and more shaly. 3200-3210 Marl, gray, somewhat light-speckled, like the preceding cores. Nodules of pyrite and fragments of Inoceramus are fairly common. 3210-3230 No change. 3230-3240 Core. RecoverS' 2 ft. Marl, light brownish-gray, somewhat light-speckled, chalky, containing shreds of carbonaceous material. The sample of cuttings from the same depth as the core contains specimens of N onionella austiniana. 3240-3250 Sample not described. 3250-3252 Core. Recovery 1% ft. .: ~ . Like core at 3230-3240 ft." 3252-3262 C,,- o. re. Recovery 10 ft. Top. Chalk, light brownish-gray, marly; contains a few shreds . of carbonaceous material. Middle. Like top part of .the core; contains fragments qf /no. ' ceramus , much fragmental, calcitized microfossilerous material, '" and sp~Ciinens of Globigerina sp. (common). 3262-3268.... Bottom. Like middle part of the core, but i:nore shaly and more highly speckled with crushedyellov:, chalky fossil rnaterial. . Core. Recovery 6 ft. .... . Top. M~rl, light tan-gray, chalk~. , . ~ p:~ BottQm. Like 'top part of . the core; contains fragments of Inoceramus and small fragments of calcitized microfossils. This kind of material commonly occurs in the lower part of the beds of Austin age. 3268-327.8 -l -: li 3278-3288 " Core. Recovery 5 ft. ,' Top. Like core at 3262-3268 ft., but not as well consolidated. . Bottom, Marl, light tan-gray, soft; chalky. ' Core. Recovery 10 ft. Top. Marl, brownish-gray, yellow-speckled. '. Bottom. Marl, like top part of 'core; chalky. 3288-3297 .. 3297-3300 .Core. Recovery 8 ft. Top. Marl, tan-gray, containing darker bands or lamjnations of the same material; speckled with crushed, chalky, dark-stained, fragmental fossil shells, Bottom. Like 'top part of core. ' Co~e. Recovery 3 ft. '' -~ Top, Like core at 3288-3297 ft., bu.t less highly speckled, and, in " part, bard; white chalk.- The ' marl is somewhat carbonaceous. 152 GEORGIA GEOLOGICAL SURVEY BULLETIN 74 Depth (feet) Description Bottom. Marl, brownish-gray, moderately hard, chalky, some~ : i what light:speckled. i: 3200-3310 .' , Core. Recovery 10 ft. Top. Not described or no sample. Bottom. Like core 3297-3300 ft. 3310-3320 core. Recovery 10 ft.: Top. No sample? . Middle. Chalk, white, hard, highly sandy. Sand is at. least 50 percent and possibly 75 per cent of the sample. .. ':: . ,, ,,. . Bottom. Sandstone, light-tan, fine to moderately fine grained, ' ,., ,.. higlUy pyritic, containing lenses of grayish-green shale. 3320-3328 f. Atkinson Formation. Upper Member. . . \ . > . :: {) ~. :., - '.. . The top of the Atkinson Formation may be .at the middle part of the core at 3310-3320 ft. ' _.,.. ,, :- : ~ Core. Recovery 7 ft. . ,_ ~ . ... Top. Shale, grayish-green, containing lenses ~nd 'inclusions of light-gray, fine-grained sandstone: . ' ' Bott?m ~ike top part of core. ~328-?,338 3320-3340 3340-3350 , '1 .. . Core. Recovery 6 ft. Top. Clay, grayish-green, mo~erately. ~oft, : highly silty, ir.regu- la:i-ly sandy, micaceous. Botto'm. Siltstone, light g~ayish-green, moderately soft, mica- ceous; and highly argillaceous.., - . Like the cores at 3320-3328 ft. and 3328-3338 ft., and cavings from higher levels: r; . . . Shale, grayish~green/ flaky, and 1fragtrtents of s'a,ndstone that may ' sp. .-' occur al(lenses in-the shale. Th~ sandstone contains fragments ' ' of Ostrea 3350-3360 3360-3410 " Not described. Like sample at 3340-3350 ft.; mainly sh?,le"'and a little '~t'ifd:) 3410-3430 3430-3440 Not described. :, 1 ' ' .. ' . . .. ~ Shale, grayish:green, flaky, somewhat micaceou:;;, and a little green- ish-gray micaceous siltstone that may occur as lensei in the shale. .The sample .contains '8 ' few specimens of very small Gumbelina sp. and Globigerina ,sp. ,(common in the Eagle Ford' Shale in Texas), and a few fragments of fish bones~ and car- bonac.eous ]paterial. 3440-3450 . :...-No- change. ' .. . . :. .,.t ., . 11 ,:. . . . ,., ,1,..,. . . ' . --'" _ 3450-3460 Shale, 50 percent; siltstone 50 percent.!<'Shale contains a few speci- mens of Gumbelina sp., Globiger:ina sp., and Planulina eaglefor- densis. small, brown, irregular-shaped ..nodules of . siderite. are , ! ~n th~ sample. 4 \: '~"' ' - .~ 1 . .. . 3460-3470 \,. Shale, :grayish-green, flaky, and micac_eous siltstone. LOGS OF SELECTED WELLS IN THE COASTAL PLAIN OF GEORGIA 153 Depth (feet) Description Atkinson Formation. Lower Member. 11470-3480 8480-3490 3490-3500 ~500-3510 3510-3520 The top of the lower member ( ?) of the Atkinson Formation is questionably placed at 3465 ft. -oli the basis of electric log correla- tion. Like sample at 3460-3470 ft. The shale contains crushed !"ragments of chalky shells and specimens of Foraminifera; the species are not identifiable. Shale, greenish-gray, flaky, and many fragments of cream, fine- grained sandstone. Shale, green, flaky, and a little sandstone and siltstone. Like the sample at 3490-3500 ft., and a few specimens of Planulina eaglefordensi8, Gi.imbelina sp., and Globigerina -sp. No change: . . 3520-3530 No sample? 3530-3540 Shale, green, flaky, and a few fragments of light greenish-gray, poorly-sorted, fine to moderately coarse grained sandstone. 3S40-3550 Like sample at 3530-3540, but showing an increase of sand; a few green-tinted moderately coarse grains. 3550-3560 Shale, green, flaky; a little siltstone. Shale contains small, crushed, . ~ .: white specimens of unidentifiable microfossiis. S560-3S70 ,. Like sample at 3550-3560 ft. . i 3~70-3580 .., . Shale and siltstone like the immediately precedjng samples. A little . . . _. ,._ JIJ'.'''' ,- fine to coarse~grain. ed, so:ft; glauconit.ic.sands'.tone. 3580-3590 Like sample at 3570-3580 ft. . : r . ... . ' '3590-3600 .,. Sl:!ale, green'; flaky, somewhat silty; a little sand, and a little car- .. bonaceous m ~. a t e r ' i.a..l ; a few. fragments . of a thin-shelled lnoce- ramus. '.? 3600-3610 Shale, and a few fragments of siltstone and sandstone. ,. . 3603-3623 .... " Core. ~ecovery 13.3 ft. . : ' -\. . ~" - . ."-\l~ . -4th 4 ft. Siltstone, light-gray, 'moderately hard, micaceous, argil- laceous, containing thin lenses cif white, hie-grained, glauconitic 'sandstone. Glauconite occurs in very small nodules. The sample contains a little siderite. ' - J. :.., .... , :~ !r ' . "'! 3625-3635 . . Core. Recovery 4 ft. Top. Sandstone, brownish"r.ed,' argillaceous, micaceous, poorly sorted, fine to coarse-grained. ' ,. ' .. i' -.'. Bottom. Clay; 'red arid mustard mottled, moderately ha'rd-;contains scattered, fine to coarse' quartz grains. 3635-3645 Core. Recovery 1 ft. J,.:. . "I : Sand, mottled red and mustard. C:Iay like the bottom of core at 3625-3635 ft. ;. .. 154 QEORGIA GEOLOGICAL SURVEY BULLETIN 74 . D epth (feet) 3645-3655 3655-3665 Description Core. Recovery 2.! ft. Top 1 ft. Sandstone~ red and gray, soft, fine to moderately fine grained, argilla~eous, micaceous. Middle 1 .ft. Sand, red, soft, argillaceous. Bottom 72 ft. Sandstone, red, and red and greenish-yellow mottled clay. Core. Recovery lh ft. Top 3 in. Sand, soft, fine to coarse-grained,quartz, in matrix of red clay. Bottom 3 in. Sandstone, light-red, pale-green and white mottled, . fine-grained, highly argillaceous (possibly ashy) ; contains one large.pebble of quartzite. Ordovician Middle Ordovician Series The top of the Paleozoic is placed at 3657 ft. on the basis of electric log correlation. The samples from 3657 to 3735 ft. are possibly weathered Paleozoic rocks. 3665-3667 C.ore. Recovery 2 ft.. Top. Clay, brownish-red and yellowish-green mottled, hard, ir- regularly sandy, highly micaceous; contains a fragment of a fos- sil bivalve. . -4. ;'V Bottom. Like the top part of core. Re~ _clay with light greenish- gray streaks. 3667-3672 Core. Recovery 4 ft. Top. . Clay, shaly, red, moderately hard, highly micaceous. , i . Bottom. Clay, shaly, red, gray and greenish-yellow streaked, highly micaceous. 3672-3680 Core. Recovery 6 ft. Top. Clay, shaly, like the core at 3667-3672 ft. in lithology and color, but highly sandy (fine-grained sand); might be classified r. as an argillaceous sandstone; cont~ins a mold of an unidentified ; ; microfossil. Middle. Clay, shaly, red, highly micaceous. Bottom. Shale, red, showing yellowish-green and light bluish- gray streaks, and irregular areas of sandy shale. 3680-3685 Clay, shaly, red, and sandy mi~aceous clay and red sandstone like 1. ., preceding cores; ab.out 50 percent of the s~mple is composed of ~ I cavings of different kinds of material fro~ higher levels. 3680-3685 3685-3690 Like the preceding sample from the same depth. Also conta~ns a few ~ragments of a white and pink, hard, dense, fine-grained, quartzitic sandstone. / . ' . . Like the sample at 3680-3685 ft.; red shale, sandstone, and quartz- itic sandstone. LOGS OF SELECTED WELLS IN THE COASTAL PLAIN OF GEORGIA 155 Depth (feet) Description 3690-3695 Like the sample at 3685-3690 ft.; but containing little quartzite. 3695-3700 Like the sample at 3690-3695 ft., and many fragments of purplishred, very fine grained, moderately hard sandstone. 3700-3720 No change. 3720-3725 . Mainly cavings of light purplish-red, hard, fine-graine.d sandstone, and a little light-green sandstone. 3725-3735 Clay, red, micaceous, sandy, and light purplish-red .and light-green, hard, fine-grained sandstone; a few fragments of quart:l:ite. About 50 p ercent of the sample is cavings from higher levels. 3735-3740 Like the sample at 3725-3'735 ft., with the addition of a few frag- ments of black, unctuous, highly micaceous shale and hard black sandstone. This sample is probably the top of the unweathered Paleozoic rocks. - 3745-3795 No change. 3790-3795 Cuttings are a mixture of red .shale and sandstone, and materials from the Atkinson Formation; also, cuttings of the black, micaceous shale and black shaly sandstone of the Paleozoic. 3795-3800 Like the sample at 3790-3795 ft., and many fragments of light greenish-gray, hard, micaceous sandstone that is possibly interbedded with the black shale and the black, shaly, highly micaceous sandstone of the Paleozoic. 3800-3895 No change. 3892-3895 Core. Recovery 2 ft. Sandstone, light greenish-gray, very dense, very fine grained, quartzitic sandstone containing thin partings. of black, highly micaceous, unctuous shale. - 3900-3905 Sample at least 75 percent cavings from much higherlevels; also fragni~ntS of the black shale arid sandstone like core at 3892-3895 ft. 3905-3950 No change: 3950-3955 Cavings about 50 percent. The remainder of the sample is fragments of the black-shale-streaked sandsto'ne described in core at 3792-3795 ft. 3955-3965 No change. 3965-3970 Siiuilar to the immediately preceding samples, but with few fragments of the black shale, arid many fragments of the light--green to white, highly micaceous, hard sandstone. 3970-3990 No change. 3990-3995 This sample shows an increase in the amount of black, micaceous shale and the gray micaceous sandstone. 3995-4003 T.D. No change. 156 GEORGIA GEOLOGICAL SURVEY BULLETIN 74 ECHOLS COUNTY Operator: H~nt Oii Company GGS. No. 158 Landowner: Superior Pine Products Co. Elevation: 156ft. (derrick Well4 floor) Location: Land District 13, Limd Lot Total depth:_3916 ft. 219; from Northwest corner of Land Completed: Mar. 16, 1948 Lot 219, go 1978 ft. east, thence 1106 ft. S. go W. to location. ' Summary of Stratigraphy Tertiary Depth (feet) Thickness (feet) at Paleocene -------------------------~-------------------- .? In beds containing Tamesi fauna 2600.ft~ ? Cretaceous Gulf Lawson Limestone, upper member_________________________ 2610 ( ?) 70 Beds of Taylor age ------------------------------------------------------ 2680 270 Beds of Austin age ---------------------------------------~----- 2950 322 Atkinson Formation, upper member__________________________ 3272 .168 " lower member__________""------------- 3440 189 Comanche undifferentiated -------------------------------------- 3629 282 Ordovician , . . , . , . . ,,j to Middle ' Ordovician1 weathered ( ?) . zone --~---------------- 3911 total 5 t . depth f" ~ithologic and paleontologic descripti_ons~ of C':!rt:. tmgs and cores. Samples are cuttmgs unless '' 1 otherwise stated. ., ' ) .-:. ?t!i~ ~ .,.., Description 0~262~ Samples nof studied. ..,; Cretaceous Gulf Series . .r .. .w ,.. .~: Lawson Limestone. Upper Member. ~. 2610 ( i) The top of the upper member of the Lawson Limestone (upper- is most Cretaceous) provisionally placed at 2610 ft. on the basis of electric log correlation_. . . ... ~Bridge, Josiah and Berdan, J. M. 1951, U.S. Geological Survey open-file report, p; 5 and map. LOGS OF SELECTED WELLS IN THE COASTAL PLAIN OF. GEORGIA :157 D ep th (feet) rDescription 2620-2630 Sandstone, greenish-gray, fine and even grained, highly glauconitic, i- _calcareous, containing many specimens of. Glo~orotalia velascoen- 2600-2610 sis, Globigerina triloculinoides, a small form of Ci bicides sp., (est.' depth) 2630-2640 (2610-2620 and other small Foraminifera.2 Limestone, cream, hard, calcitic, gypsiferous, containing poor_ly- preserved molds and fragm~nts of maids of inacrofossils and a est. deptl:l) few microfossils. 2640-2650 ( " ' .", ., Limestone, cream, chalky, composed, .mainly, of a mass of p~~;ly preserved molds of microfossils arid a few macrofossils. The . - ~ ' ~ i. ~ . ,. :~ microfauna in this sample is unusual, and is somewhat similar .L ' to the fauna that has been reported from the "Upper Cretaceous" beds in Trinidad; also, it contains 'several species occurring in the upper member of the Lawson Limestone in a few wells .in Florida; and even seems to have certain Tertiary aspects. . 2650-2660 ,J'I . ; .. of Limestone, . light7cream, somewhat gypsiferous, containing frag- ments poorly preser:ved molds of fossils. The character of the material is somewhat li~e sample at 2640-2650. Amo-ng the un- , usual features, is a mold of a Borelis-like form in a fragment of > the limestohe, and a fragillent showing distinct coralline .struc- ture. 2660-2670 Like sample a".2650-2660 ft., but contains more traces of molds and impressions of microfossils. 2670-2680 Like sample at 2660-2670 ft. A few fragments are highly pyritic, and a few others snow a trace of glauconite. ..-' .! Beds of Taylor age ! 2680-2690'; ;chalk, white, glauconitic:' The fauna is composed of fragments of . of In~;~ceramus, a few specimen~ 6I Ostracod~, and many speci- mens of Anomalina sholtzensis, Arunnalina cosdeni, Globotrun- . -~ . cana area, Bolivinoides decorata, Globorotalites conicus. Like sample at 2680-2690 ft. Ino~eramus fragments and prisms . 2700-2720 27207~7~0 abundant. ' ',J!. No change, but few well-preserved specimens of' Foraminifera,.and l' a decrease of glauconite. ~ ,. .. : .. . . . .~ . . . J: :l] Chalk, white, Inoceramus fragments and a few specimens th shown by the electric log characteristics and the depth of the hole at the time the samples were taken, we suggest .a lag in theaeturns amounting t o about 20 feet . On this . basis, the estimated corrected deJ>th of this sample would be 26002610 ft. and the estima-ted corrected depth of the next deeper sample .would b e 2610-2620 ft. 158 Depth (feet) . GEORGIA GEOLOGICAL SURVEY BULLETIN 74 Description ' . . #. molds of microfossils and macrofossils). The chalk is somewhat speckled with small grains of dark-green, glauconite and of py- rite; some fragments of chalk are highly pyritic. 2740-2750 Chalk, white; and a little gray marly chalk. -The sample contains Inoceramus fragments and prisms, and a few specimens of long- /. ranging species of Foraminifera. 2750-2800 Like sample at 2740-2750 ft. 2800-2810 Chalk, white, Inoce?amus fragments and prisms, many large nodules of pyrite, and a few specimens. of Foraminifera. ' 2810-2820 Chalk, white, many fragments of Inoceramus and other fossil bi- valves, a f ew specimens of F oraminifera, and a few fragments of light olive-gray marl. r 2820-2830 Like sample at 2810-2820 ft. 2830-2840 Chalk, light olive-g1ay, and about 25 percent gypsum. 2840-2850 . Chalk, light-gray, marly; abundant Inoceramus prisms, and a few specimens of Foraminifera and Ostracoda; also a few fragments of gypsum, which may be caving. 2850-2860 Like the sample at 2840-2850 ft.; Anomalina sp. is the common species of Foraminifera in the sample; no gypsum. 2860-2960 No change. 2960-2980 2980-2990 2990-3000 3000-3100 3100-3110. 3110-3180 3180-3190 Beds of Austin age The top of the beds of Austin age is pl;~ed at 2950 ft. on the basis of electric log correlation. Chalk, white and light-gray, soft, and a few fragments of harder, light-speckled, olive-gray chalk. The sample contains abundant Inoceramus prisms, fragments of Inoceramus and other fossil bivalves and a fe~ specimens of Foraminifera. Chalk, dark-gray; marly; contains abundant hwceramus prisms,' abundant specimens of Foraminifera, and several species of Ostracoda. The common foraminiferal species are: Globotrwn- cana spp. Globigerina sp., Planulinasp., Planulina austiniana, a few specimens of Valvulineria in{re'qtens, Planulina texana, Giimbelina sp., Robulus sp., and Kyphopyxa christneri. The sam'- ple is definitely Austin in age. Like the sample at 2980-29~0 ft.; contains specimens of Citharina t ex ana. ,-_ No change. I Chalk, gray, ' somewhat white-speckled, marly containing many Inoceramus prisms and Austin species of Foraminifera. No change. Core 5. Recovery 8 ft. Top 3 ft. Marl, gray, somewhat white-speckled (micr~fossili ferous). No chitnge .in fauna. l Middle 2 ft. Marl, so~ewhat lighter in color. LOGS OF SELECTED W:ELLS IN THE COASTAL PLAIN OF GEORGIA 159 D epth (feet) 3190-3200 . 3200-3210 3210-3215 3215-3224 3224-3234 3234-3244 3244-3250 3250-3255 Description Bottom 3 ft. No change. Core 6. Recovery 4% ft. . Top 3 ft. Chalk, gray, marly, containing Austin species of Fora- minifera; Giimbelina sp. common. . __ _ Bottom 1% ft. Like top part of core, but slightly darker. Core 7. Recovery 4% ft. Top 1% ft. Chalk, light-gray, marly; no change in fauna. 2nd 1% ft. Marl, dark-gray. 3d 8 in. No change. Bottom 10 in. Marl, lighter gray. Core 8. Recovery 5 ft. Top 4 ft. Like the bottom part of Core 7 at 3200-3210 ft. Bottom 1 ft. Slightly darker marl; no change1 in fauna, but . specimens of Foraminifera less abundant. Core 9. Recovery 9 ft. Top 3ft. Chalk, light-gmy, moderately 1'\ard. No change in micro- fauna. ,~ 2nd 3 ft. M~,r,..l., dark-gray, light-sp.eckled, containing fragments of fish scales, a few fragments of Inoceramus and specimens of Foraminifera. 3d 1 ft. Chalk, white, marly, moderately hard. No change in microfauna. 4th 2 ft. Marl, gray, some~hat white-speckled, containing frag- ments of fish scales and a P ecten-like bivalve. Dominant species. of Foraminifera are: Gumbelina sp., Globige?-iM sp., and a small Anomalina sp. ' ' Core io. Recovery 10 ft. Top i ft. Like the bottom part of core 10 at 3224-3234 ft. Globo- truncana sp. common in the fauna. 2nd 2ft. Chalk, light and dark-gray, marly; contains fish scales; no change in microfauna. 3d 3% ft. Marl, dark-gray, light-speckled. Bottom 3% ft. Chalk, white, moderately hard, no change in . microfauna. ' Core 11. Recovery 3% ft. Top 2 ft. Like bottom part of core 10 at 3224-3234 ft. Bottom 1% ft. Marl, gray, soft; no change in microfauna. Core 12. Recovery 2ft. Chalk, white, moderately hard, common species of Foraminifera are: Globigerina sp., Gumbelina sp., Pleu1ostomella sp. Core 13. Recovery 5 ft. Top. Chalk, gray, somewhat light-speckled, marly; Microfauna like core 12 at 3244-3250 ft. Bottom. No change. >~:< _:: : - -. 160 GEORGIA GEOLOGICAL SURVEY BULLETIN 74 :.os : >\. I Depth (feet) 3255-3265 ,,.. 3265-3272 Description Core 14. Recovery 3 ft. Top 1 ft. Like core 13 at 3250-3255 ft. Bottom 2 ft. No change. Core 15. Recovery 3.! ft. Top. Marl, gray, white-speckled, and lens of light-gray chalk containing much comminuted calcitic, chalky debris of micro::~ fossils and macrofossils. No change in microfauna. Bottom. Chalk, light-gray, moderately hard, and dark-gray, white speckled marl. 3272-3277 3277-3285 3285-3287 ' ,, 3287-3297 3297-3307 Atkinson Formation. Upper Member. ! Core 16. Recovery 1 ft. Shale, dark greenish-gray, flaky, unctuous, Core seems to be contaminated with drilling mud; no definitely indigenous specimens of Foraminifera ob.served. , Core 17. Recovery 3 ft. Top. Shale, green, containing irregular vein-like silty streaks, and a few rounded, moderately coarse grains of quartz. The a sample contains few fragments of fine-grained, somewhat glau- conitic sandstone, and a few fragments of Ostrea-like fossil bi- valves. Middle. Shale, green, flaky, interbedded with light-gray, mica- ceomi', slightly glauconitic siltstone; contains a few small speci- mens of Planulina eaglefordensis. Bottom. Siltstone, gray, soft, micaceous, iriterlensed with green _shale; contains a few phosphatic fragments, a few shreds of carbonaceous material, and pyrite; a few small specimens of Planulina eaglefordensis. Core .18. Recovery 2 ft. Shale, green and light greenish-gray, argillaceous, micaceous, and very fine and even grained, soft sandstone, in thin alternating layers. The material contains a little phosphatic material and glauconite; a few carbona-ceous shreds. The fauna is com.: posed of shell .fragments. Ostracodes, abundant specimens of. .Planulina eaglefordensis, Globigerina sp., and others. Core 19. Recovery 6 ft. Top. Sandstone, ., light greenish~gray, soft, v~ry fine ~ained, argillaceous, mi~aceous, containing very thin partings and streaks of green shale; phosphatic nodules and traces of glauco- nite and pyrite. Middle. No change. Bottom. No change. Core 20. Recovery 9 ft. , Top 4 ft. Siltstone, light greenish-gray, micaceous, finely glaucoL nitic, containing very thin lenses of green shale; a few frag- LOGS OF SELECTED WELLS IN THE COASTAL PLAIN OF GEORGIA 161 Depth (feet) Description ments of carbonaceous material, phosphatic material and worn shells. :, 2nd 2 ft. Like the top part of the core, but containing much . glauconite. _Bottom 3 ft. Shale, green, flaky, and lenses of micaceous siltstone. 3300-3310 Shale, green, a little micaceous .'siltstone, and cavings from higher k~L . : - 3310-3330 No change. 3330-3340 Shale, and many cuttings of moderately hard, .fine-grained, some- what glauconitic, micaceous siltstone that contains phosphatic nodules and fragments of lignite and shells of Ostrea--like bi- valves. -. 3340-3350 3350-3360 3360-3370 3370-3380 3380-3390 3390-3400 3400-3410. Like sample at 3330-3340 ft. Sandstone, greenish-gray, containing abundant fragments of Ostrea-like bivalves; glauconite and phosphatic nodules (fairly common); a little green shale. Sandstone, s_hell -fragments and phosphatic nodules; many fragments of green shale; a little glauconite and mica. Sandstone and sand, fine-grained, quartz; many fragments of Ostrea sp.; a little 'shale, a little inica, and a few phosphatic nodules. No change. Sand, fine-grained, even-grained, micaceous; containing many fragments of Ostrea sp. and other fossil bivalves; a few fragments of green shale; a few phosphatic nodules and fragments of carbonaceous material. Like sample at 3390-3400 ft. 3410-3430 Sand,' mica, and fragments of green shale; shell fragments much less abundant; a few fragments of carbonaceous material, and a trace of gl!iuconite. - 3430-3440 Like sample at 3410-3430 ft., but green shale more abundant. 3450-3460 3460-3470 3470-3490 3490o3500 Atkinson Formation. Lower Member. Material like sample at 3410-3430 ft., but contains specimens of Reophax pepperensis, A mmobaculites agrestis, A. iunceus, Trochamn~ina rainwateri, and ~thers. Shale, green, micaceous, and fine-grained sand; a few fragments of carbonaceous material and a few shell fragments. Shale, grayish-green, and a little silty, micaceous shale; a little fine-grained sand, probably caving. The sample contains a few fragments of carbonaceous material and of shells. Like the sample at 3460-3470, and a few fish teeth and fish bones. Similar to the samples at 3470-3490 ft., but fragments of very tJ 162 GEORGIA GEOL Like sample at 3400-3410 ft. Like the sample at 3400-3410 f t ., and y, mimy - cuttings ; ' of ~ream, ' chalky, highly microfossiliferous limestone ~ontaining abundant comminuted calcitic molds of small specimens of Gum.belina sp. and Globigerina sp. Sample also contains hr.oceraniU.S prisms and fish scales. . '" .. : Like the sample at 3420-3430, and .many caVings. Mainly fragment~ of greenish-gray marl, ~nd a ' few frakment~ - of highly microfossiliferous chalky limestone. Many cavings from much higher depths. ~ .Like the sample at 3440-3450 ft. --A few fragmel)tS of the highly microfossiliferous chalk contain sandy areas. ' j " - ....... -~~, ~~ ... .. '., .' .it J . . au . I .4 .1&.LJ .2,I Lsc.. LOGS OF SELECTED WELLS IN THE COASTAL PLAIN OF GEORGIA 169 Depth (feet) Description Atkinson Formation. Upper Member. 3460-3470 Sandstone, fine-grained, angular, clear quartz, containing glauconite, phosphatic nodules, mica and pyrite, is 'about 50 percent of the sample. The sandstone also contains fragments of fossil bivalves. Cavings are about 50 percent of the sample. 3470-3480 Sandstone, like the sample at 3460-3470 ft., and abundant frag- ments of green, thinly flaky shale. Sample contains a few fragile specimens of Pwnulina eaglefordensis. 3480-3490 Shale, grayish-green, thinly flaky, slightly micaceous, and fragments of very fine and angular grained, micaceous, carbonaceous sandstone that is probably interbedded with the shale. 3490-3500 Shale, like the sample at 3480-3490 ft., and much light-gray, micaceous siltstone that probably occurs as thin lenses in the shale~ 3500-3510 Shale, like the sample at 3480-3490 ft., and a little siltstone. 3510-3520 Shale, about 75 percent of sample; soft micaceous 'siltstone about . 25 percent. 3520-3530 No change. 3530-3540 Shale, gray-green, micaceous; J!lso a little soft.micaceous siltstone, and very fine grained sandstone, both of which are slightly carbonaceous. 3540-3550 Like the sample at 3530-3540 ft. The shale is more micaceous, and J is slightly carbonaceous. -; 3550-3560 Like the sample at 3540-3550 ft. The shale contains small, crushed, chalky fragments of fossil shells; ~ few specime~s of flanulina eaglefordensis, and very small irregular-shaped nodules of sider- ite. 3560-3570 \ , , 3570-3580 ,__... Material like the sampl'e at 3550-3560; but contains no determina- 1 , ble f?.ssils; R.ed~ish-b~own, irregula~-~hap~~ nodules of . siderit~e_ are common m some .fragments.. o~ siltstone. Like the sampl~ at 3560-S570 ft.' . '' "' . ... , }-- "": AtkinS.OO: Formatio~. ' t~~er Mem~r. 3580-3590 . Like the sample at 3560-3570 ft. The shale contains a few molds .>. <- ''' " of macrofossils and 'fragments of fish bones. The top of the lower member of the 'Atkinson Formation is placed at 3578 ft. .'-' ~ on the basis of electric log correlation. Jj::arlier workers reported . a microfauna c'haracteristic of , the lower Atkinson at the depth of 3778 ft., but at the 'time of this study, the samples contained no fossils. 3590-3600 Mainly shale and a little siltstone; no identifiable microfossils or. macrofossils. 3603-3623 Core. Recovery ? Top. Sandstone, brownish-gray, hard, calcareous, argillaceous, slightly glauconitic; sample is, in part, a nodular(?) .sandy limestone. 170 Depth (feet) 3620-3630 3623-3642 3630-3640 3640-3650 3650-3660 3660-3670 3670-3680 3680-3690 3690-3700 3700-3710 3710-3720 3720-3730 .. . :., 1 .. , .r . .. ; . '-. 3730-3740 ' 3740-3750 3750-3760 3760-3770 3770-3780 . . . ' ' 3780-3840 3845-3856 3840-3850 GEORGIA GEOLOGICAL SURVEY BULLETIN 74 Description Middle. Sandstone, ~an-gray, moderately hard, highly argillaceous, glauconitic, somewhat micaceous. Bottom. Sandstone, gray, soft, fine-grained, highly argillaceous, micaceous, glauconitic. Like cuttings at 3590-3600 ft. Core. Recovery 4 ft. Top. Clay, gray, silty, highly micaceous, slightly glauconitic. Bottom. Like top part of core, but slightly carbonaceous. No change in cuttings. No change. A few specimens of Planulina eaglefordensis, and a small Gumbelina sp. No change. No determinable fossils. Shale and a little micaceous siltstone; also many fragments of moderately soft, moderately fine-grained sandstone. No sample? Sandstone, poorly sorted, fine to coarse-grained; green-tinted grains common. Sandstone, moderately fine to coarse-grained, slightly argillaceous, somewhat glauconitic, about 50 percent of sample; 50 percent grayish-green shale. ~ainly flaky gray-green shale; a little sand and sandstone. Sand, fine to coarse-grained, and soft sandstone 50 percent of sample; green-tinted grains common; a little feldspar. Like th~ sample at 3710-3720 ft. r...: .' l; -~ Ordovician , Lower Ordovician Series Like sample at 3710-3720 fr and many fragments' of light to dark- red :fine-grained quartzite. . ...:rj No change. ;. Quartzite, red to light-pink, fine-grained, and moderately hard sandstone. In addition~ the sample contains many cavings of grayish-green, flaky; micaceous shale, and ; gray, micace{)u:;;, iJ:.~; regularly carbonaceous : siltstone and very ' fine g:r:ained. sand~ stone. Like the sample at 3750-3760 ft., but :very little quartzite. ,_. Shale and sandstone, like the sainples froni the Atkinson Forma- tion; very little quartzite. ' . Like the sample at 3770-3780 ft. Core. Recovery 4 ft. Sandstone, quartzitic, dense light gree.nish-gray, fine-grained, irregularly highly micaceous. Sandstone; qtiartzitic, light greenish-gray, micaceous, like core at is 3845-3855 ft., about 50 percent of sample. The remainder o{ (I the sample is mainly. cavings. . ~ LOGS OF SELECTED WELLS IN THE COASTAL PLAIN OF GEORGIA 171 D epth (feet) Description 3850-3900 Like sample at 3840-3850 ft. 3900-3910 Sandstone, dense, light-green, very fine grained, micaceous; a few fragments of red quartzite, and cavings from the upper Atkinson. 3910-3980 No change. 3980-3990 Like the samples f1om 3900 to 3980 ft. , with the addition of a few fragments of red and reddish-brown quartzite. 3990-4062 T.D. No change. ECHOLS COUNTY Operator: Humble Oil & Refining Co. Landowner: Bennett and Langsdale Well 1 Location: Land District 12, Land Lot 146; 660 ft. south and 666 ft. east of northwest corner of Land Lot 146 GGS. No. 189 .Elevation: 181 ft. (derrick floor) Total depth: 4185 ft. Completed: May 6,'1949 Summary of Stratigraphy Tertiary Paleocene In beds containing Tamesi fauna; 1st sample 2700 ft. ----~------------~--~----~-~------------ Depth (feet) ? Thickness (feet) ? Cretaceous Gulf Beds of Taylor age -------------------~-~~-------!_________________________ 2810 240 Beds of Austin age _ _________:_____________________ 3050 290 Atkinson Formation, tipper member_ _ __________ 3340 210 ;J. :.., lower . member_~---: -----~-- . 3550 210 Comanche undifferentiated ,. -"------C__.______:_~--~-----------::________ 3760 360 SUurian ~Qpper Siluria_n1 q~artzitic sandston~ ____7_------------~-- to 4120. total 65 ..,. .. ,, _ , . . depth . }:..~ Di3.base intrusion2 ---------:--- -----:----- 4125-4150 'i . . 'Bridge, Josiah ; and B erdan, J . M. 1951, :U.S. Geological Survey open-file report, p. 7 and m&p , tentatively classified the age of the quartzitic s andstone and da.rk shale as Early Ordovician. J. M. Sehopf (written communication to J . M. Berdan, February 19 59 ; written communication to P . L. Applin, July 1963), U .S. Geological Survey, classified the age o! the r ock s as Silurian on the basis of "acid resistant" m icrofossils in the sample at 41 7 1 ft. 2Applin, P. i..., 19 51, U .S. Geological Survey Circular 91,_ p. 1 5 -16, and table 4. ,__ _ _191>7, Geological Society of America Bulletin v. 68, p. 1486- 1 489. / 172 GEORGIA GEOLOGICAL SURVEY BULLETIN 74 , Lithologic and paleontologic descriptions of cuttings- and cores. Samples are cuttings unless otherwise stated. Depth (feet) 0-2700 Description Samples not studied. 2700-2705 2705-2710 2710-2740 2745-2790 2790-2795 2795-2810 Tertiary In Paleocene Series Beds. containing Tamest fauna Marl, light-gray, chalky, highly silty, glauconitic, about 50 percent of sample. Fragments o{ grayish-green shale. Mainly silty marl, like sample at 2700-2705 ft., and. fragments of hard gray limestone that is probably lenticular in the silty marl. The fauna includes specimens of ostracodes and specimens of the small foraminifer Globigerina triloculinoid.es; also specimens of Cibicides sp., Globorotilia velascoensis, and a small Robulus sp. Like the sample at 2705-2710 ft., but showing an increase of limestone fragments. No marked change in fauna.. No change in material. Shale, gray, soft, silty, glauconitic, is probably drilled at this level. The microfauna in the .samples at 2745-2790 ft. and 2790-2795 ft. includes specimens of Spiroplectammina mexiaensis, Mars- sonella oxycona, Robulus midwayensis, No.dooaria affinis, Cibi- cides alleni, Ancrmalina acuta, and .Globigerina pseudobulloides. No change. ' . <, ) x"~" Cretaceotis Gulf Series 'r ; .:U ~ t- . Beds of Taylor age .. . , ~ ~ . 1 28i0-2815 v .;Lfmestone, white, hard, chalky, glauconitic, somewhat sandy (very !r . $-' fine-grained sand); sample contains 'fragm~nts of lnocll'Yamus, and cavings from higher levels. The fauna contains specimens ... I! . . ( of Globt>truncana ma'rginata; Marssonella .oxycona, Planulina dumblei, Stensiaina ame.r.ic.a.n.. a,,, .and-,.o. thers. ,. . ' . . . ~ 2815-2820''1~ . Chalk, white, hard, somewhat glauconitic; many fragments of Inoceramus, other fossil bivalves, and echinoids. Microfauna as 1 ' ' i n sample at 2810-2815 ft:; many specimens of Planulina dumb lei. 2820-2825 2820-2825 Chalk, white, moderately soft; many Int>ceramus fragments; and microfauna as in the samples beginning at 2810 f.t. Chalk, white, moderately .soft; many Inoc~Wamus fragments,. and microfauna as in the samples beginning at 2810 'ft. 2825-2855 No change. LOGS OF SELECTED WELLS IN-THE' COASTAL PLAIN OF GEORGIA 173 Depth (feet) . Description 2855-2860 ... J, : . ' "' , 2860c2865 Washed residue, smaU, probablY. from a soft white chalk, contain- ing fragments of green shale (caving?), abundant Inoceramus fragments and ,prisms. Microfauna shrtilar to preceding : Cre- taceous samples: Pla.nulincidumb lei (common), and many~ speci- mens of Litiwla ti:iylorensis (highest occurrence). Material and fauna is similar to the s~mple at 2855-2860 ft., but sample contains few fragments of Lituola sp. ' ' . 2865-2900 . No change. 2900-2905 .. '; :.h ~ ,::. .- -~ Chalk, white, also fragments of hard gniy limestone and soft gray marl that are probably caving. The fauna contains fragments of Inoceramus, specimens of Lituola taylorensis and other species as in the preceding cretaceous samples; and specimens of several species of ost~acodes. . 2905-3910 Material and fauna like sample at 2900-2905 ft.; libout 25 percent .. of the washed sample. is composed of fine to coar'se~grained quartz sand (from drilling mud?). 2910-2915 - ; 2915-2920 . .1':" 'i' , 1' .,. ,,J11 2920~2925 Like sample at 2905-2910 ft., but with about 50 percenLsand.. . Marl, gray, soft, cavings from higher levels, abundant fragril~nts of Inoceramus, and speciinehs oi Foraminifera that are mainly, ' Planulina d~l:inbl~i, Gl~botruncanii' ~etacea, and a few fragments of Lituola tiiywrensis. ; ..,... : . Like sample ai 2915-2920 ft. and a few fragments of Kyphopyxa christneri. 2925-2945 2945-2950 Material and fauna like samples at 2920-2925 ft. Washed residue, s~all . P~obably from a soft gray marl, containing Inoceramus fragments, speciine~s of Foraminifera (Globotruncana sp. fairly common), and many small nodules of pyrite. 2950-2955 Like sample at 2945-2950 ft. Specimens of Robulus sp. and Globotruncana sp: a:re dominant in the fauna, . which contains, . also, specimens of Marginulina austiniana: . 2955-:!"9'65 No change. 2965-2970 'Material and fauna as in immediately preceding samples; also a few specimens of Pseudogaudryinella capitosa. 2970-2975 . 2975-2980' Like sample at 2965-2970 ft. Marl, gray, containin.g small nodules of pyrite, abundant Inoceramus f~agments, and specimens of Foraminifera, among which Globotruncana sp. and Robulus sp. are common. 2~80-2990 No change. .. 2990-2995 - Material and fauna like sample at 2975-2980 ft., with the addition s: of specimens of Citharina wadei. 29_..9,.,5.. ~~3000 ' 3 3000-3050 Like sanipie at' 2990-2995 ft. but specimens of Citharina wadei ~,., absent. :spe'cimens of Marginulina .il.ustiniana and Globigerina sp; fairiy common. Like ~ample at 2995-.3000 ft. and abu1_1dant cavings. ,.. ~ . .. t ~~ . ....... . ;.~ _174 GEORGIA GEOLOGICAL SURVEY BULLETIN 74 Depth (feet) Description Beds of Austin age 3050-3060 Chalk, white, moderately hard; many fragments contain much very fine calcitic material, and abundant specimens of Oligostegina, characteristic. of the beds'of Austin age. Nodules of pyrite and fragments of Inoceramus are common. 3060-3070 No change. 3070-3075 Marl, brownish-gray, soft, is probably drilled at this level. Sample contains many Inoceramus fragments, nodules of crystalline pyrite, and cavings. Among the indigenous specimens of Fora- minifera, GlobotTuncana marginata and Globigerina sp. -are dominant; Planulina austiniana and Gumbelina reussi are fairly c'ommoit; specim~ns of Valvulineria infrequens (Austin var.) are present. 3075-3080 Like the sample at 3070-3075 ft., also fragmen~s of Citkwrina texana. 3080-3085 Not described. 3085-3090 Clay, gray, marly; contains many Inoceramus fragments . and prisms, nodules of crystalline pyrite, and specimens of species of Foraminifera characteristic of .the beds of Austin age. 3090-3100 Clay, gray, marly; contains a few Inoceramus fragments, nodules of' pyrite, specimens of Foraminifera, and many _ostracodes. , 3100-3125 No change. 3125-3130 Clay, gray, marly; contains Ini>ceramus fragments and nodules of pyrite. Specimens of Gumbe'lina sp. and Globige1-ina sp. are dominant' in the microfauna, which also contains many specimens of. Globotruncana sp.. and a small A nmnalina sp. 3130-3230 No change. 3230-3235 3235-3240 .Washed I'esidue, small. Contains fragments of gray marly clay, Inoceramus fragments, nbdules of pyrite, and a few small frag- ments of dark brownish-gray slightly speckled, marly shale. The, microfauna is like . that in the sample ' "' at 3125-3i30 . ft. . Two separate .samples at this depth. a. Like sample at 3230-3235 ft. -r . -t b. Like sample at 3230-3235 ft., with the addition of many frag- ments of gray,. hard, sandy (fine-grained sand) limestone, and fragments of Ostr~a-Iike bivalves. :!. ' 3240-3250 Materials and fauna like sample at 3230-3235 ft; 3250-3255 3255-3265 Core 4. Recovery 4 ft. Top. Clay, light-gray, marly slightly micaceous. Washed residue is small and consists of specimens of Gumbelina sp. and Globi- gerina sp.,_many specimens of Globotruncana marginata, Planu- lina austiniana (sinal!), and Virgulina tegulata; a few speci- mens of ostracodes, including Cythereis dallasensis. Core 5. Re~'~very 3 ft. . Clay, brownish-gray, marly, light~speckled. '.l,'he fauna consists LOGS OF SELECTED WELLS IN THE COASTAL PLAIN OF GEORGIA 175 Depth (feet) De8cription of a few fish scales, and specimens of Foraminifera and Ostracoda like sampie at 3250-3255 ft. 3265-32'(0 Core 6. Recovery 4 ft. . Top. Chalk, light-gray, moderately hard. The fauna consists of specimens of Foraminifera and Ostracoda like sample at 32503255 ft., with the addition of specimens of Oitharina texana.' Bottom.- Like top part of core, but no C. texana. 3270-3280 Core 7. Recovery 5 ft. Top. Marl, gray (darker gray than preceding cores), light speckled. No change_.in fauna. ' ~ :r 3280-3285 Bottom No change. Core 8. Recovery 5 ft. Top. Marl, gray arid brownish-gray, light speckled. No change in fauna. Bottom. Marl, gray, soft. No change .in. fauna. 3285-3295 Core 9. Recovery 4 ft. . > Top. Chalk, white, moderately h;1rd; few specimens of Fora- minifera wash free. 1~ _ -,. - . t Bottom. Mar:!, dark-gray, highly light-speckled. . Microfauna like the preceding core samples. 3295-3300 Core 10. Recovery 9 ft. Top. Chalk, white, moderately hard. No change in fauna. Middle. Like top of core. Bottom. Marl, gray and brownish-gray, speckled; contains thin hard lenses composed of masses of calcitized microfossils and microfossil fragments; no change in fauna. 3300-3310 Core 11. Recovery 10 ft. Top 3ft. Marl, dark brownish-gray, speckled, highly pyritic. No change in fauna. 2nd 3 ft. Chalk, light-gray, moderately hard; contains much calcitized microfossiliferous material (Inoceramus prisms and . specimens of Foraminifera). Globigerina sp. and Gumbelina sp. very abundant; also many speCimens of Globotruncana sp. typical of the lower part of the Austin chalk. 3d 3 ft:Chalk, white, moderately hard, similar in general character and fauna to the 2nd 3 ft. Bottom 1 ft. No change. , (jlay, gray; calcareous, and speckled marl. Sample contains many . . ' t -: , Inoceramus fragments, nodules of pyrite, and specimens of Foraminifera like the preceding cores; also a few specimens caving from higher levels. 3320-332!) Material and fauna like sample at 3310-3320 ft.; also a few frag. ments of very fine grained, somewhat glauconitic, calcareous sandstone that contains specimens of many small foraminiferal species like those mentioned in preceding cores. 176 GEORGIA GEOLOGICAL SURVEY BULLETIN 74 . Depth (feet) Description 3320-333().! . , Cor~-:13. Recovery 10 ft. , .~ Top 1 ft. Clay, shaly-, gray, soft, silty. Sample contains small nodules of glauconite, a few nodules of pyrite, and many speci-'. . mens of Foraminifera. Specimen's of . a s~all Globigerina sp. . and a small Planulina sp. are common; specimens of Gumbelina .,., . sp. are in th_e fauna, though not abunda~t: ,. 2nd 2 ft. l)iarl, gray, containing a .very large amount of Inoceramus prisms and calcitized molds of specimens of Foramini-. fera. Common forms are: Globigerina sp., Globotruncana sp. (lower Austin form); G~mb.eliM sp.; a)ld a few Planulina sp., like the top part of the core. 3d 4 ft. Marl, light-gray, chalky, like the preceding part of the core in character a~d fau,na. . 1 "' \ , _ \ ) - Bottom 3 ft. M~rl,' g;~y, highly microfossliiferous, somewhat ~~..._ white speckled. N'o .change in faun,a. 3330-3340 Core 14. Recovery 10 ft. ;.: - . Top 5 ft. . Marl, gray. , soft. Fauna ';: c~' mp~sed. of Inoceramus prisms and specimens of G?obigerina sp. and Gumbelina sp. . 2nd 4 ft. Marl, gray, sandy (medium~grained to moderately .,... coarse-grained' sand)'. Phosphatized fragments of fish bon~s of common. Washed residue large; composed 50 percent sand and 50 percent Inoceramus prisms and speCimens of Foramini- fera. Fauna like core 13- at 3320-3330. ft., and a 'few: specimens , of Planulina eaglefordensis and.Cythere.is eaglefO'i-denBis. Atkinson F'Ormation. Up~r Menibe;. 3340-3345 i- - . . ' 3345-3350 Bottom 1 ft. Marl, gray, .soft, sandy, like top part of core, and gray, hard, sparsely sandy'limestone containing fragments of fos- sil .bivalves. The limestone marks the top of the upper member of the Atkinson Formation. L -. Core 15. Recovery 4 ft. Top 2 ft. Sandstone, white, hard, fine to medium-grained, calcareous, highly pyritic; contains phosphatic fragments and fragments of fossil bivalves. 2nd 1 ft. Sandstone; white, hard, medium to coarse-grained, calcareous, pyritic;- contains fragments of phosphatized fish bones, and fragments of fossil bivalves.. Bottom 1 ft. Sandstone, light-gt~y:, hard, . calcareous, very fine . grained, and sandy limestone, containing many shell fragw.ents, . a little pho-sphatic material, a trace of fine-grained, bright- green glauconite, a trace of mica, and a few specimens of ostra- codes, Core 16. Recovery. 3 ft. Top 1,2 ft. Siltstone, light-gray; moderately soft, micaceous, slightly glauconitic; contains fragments of Ostrea. sp. (common), and fragments of phosphatized fish bones. Washed resi- due contains much fine to medium-grained qtil:irtz sand. ~ r LoGs OF SELECTED WELLS IN THE COASTAL PLAIN OF GEORGIA 177 Depth (feet) Description . 2nd 1h ft. Sandstone, light-gray, hard, calcareous, and sandy ' limestone; contains abundant shell frai;ments, and. is irregularly micaceous and somewhat phosphatic. Bottom 2 ft. Sandstone, light-gray, fine-grained; calcareous, micaceous; contains many shell. fragments and phosphatized fragments of fish bones. 3350-3355 Core 17. Recovery 2 ft. Top .! ft. Shale, gray-green, flaky, slightly si-lty; contains phosphat~c fragments, shell fragments, and a few specimens of ostracodes. Bottom 1.! ft. Siltstone, light-gray, soft, micaceous, calcareous; contains fairly common specimens of several species of ostracodes, and specimens of Valvulineria infrequens (Eagle Ford variety) , and of a very small Gumbelina sp. . 3358-3362 Core 19. Recovery? Washed sample is .very fine grained sandstone and a few shell fragments. . 3362-3367 Core 20. Recovery 5.! ft. . Top. Sand, fine to medium-grained quartz; containing many worn and broken shell fragments, a few phosphatic nodules, and a few specimens of ostracodes. Bottom. Sandstone, fine to medium-grained, soft, quartz, con~aining many worn and broken shell fragments (Ostrea? sp.), pyrite, a trace of glauconit~, mica and phosphatic material. 3367-3372 Core 21. Recovery 5 ft. Top. Clay, light greenish-gray, soft, sandy, micaceous; contains a few shell fragments and phosphatic nodules. Bottom. Shale, greenish-gray, soft,. sandy (fine-grained sand), .slightly glauconitic. ' '3372-3377 . Core 22. Recovery 5 ft. Top. Like bottom part of Core _21 at 3367-3372 ft. Bottom, Clay, light greenish-gray, sandy (fine to medium;k grained sand), micaceous, slightly glauconitic, somewhat phos~ phatic. 3375-3380 ,. Sand, light-gray, fine-grained, and shale; contains many shell fragments, many bryozoan fragments, specimens of Foraminif~ra from younger beds, a few fragments of light-green shale, and a little glauconite. 3380-3390 No change. 3390-3395 _, Like sample at 3375-3380 ft. The microfauna contains specimens of F~raminifera that have caved from various levels, but also contains specimens of species that are typical of the upper mem- ber of the Atkinson Formation. Common species are: Giimbelina sp. (small), Valv11lineria infrequens (Eagle Ford variety), and small specimens of Planulina: eaglefordensis. 3395-3400 Like sample at 3390-3395 ft. Sample composed, mainly, of frag- ..~.. 178 Depth (feet) - 3400-3420 3420-3425 3425-3430 3430-3435 3435-3475 3475-3480 3480-3500 3500-3505 3505-3555 GEORGIA GEOLOGICAL SURVEY BULLETIN 74 Description ments of O!ftrea sp., bryozoan fragments, a few fragments of fine-grained, micaceous sandstone, and a few specimens of Foraminifera caving from the beds of Austin age. No change. Sample composed of shell fragm ents, bryozoan fragments, loose sand, and micaceous sandstone; also many fragments of white, sandy limestone, containing many embedded shell fragments. - Like the sample at 3420-3425 ft. - Dominant materials in the sample are about 50 percent fine to moderately coarse grained sand, and fragments of white, irregularly sandy, macrofossiliferous limestone reported in the sample at 3420-3425 ft. Sample also contains bryozoan fragments, shell fragments, phosphatic nodules, and a -few fragments of sandstone. No change. Like sample at 3430-3435 ft., but fragments of white, fine to medium-grained, glauconitic, micaceous sandstone are slightly more common. Sample also contains a few fragments of flaky green shale. No change. Sandstone, white, medium-grained, calcareous, somewhat glauconitic and - phosphatic; contains many fragments .of Ostrea sp. a,nd a small Gryphea. Loose sand and shell fragments compose about 75 percent of the sample. No change. 3555-3560 3560-3570 3570-3575 3575-3580 3580-3585 Atkinson Formation. Lower Member. The top of the lower member .of the Atkinson Formation is pl~ced at 3550 ft. on the basis of electric log correlation supported by -the samples. Sample is composed mainly of loose sand and abundant shell fragments, but also contains many fragments of light-tan, hard, sandy limestone in which shell fragments are embedded. No change. Washed sample, composed m~inly of sand and -shell fragments. Washed sample, small; composed of fragments of gray, micaceous siltstone ; fragments of the sandy; fossiliferous limestone reported in sample at 3555-3560 ft.; -a little loose sand; and .phos- phatic nodules. The material drilled at this level is probably siltstone and soft, greenish-gray shale, a few fragments of which are in the sample. The sample contains specimens of arenaceous species of Foraminifera, among which are specimens of Ammobac!tfites stephen8oni. No change. LOGS OF SELECTED WELLS IN THE COASTAL PLAIN OF GEORGIA 179 Depth (feet) 3585-3590 3590-3595 3595-3605 3605-3610 3610-3620 3620-3625 3625-3630 3630-3660 3660-3665 3665-3670 3670-3680 Description No change in material, but no specimens of arenaceous Foramini- fera observed. No change in material but contains specimens of Ammobaculites stephensoni; specimens of Planulina eaglefordensis, and some other species that are probably caving from higher levels. No change. Washed sample, small; comp~sed (,If fragments of grayish-green shale, a little loose sand, and a few shell fragments. The microfauna contains specimens of Ammobaculoides plummerae and Ammobaculites advuntts. No change. Washed sample, small; composed of greenish-gray and light-brown, somewhat micaceous shale. Shell fragments and sparse specimens of Foraminifera are probably caving. Material like sample at 3620-3625 ft.; specimens of Foraminifera like sample at 3605-3610 ft. No change. Core 23. Recovery 1 ft. Shale, olive-gray, flaky, slightly micaceous; contains a few small reddish-brown, irregular-shaped nodules of siderite, and a few specimens of Ostracodes. Core 24. Recovery 5 ft. Top 1 ft. Shale, gray, flaky, containing irregular streaks of light-gray, micaceous silt. 2nd 1 ft. Material like top 1 ft. Washed residue, small; composed of fragments of shale and siltstone, and abundant small, irregular-shaped nodules of siderite. The microfauna contains specimens of Ammobaoulites comprimatus, Trochwmmina rainwateri, specimens of small Globigerina sp., small Planulina sp. (related to P. eaglefordensis), and small Gu1nb elina sp. 3d 1 ft. Shale, olive-gray, micaceous, and a little siltstone, containing a few small irregular-shaped nodules of siderite, a few comatulid fragments, and specimens of Foraminifera like preceding part of core. 4th i ft. Shale, gray, slightly micaceous, containing a few silty areas. No change in microfauna. Bottom 1 ft. No change. . \ . Core 25. Recovery 10 ft. . Top 3 .! ft. Shale, gray, micaceous; almost no washed residue. Middle 3.! ft. Shale, like top part of core, and a little siltstone. Fauna like core 24 at 3665-3670., and in addition, many speci- mens of Ammobacltloidcs plumme1ae. Bottom 3 ft. Unaccounted for. -~ :.;.... 180 Depth (feet) 3680-3690 3690-3700 3700-3710 GEORGIA GEOLOGICAL." SURVEY BULLETIN 74 Description Core 26. Recovery 10 ft. Top 1ft. Shale, gray, flaky. 2nd 1 ft. Shale, gray, micaceous, somewhat carbonaceous, containing lenses of siltstone and very fine grained micaceous sandstone. 3d 2 ft( ?) No sample? 4th 4 ft. Shale, gray. Bottom 2 ft. Shale, gray, flaky, containing. lenses of light-gray, micaceous siltstone. The shale contains scattered specimens of very minute dwarf speci,es of Foraminifera. Core 27. Recovery 10 ft. Top 1ft. Shale, gray, and gray, hard, silty clay. Washed sample.. -, Sand, fine to coarse-grained, quartz, worn and broken shell frag2. .'- ments, and phosphatized bone fragments. '""';., 2nd 2 ft: Sandstone, gray, very fine grained, calcareous, mica. ,. caceous, slightly glauconitic, containing abundant specimens of small Gumbelina sp. and small Planulind sp., a few specimens of ostracodes, and small fragments of shells. Thin. lenses of gray shale contain specimens of A1nmobaculites agrestis, and two species of Gii1nbelina. 3d 2 ft. Sandstone, very fine-grained, calcareous, micaceous, slightly glauconitic, containing shell fragments , and phosphatic material. 4th 3ft. Clay, gray, sandy (fine-grained sand). Washed sample. Sand, fine-grained, containing many shell fragments, echinoid spines, nodules of pyrite, and many specimens of species of Foraminifera characteristic of the so-called "Barlow" faunal. Common species are: Ammobacul:ites agrestis, A. advenus. Haplaphragmoides langsdalensis,; Trochammina rainwateri, Citharina kochi, Placopsilina langsdalerz,sis, Quinqueloculina lirelldngula, Marsonella cf. M. ellisorae, Ammobaculites junceus, Globigerina sp., Nodosaria sp., Discorbis cf. D. minima; several species of ostracodes also common Bottom 2 ft. Siltstone, gray, micaceous; .gray; micaceous shale; soft, argillaceous, medium t;; ~oarse-grained sandstone; a-little glauconite; a few fragments of worn shells; .a few phosphatic nodules. The lenses of shale contain many small, irregularshaped nodules of ~iderite and of..glauconite, fine-grained sand, and a few small specimens of Awmobaculites. Core 28. Recovery 10 ft. Top 3 ft. Shale, gray, slightly micaceous, containing lenses. of gr!J.y, very fine grained, calcareous sandstone. The sandy leri'ses contain the "Bai'low" fauna described in the 4th 3 ft. of Core 27 at 3690-3700 ft., with slight difference in. the species; Globi- 'Applin, E . R., 1956, U.S. Geological Survey, Prot. Paper 264-I, p. 187-197, pis. 48 and 49. LOGS OF SELECTED WELLS IN THE COASTAL PLAIN OF GEORGIA 181 r1~~~ Description ' ' ' '. gerina sp. is common in this.sample, and AntmobaculO sorted, fine to coarse-grained, roughly angular, slightly etched; contains a few pink-tinted grains. 3750-3755 Core 33. Recovery 1 ft. i ' Top 10 in. Sandstone, light-gray, highly argillaceous, micaceous, glauconitic, like core 32 at 3740-3750 ft.; contains a few shell fragments. Bottom 2 ft. Clay, gray, soft, silty, micaceous. 3755-3765 Core 34. Recovery 11 ft. Top 2 ft. Clay, greenish-gray, irregularly red-streaked, micaceous, sandy (fine to medium-grained sand), and a few fragments of brownish-red waxy shale. 3765-3775 3775-3780 3780-3880 3880-3890 3890-3900 3900-3930 3930-3940 3940-3990 3990-4000 Comanche Series undifferentiated The top of the Comanche is placed at 3760 ft. on the basis of samples and electric log correlation. 2nd 5~ ft. Clay, dull-red and greenish-gray mottled, waxy, micaceous, highly sandy. Washed sample contains fragments of gray and dull purplishred sandy clay, and fine to coarse grains of sand washed from the clay; 'also flakes of biotite and muscovite. Bottom 3.3 ft. Clay, light greenish-gray, waxy, _irregularly ,sandy, micaceous. The clay shows irregularly stained red and mustard-yellow areas probably caused by oxidation of iron minerals. Core 35. Recovery 8 ft. Top 4 ft. Sandstone, dull-red, argillaceous, micaceous, moderately coarse grained. The sand grains are roughly angular, etched quartz and a little feldspar; the mica is biotite and muscovite. Bottom 4 ft. Clay, dull-r~d and greenish-yellow mottled, silty to sandy (fine-grained sand), micaceous. Sand, coarse to very coarse grained, quartz, and a little feldspar; many grains red-tinted. No change. Sand, like sample at 3775-3780 ft., and a few fragments of dark- red clay shale. ' Sand, very coarse grained, quartz, (many amber-tinted grains), and a little feldspar; a few fragments of red shale. No change. Sand, very coarse grained, quartz, and feldspar; many 'of the grains are amber-tinted and pink-tinted; a little mica. No change. Sand, fine to very coarse grained, and a little feldspar; many grains are amber-tinted. LOGS OF SELECTED WELLS IN THE COASTAL PLAIN OF GEORGIA 183 Depth (feet) 4000-4010 4010-4020 4020-4120 Description No change. Sand, coarse to very coarse grained quartz, and a little feldspar; many grains are amber-tinted and pink-tinted; also a few frag- ments of "basement" rocks. . Like sample at 4010-4020 ft., and a few fragments of weathered Paleozoic shale. Silurian Upper Silurian Series 4120-4127 4130-4135 4135-4140 4140-4145 Sand, like sample at 4020-4120 ft., and fragments of red and gray mottled, thinly laminated shale . that are probably from the weathered surface of the Paleozoic sedimentary rocks. Cuttings of diabase, and' cavings from higher levels. Diabase fragments, mainly, and a few fragments of the weathered (?) Palezoic rocks. Like sample at 4135-4140 ft., 'With the addition of fragments of dark brownish-gray, hard, material (resembles dolomitic limestone) attached to fragments of diabase ; a few fra gments of dark-gray shale (Palezoic). 4145-4150 4150-4155 4155-4160 . 4160-4165 416~-4170 Not described or no sample. Diabase; like preceding samples, many fragments of reddish (weathered(?) Paleozoic) shale, and a few fragments of black shale (Paleozic). Sandstone, gray, quartzitic, extremely fine-grained, a little black shale, and cavings. Diabase, quartzitic sandstone, and a little black shale. Core 36. Recovery 1 ft. Bottom Ih ft. Quartzite, gray, and thin lenses of black shale. 4170-4185 T.D. Paleozoic sedimentary rocks. LOWNDES COUNTY* Owner: U.S. Government . (War Department) well 3 Location: 3 mi. southeast of Base (Moody Field) at Ordnance Site , GGS. No. 182 Elevation: 202 ft. Total Depth : 248 ft. Completed: I k. Publication of this data is authorized by the Sun Oil Company, for whom the report was prepared on a commercial basis.. ... t l84 GEORGIA GEOLOGICAL SURVEY BULLETIN 74 Summary of Stratigrap.hy Tertiary Depth (feet) .. Th iokness ' ' (feetH Miocene undifferentiated 5 160 lower, Tampa Limestone_____.:________________._~-----. 165 25 Oligocene upper, Suwannee Limestone _________________:_______ ___ . ' ; '. 190 to 15 205 ft. (last sample) Lithologic and paleontologic description ' of cut- tings and cores: Samples are cuttings unless otherwise stated. D ep t h ( f ee t ) Description Tertiary f' . -~ ... 5 10 .. 15 20 25 30 34 37 45 50 55 60 65 70 75 80 85 90 95 100 105 Miocene Series undifferentiated . ~ ,'(. Clay; red, highly sandy: Like sample at 5 ft. Clay, purplish-red, sandy. ~ ;- . " Clay, pinkish-tan sandy. Clay, yellowish-brown, soft, highly sandy. Sand, clear quartz, iron-stained, coarse; rounded grains. Sample contains. nodules of limonite that were probably embedded in red clay. Clay, yellowish-tan, highly .sandy (coarse-grained sand). : ' Like ,~ample at 34 ft. , Clay, light, yellowish-brown, highly sandy. Like sample at 45 ft., and many white, moderately soft, polished nodules. Like sample at 50 ft. Like sample at 55 f~;, _but much les~. sandy. Clay, yellowi:;;,h-tan, sandy, sticky. Clay, light-gray, .sandy (fine-grained.sand). !...:* J ..,_. ~., ~ ' Clay,.cream, highly sandy (very fine-grained sand); ,contaitj.s ~ ~ trace of..carbonaceous material. " . H~ . Clay, light-tan, highly sandy, sticky. : l ,. ' - - 1:,: . jJi :'\. . ., '} Clay, white, highly sandy, sticky. Sand, white, moderately fine-grained, ,argillaceous. Like sample at 90 ft: Clay, white, highly sandy; some fragments show dendritic mark- ings. Like sample at 100 ft. "J: . .... . -- .~ LOGS OF SELECTED WELLS IN THE .COASTAL PLAIN OF GEORGIA 185 Depth (feet) 110 115 120 125 130 135 140 145 150 155 160 Description Like sample at 100 ft. Clay, white, highly sandy, .sticky. Clay, white, sandy, containing nodules of light-green, unctuous . clay, Sand, clear quartz, containing nodules of white sandy clay. Clay, greenish-white, highly sandy. Clay, white and light-brown, sticky, somewhat sandy. Sand, clear quartz, uneven-grained. The sample contains many nodules of white clay, and a few worn fragments of shells of fossil bivalves. Sand, clear quartz, uneven-grained, and a few nodules of white sandy clay. Like sample at 145 ft. Like sample at 145 ft., and a f ew cream, sandy, calcareous nodules. Like sample at 155 ft. 165 170 175 180 185 i,) ., 190 195 200 . 205 , (last sample) Lower Miocene. Tampa Limestone.. Limestone, white, moderately hard, chalky, slightly sandy, containing echinoid fragments, fragments of fossil bivalves and crab claws, and fragmentary sections of Sorites? sp. Like sample at 165 ft. Sand, chalky; a small sample. Limestone, tan, hard,. somewhat sandy. .. Limestone, reddish-tan, hard, somewhat sandy. Oligifcene Series Upper Oligocene. Suwannee Limestone . ,;1 } : ,. ~ ~ Limestone, white, moderately hard, chalky; also fragments of tan, slightly sandy limestone, and a little unconsolidated clear quartz sand. Like sample at 190ft~ Limestone, light-cream. The cuttings are nodular, seem to be some. what water-worn, and contain vague traces of impressions of fossil fragments. The sample also contains a few fragments of partially dolomitized limestOne, and cavings from higher levels. Limestone, white, hard, containing traces of fossils. The sample also contains fragments of brown dolomitic limestone, cavings .,. ~ ' .:from higher levels, and a few calcitized specimens of Rotalia Cf. R. byratnensis. 186 GEORGIA GEOLOGICAL SURVEY BULLETIN 74 MITCHELL COUNTY 'I Operator: Stanolind Oil '& Gas Co. GGS. No. 109 I' Landowner: J. H. Pullen, Well 1 Elevation: 338 ft. Location: Land District 10, Land Lot Total Depth: 7490 ft. I. :: _ 133, 700 ft. south of north line, and Completed: Aug. 14, 1944 700 ft. west of east line of Land Lot 133 Summary of Stratigraphy Tertiary Depth Thickneae (feet) (feet) In Eocene lower Beds of Wilcox age ; 1st sample 1335 ft. Paleocene i. Clayton Limestone ------------------------------------------------- . 1560 130 Cretaceous Gulf Beds of Navarro age ----~------------------ 1690 220 Beds of Taylor age -- - --------- - - ---------- 1910 440 Beds of Austin age -------- - -- ------- - ------- - 2350 480 .' - Atkinson Formation, upper member___________________ 2830 530 lower member__________________________ 3360 280 Comanche undifferentiated ------------ ------------------- 3640 2580 Triassic(?) to Upper Triassic(?) . Newark ( ?) Group -------"------:___~:..:.:.__________6220 ( ?) total1270 ~,I ... depth I -: ' ' Lithologic and paleontologic description of cores and cuttings. .Samples are cuttings unless other- - > ::otherwise stated. \.. Depth (feet) Description 0-1335 Samples not. studied. ., .I : Tertiary . --r:l.r ~: In Eocene Lower Eocene. Beds of Wilcox age. 1335-1350 Limestone, white, chalky, underlies a sequence of glauconitic 'sand and gray glauconitic cl~y. The sample is probably in the Salt Mountain Limestone, the top of which is at about 1320 ft. as suggested by the electric ' lbg of the Pullen well. Specim~ns of LOGS OF SELECTED WELLS IN THE COASTAL PLAIN OF GEORGIA 1St D epth (feet) 1350-1560 Description DU3cocyclina weaveri occur in the other samples of the limestone, although none were observed in this sample. Samples not described. 1560-1575 1575-1590 1590-1605 1605-1620 1680-1695 Paleocene Clayton Limestone The top of the Clayton Limestone is at about 1560 ft. on the basis of the electric log of the Pullen well. This sample contains the highest occurrence of white, hard, rough-textured limestone. No samples. Limestone, white, hard, chalky, and abundant fragments of gray: ish-brown chert. The sample contains a few specimens of Anoma.- lina alleni . Limestone, white, hard, chalky (composed of very small chalky fragments), and abundant fragments of chert. The sample contains some specimens of Foraminifera indicative of the Clayton Limestone. Same to: Limestone, somewhat sandy (fine-grained sand) and slightly glau~ conitic; chert is abundant. and seems to occur in streaks in the limestone. Specimens of Anomalina vulgaris var., A. a1leni, and other forms typical of the Clayton Limestone are common in the sample. Beds of Midway age seem to overlie the Clayton Limestone, inasmuch as specimens of Vaginulina robusta occur in cavings in this sample. 1695-1710. 1710-1725 1725-1845 1845-1860 1860-1870 Cretaceous Gulf S~ries Beds of Navarro age / The top of the beds of Navarro .age is placed at 1690 ft. on the basis of lithologic data and electric log characteristics. The high- . est occurrence of spec1mens of Fo~aminifera that definitely indicate the Cretaceous age of the beds is at 1800 ft. The highest oc_currence of Globotrunc_ana area is in the sample at 1815-1830 ft. Samples not described. Clay, dark brownish-gray, marly, occurs in this sample and inc~eases in ab~ndance in the samples just below this depth. Samples not described. The microfauna in this sample contains specimens of species characteristic of the beds of N avarro age ; Pseudogumb elina costulata, A nomalina pseudopapillosa, Globotruncana cretacea, Pseudoclavulina clavata. Limestone, light-gray, hard, very finely_glauconitic, sandy (finegrained sand), occurs in this sample and in the sample at 18451860. f t. The microfauna is sparse and Navarro in character. 188 Depth (feet) ~870-1905 GEORGIA GEOLOGICAL SURVEY BULLETiN 74 , No change. Description Beds of Taylor age The top of the beds of Taylor age is placed at 1910 ft. on the basis of electric log characteristics. 1905-1920 192.0-1935 1935-1950 1950-1965 ' 1965-1980 1980-1995 1995~2010~, .t 2010-2025 Materials like the sample at ' 1860-1870 ft. The sample contains ,. f one speci~ens of Planutina ~u7r!-bl~ i, many specimens of AnO?n!l_li- . . . ' ~ _no ,.. i d. es pin.gttis. , .and a few .f.ragme...n. .ts Bolivinoides decorata. Like sample at 1905-1920 ft., .with the addition of specimens of . Litu~la taylorensis (co~mon). . . ... l.i. . :1 , ,Like sample at .1920'-1935 ,ft., . and . some fragme~ts of ligJ:lt-green .bentonite. . : '' ,, Sandstone, g~ay, 'hard; fine-gr~ined, calcareou~; specimens of Li- . tuola taylorensis ar-e common. 'sh~le, gray, composes ~~st ; of a very small sample. The ~ample ... contains some.Inoceramus prisms and a few specimens of Hetero- . stomella americana. ,. Likesample at 1965-1980 ft. Fragments 9f In_oc!lra.mus , are com~ mon. The microfauna in.. this:sample contajns specimens o:f spe~ies char- acteristic of the beds of Taylor age; Planulina te:cana, Gyroidina . .umbilicata,, Globorotdlites conicus, Bolivina incrassqta; Bullimi- . 'nella carseyae. , . . ... No sample. ~t{ ~ . i :. . ~- 2025-2040 :2040-2295 :2295-2.~.,10 \ ; I' Sample is mainly cavings from higher levels. Some specimens of StensiOina ameridana.: are . in the sample but these may have caved, as the specie-s . usually occurs at or near the. top of the beds of Taylor age. . , . Samples not de~crfb~d. J ' sandston'e, e~tremely fin~-giained, calcareous; micaceous, contain- ing abundant fragments of Inoceramits, many nodules of pyrite, and some fragments of gray, micaceous marl. The microfauna is a mixture of.. specimens from several stratigrap~ic units but i~cludes sp~cim~ns pf Planulina taylor 1, 25 LOGS OF SELECTED WELLS IN THE COASTAL PLAIN OF GEORGIA, 189 ,.._. Depth (feet) Description . ... 2370-2385 at. Similar to sample 2310-2325 ft:, but the material is somewhat harder, more . cl).lca;reou~, and leaves a larger ,,~vashed residue. is The fau~a also similar to that in the samp~es below 2310 ft., but co~tains a f ew. sp~cimens _of Pseudoclav:~lina czavtita and H eterostomellq. austiniana. 2385-2400 . Like samples at 2370-2385 .ft.; . and containing. Globorotalites um-- ' I ...-'f "J bilicatus and Gaudryirni austiniana. 2400-2460 Samples not described. , 2460-2475 Clay, dark-gray, soft, marly,- containing specimens of Pileudogaudrflinella capitosa, Planulina dumblei, Globotruncana area, and Globorotalites conicus. 2475-2505 Samples not described.. ., :, .' " d :.:; .. _ _: 2505-2520' Ciay, dark-gra'y, soft, ma.rly, containing il?ec1meJ1s of Globoro- talites umbilicatus. 2520-2580 ~-- Sample~ not' described. .. of' '2580-2595 ~...A S~ndsione, graY, eX:treriieiY fine grairied, glauconitic; calcareous, ~ "' ' micaceous, and som~ fragments gray, flaky, marly, micaceous ,. J ,d l:l~ 1shale. The Sample containS niS:ny fr'agmeftts of Inoceramus and of Ostr:ea sp. The microfauna' is largely; a' mixture of specimens \'~. that caved from higher l~vels, ' but contains some specimens of species that are characteristic of the beds of Austin age: 2595-2610 ' Like. sample at 2580-2595 ft. ;: - ' 2610-2685 No change. 2685-2700 -- Shale, brownish-gray, marly, a few fragments of ~ay, fi~e-g~airied sandstone, and many .fragments of lnocera'Tiius. The foraminifer~} fauna is chiefly a n'lixture of specimens that caved from ' ' higher levels, but contains a f ew .specimens 'of species "tliat are char~cteristic of ,the beds of ~Austin' age. ; ~ 2700:-2730 ~., , No'.change.' ' r . ' . . ' ., 2730-2745 :2745~2~6o" .s ' '' ' ' , _ .. .-: ., l , . Like sample at 2685-2700 ft., with the addition 9f fragme:nts of light-crea~, har d, dense, sandy (fitie~grain~d . ~~nd) liniesu;ne.~ L~ke sa~ple at 273o-274ti ft., bu~ ~bowing an i~crease in the amount . :i . of fragments of sandy. limestone. The fauna is a mixture of speci~ens of . foraminif~r~ f~~m higher lev~l~; including species characteristic of the beds o{ Austin age. ' '.' . . of 2760-2785 The sample is composed; in~i~iy, of gray ~~rl/shale and a small lr amount sandy limestone. rr'h.~ filuna 'is similar to that in the . ' t ... :"Sampie~ at 2745~2760 ft. . ~. ~ ' 2785-2790 f. ' 1 N0 sample. 'o ' - i ). ~ . : ': ' '('~ r' ' ' .,.. I' ' ' 2790-2805 . 1 . . Shale, gray, flaky, , marly shale. The m~rly, 'ari.d. a few fragments of greenish-gray fora~iniferal fauna is ~ mixture of ~pecimens ') . ' from various hi.gher le~eis,' but~ Austin 'forms, esp e ci~iiy' ' Cit/~ . r ina texana are very abundant~ are 2805-2830 '~ ' N? change, eicept that specimens of citharina t exana nitich .., less abundant. r ' ' " ' 190 GEORGIA GEOLOGICAL SURVEY BULLETIN 74 Depth (feet) 2830-2850 .2850-2865 2865-2880 ' 2880-2895 . .. ~ . 2895-2900 . . .~ ~ fl. 2900-2910 2910-2925 2925-2940 c~ 2924-2933 '2933-2943 . .. . ' 2940~2955 ,,_ 2955-29702970-2985 Description Atkinson Formation. - Upper Member. Shale, dominantly greenish-gray,- and some gray shale. The shale contains small, brown, granular, inegular-shaped nodules of -"siderite. Spedmens of Pleurostomella watersi and Valvulineria injrequens (Eagle Ford variety) are present. The samples from 2830 to 2895 ft. are characteristic of the deep-water_ marine facies of the upper member of the Atkinson Formation. Sample not described. Like sample at 2830-2850 ft.; contains specimens of Gaudryina cf. G. bosquensis. Like sample at 2830-2860 ft.; contains in addition, specimens. of Ammobaculites sp., charac;teristic of the Eagle Ford Shale in Texas. Sandf;!tone, quartz, light-gray to white, fine-grained, containing many fragments of Ostrea. sp., and some fish bones, glauconite, and mica. _The samples from 2895 to about 3360 ft. are char- acteristic of the shallow-water marine facies of the upper mem- ber of the Atkinson Formation. The depth of 2895 ft. is prob- ably the . top of t h' e , T u.s c al o os ' a Formation of -some geologists. No sample. :. Like sample at 2895-2900 ft., with the addition of fragments of flaky, smooth, green shale. Shale, gray, flaky, fragments of green ~hale, fragments of Ostrea c sp., and fragments of light-gray, micaceous, glauconitic sand- -. stone which also . contain. s pho. sp. hatic' m' ateri.al' and fish bones. Core. Recovery?_ Sand, clear.quartz, fine-grained, well-sorted, containing a little inica ~nd some tan-gray flaky clay. The clay contains small fragments of carbonaceous material. 'C;re. Recovery? - Top. Shale, bluish-green, thinly flaky, containing a few sandy and pyritic flakes, smail fragments of brown and black carbonaceous material, a little mica, and a trace o-f blue-green glauconite. No specimens of Foraminifera were observed. Mid~le. Like top part of core. -Bottom. . s'andstone, light"greenish-gray, fine-grained, -highly micaceous, containing inclusions of flaky green shale and small fragments of carbonaceous material that is highly pyritic in small scattered areas. ' Shale, gree~, flaky and- many cavirigs from higher levels. -' - --- ' ' ' - :--1 V Like sample at 2940-2955 ft., and many fragments of Ostrea sp. that are probably faVings. Shale, flaky, ., many fragments '> of -Ostrea sp., and fragments of white, fine~grained, well--sorfed sandstone that contains a little light-green ghl:uconite, mica, and a few fragments of Ost;:ea sp. LOGS OF SELECTED WELLS IN THE COASTAL PLAIN OF GEORGIA 191. Depth (feet) Description . . t.'. '- 2985-3060 No change. 3060-3075 Like sample at 2970-2985 ft. and m addition, inany moderately large fragments of brown, fibrous, carbonaceous material. 3075-3120 No change. 3120-3135 Shale, flaky; arid sandstone as described in the immediately preceding sample. The sample also contains fragments of oyster shells and large grains of quartz. 3135-3150 No sample. 3150-3160 Like sample at 3120-3135 ft., and also very coarse grains of quartz and some grains 0~ pink feldspar. 3160-3210' No change. .. 3210-3225 Like sample at 3150-3160 ft., about 50 'percent, and about 50 percent fragments of dark-brown carbonaceous material. 3225-3255 3255-3270 No change. Shale, greenish-gray, and some bluish-green shale;"' a little coars~ . grained sand and carbonaceous material like the sample at 3210-3225 ft. 3270-3315 Samples not described. 3315-3330 Like immediately preceding samples, but the shale is more micaceous and irregularly sandy (very fine grained sand). The only fossils seemed to be caving from beds of Austi~ age. ; 3330-3345 Like sample at 3315-3330 ft., and in addition, specimens of Gum:~e-: lina sp. that are characteristic of the upper member of the At- kinson Formation (Eagle Ford age). . 3345-3375 Like sample at 3330-3345 ft.; also fragments of Ostrea sp. and .of cabonaceous material, all of which. may be c"aving. , .,. ' - :.- Atkinson Formation. Lower Member. 3375-3420 3420-3435 3435-3465 3465-3480 .t 3480-3495 3495-3510 The top of the lower member of the 'Atkinson Formation is placed at 3360 ft. on the basis of electric log correlation. -' '-" Samples not described. '< The sample is composed of material similar to the immediately pre. ceding samples, and, in addition, fragm ents of darker gray;flaky, ,. unctuous shale that resembles the characteristic "marine shale" of the 'Tuscaloosa Formation. .1 Samples not described. . " ~: . Shale, da1k-gray, flaky, somewhat carbonaceous, is strongly domi- nant in the sample. Specimens of Foraminifera in the sample seem to be caving_from much higher levels. f:u No sample. . . '. Shale, grayish-green, flaky, slightly micaceous. The sample con- tains one specimen of Trochammina rainwateri which is char- acteristic of the lower member-of the Atkinson Formation (Wood- bine age). The base of the "marine shale" of the Tuscaloosa is ;: 192 GEORGIA GEOLOGICAL SURVEY BULLETIN 74 Depth (feet) De8cripti01i placed at 3500 ft. on the basis of.electric log correlation. : 3p10~3525 ' I' Like, saniple at 3495-3510 ft., -and, in addition "the sample contains '. . , .>!1 . specimens of -species of A mm.obaculites agrestis that are char- acteristic of the lower member of the Atkinson Formation; .. 35- 25. -3540. I . '; . ., 3540-3570 Sa~ple is : mainly .shale, hut contains,_also, fragments of white, . fine-grain~d, . somewhat glauconitic sandstone. No change. , 3570-3585 Sample contains much gray flaky shale,. and .some coarse-grained. . = ~ .-, :: 1. . : . sand. Many,..worn fragments of Ostrea sp. and other bivalves,. with attached sand grains are also present. The shell fragments seem to be indigenous 'in beds near this depth; they are chalky, anq grains of gla~co~ite a~d phospha~ic grain~ are at~ached to " :; them. { :... . ~ , .... , .. ~ '"!' 3585-3615 ... ' Samples not described: 3615-3640 Shale, flaky, is the .dominant material;, siderite p~nets, some glau- <' . 'r. -::-' :<,._ . conitic sandstone; and some shell fragmen.ts are also present'. .. \ . Comanche Series undifferentiated 3640"3660 11 . Shale fragments, :like sample at 3615-3640 ft., .some coarse-grained ::., = .{ i sand, and a few fraginents of red, highly ferruginous clay. 3660-3675 s No ~sample. of :n;75!.3'690 'J! Like l sample' 'at 3640-3660 ft., and many small' . ~~agments ':red .. :, 0 i , j '(; and mi.Jstard-colo~ed clay. r a690-3705 Clay, gray, that m~y b~ caving, and:small fragme~ts brick-red clay. sind, S70S~372'iF . coarse, subanglilat, contai~in1t a 'few pi~k grain.ii, a fe'Ji greenish-yellow grains;; and~a few grains of feldspar. 3720-3810 3810-3825 No change. . , . ..... ~ l :. ~ .6 . .. . . ' .Sand, coarse, like sample at 3705-3720 ft.; pink and yellow grains ;: -.. .,'t: ;- ; .~.: ..: are more abundant, . . .. .' -' ' - -. 3825-3870 No' ch'ange. 3870-3885 Sand, coarse, like sample at 3810-3825 ft.; greenish-yellow grains -,, . ; - . -. . 1 .:. " very abundant. ,,: 3885.:'3960 . ~- . No' change. - ; .' 1 ...._, :. . " ;- ' "" S960~3975i 'salid, like sa~ple . at 3870~3885 ft.; 'and 'a'fragment of mulberry- colored, somewhat micaceous clay~shale.' - :' 3975-4200 Samples are, mainly, sand like't_he preceding samples, and a few - i.t: / ,;Iwr.:.>,.':.. :scatte.red fragments .of gray, ' hard, den'se, very fine,. grained d : : ' .:! cri . ' sandstone. .: .:< ..1 ~.. ,() 4200-4210 Sand, like thesample~ at 3975-4200 'ft., arid the highest occurrence of multicolored (gray, purplish-red, and mustard-colored) ;~ ~ery . H,-, '-v~ ..-- 1 ;finely ,and .highly micaceou~ s~ale,- . The Il)ulticolored shale'~ccurs ,.,l. " .1 JL . I - in the upper part ~f. the .Comanche Series;in ~any wells in the - \. ,. , , .: llti .... southeas~rn Gulf region. , --. :. . . 4210-4250 . , .Samples .not described. . .~ Lomi OF SELECTED WELLS IN THE COASTAL PLAIN OF GEORGIA 193 Depth (feet) 4250-4251 " '"-' Description Core. Recovery? -~ ' :. ~ -::. Sand, quartz', very fine to moderately coarse,"a'ngular, and about of . 50 percent fragments brown and green streaked ferruginous clay shale. . . :: ;J;)..:. ;.~. . 4251-4270 . Samples not described.' 4270-4285 ., \ Sand, fine to coarse-grained, and many fragments of gray and of brick-red streaked, finely micaceous, highly sandy (very fh1e grained sand) clay; also some fragments of"raspberry-colored clay shale: 4278-4288 . Core. Recovery? :.' Top. Sand, pink-stained, fine-grained, moderately well sorted, and many flakes of colorless and colored mica. Middle. Sand, etched, fine-grained, moaeratelywell sorted, about 10 percent pink grains, and a few grains of feld~par; gray mic'a flakes are abundant; brown,. gray an'd .green mica. flakes are common. B.ottom. Sand, fine-grained, and small fragments of dark brown- " ish-red and yellowish7green,. sandy, micaceous clay. 4288-4298 ~ .o~x Core. Recovery? ... ' ~ , .:- ~ Top. Clay, highly sandy (very finecgrained sand), highly mica- ceous, highly ferruginous. . '>Jt " ,;: } J . ., ,, 4298-4308 .~ ,.i. ... Bottom. Washed sample. Sand, pink-stained, fine-grained, ' angli- lar, well-sorted, and mica (mostly colorless). Core. Recovery? ,J~ .:. ~ Top. Sand, quartz,. fine to coarse-grained; . roughly '.' an:gular'; some greenish-yellow and some p~nk grains of feldspar; a little mica. .:.. ; 4308:-4318. Another part of core. Clay, red-brown, streak'ed with bluish- gray and yellowish-green areas, m- .... i ' c a c. e. o ~ u s ; ' h i - gh- l y sa:rtdY ' - (very ,~ fine-grained, sand) ... ., ..1: . , , )J < . Core. Recovery?'r~ . ,m:ctv:; '! ' ;,.. ,, Top. Sand, poorly .sorted, very fine' to very .coarse grained; many greenish-yellow grains; so~e ~.e~4!':!Pflr~ ..,_ .. :!_. '.,!-. ,~ ,L. ,. Bottom:., Sand, like .top part of core but contains some mica. 4318-4328 Core. Recovery? .!= . Top. Sand, fine. to, very coarse grained; many greenish-yellow grains and some pink grains; feldspar common. Bottom. Clay,: greel'l-ish~gray, highly sandy (:very fine grained sand), highly _micaceous. Much of the , mica is dark (brown, gray and green)' but some is colorle,ss. .. ....,: ' ' 4328-4338 :.Core. Recovery? _,-,, , . Top. Sand, fine to coarse-grained. Bottom. Clay, red, sandy (fine to moderately coarse grained). 4338-4348 Core. Recovery? ,, .; . Clay, 'tan, sandy. (fine .to coars~ grained sand); many sand ,. _grains are etched. "'. ~~; 194 GEORGIA GEOLOGICAL SURVEY BULLETIN. 74 Depth (feet) 4348-4358 4358-4368 :~ 4368-4378 4378-4388 I 4388~4398 4398-4405 4405-44~Qj .4405-4420 ' 4420-4440 . . 4440-4460 4450-4460 ) . 4465-4480 4460-4470 Descriptipn Core. Recovery? .- Clay, bluish-gray and yellowish-brown streaked, hard, sandy (very fine grained sand), highly micaceous. Core. Recovery? Sand, fine to coarse-grained, roughly angular, somewhat mica, ceous. Core. Recovery?. Sand, fine to moderately coarse grained; many greenish-yellow grains and some feldspar; a little mica. Core. Recovery? Top. $a~d, mainly fine-grained and a few coarse grains; a little mica. Middle. Clay, brick-red, streaked with bluish-green areas; highly micaceous. Bottom. Clay, red, sandy, very highly micaceous. The flakes of mica are coarse, and green and brown flakes are cpmmon. Core. Recovery? Bottom. Sand, mainly moderately fine grained, poorly sorted. Many sand grains are greenish-yellow and a few are pink. Both colorless and colored flakes of mica are present. Sample not described. Core. Recovery? Sand,. coarse-grained; many greenish-yellow grains; a few grains of tourmaline (?); a little mica. Sand, coarse-grained; many grains are greenish-yellow. The sample contains cavings of gray clay and varicolored micaceous clay. No change. Cot:e. Recovery? Sand, fine to coarse-grained, green, brown, and gray flakes of mica are common, some of which .seem to show transition .to glauconite. Core 23. Recovery 3% ft. Top 1% ft. Sand, quartz, fine to medium-grained, in a matrix of gray clay. r Middle 1 ft. Like top part of core, But fine grains are strongly dominant. Bottom 1 ft. Sand, quartz, fine to coarse-grained, roughly angu- lar, in a matrix of gray .clay; medium grains are dominant. Sand, quartz, fine to coarse-grained, roughly ~ngular; coa:r;se grains are dominant; a few grains are pink,oa few are yellow. The sample contains a few fragments of dark-red and grayish- green mottled, micaceous shale. ". Core 24. Recovery 7 ft. \/ Sand, quartz, fine to coarse-grained (medium grains dominant) '1 in a matrix of gray clay. The sample contains a few tinted - .2- -- . I :i;...QGS OF SELECTED WELLS .IN THE COASTAL PLAlN OF GEORGIA 195 Dept h (feet) 4470-4480 4480-4490 4490-4500 4495-4510 4510-4525 4525-4555 4555-4570 45.70-4585 4580-4590 4585.-4600 4600-4615. 4615-4630 4630-4645 4645-4660 4660-4690 4690-4705 4705-4735 4735-4750 .4750-4765 Description grains, and a few grains of feldspar. Core 25. Recovery 3 ft. 2 in. Clay, red and greenish-gray, micaceous; highly silty, and gTay, highly sandy (vel'y fin.e-grained sand) , micaceous clay. Core 26. Recovery 4 ft: ,., . Top 2 ft. Shale, r ed and grayish-green, mottled. Bottom 2 ft. shale, red and grayish-green, mottled, unctuous. Core 27. Recovery 1 a ft. Sand, quartz, light-gray; soft, fine to medium-grained, argillaceous; mica common. Sand, quartz, coarse-grained; some feldspar. About 25 percent of the sample is red and green mottled shale. Washed sample composed of coarse~grained sand,, like sample at 4495-4510 ft., and a few fragments of red and grayish-green mottled shale. No change. Sand, like sample at 4510-4525 ft., and about 25 percent red and gray mottled, finely micaceous shale. Sand . and about 10 , percent shale,! like sample at 4555-4570 ft., some cavings. Core 28. Recovery? Sand, quartz, fine to coarse-grained, in a matrix of soft white clay; niedi urn grain's are dominant; a few tinted grains, and ' a few grains of feldspar are present. Washed sample; composed of fine to coarse-grained quartz sand and some feldspar; coarse gTains are' common. The sample con~ tains many cavings of material from the Gulf Series. Like sample at 4585-4600 ft., and in addition, a few fragments of r ed and gray mottled shale. No change. Like sample at 4600-4615 ft., and in addition, a f ew nodules of red-stained limestone. ' Sand, quartz, fine to coarse-gTained (coarse grains common); some sand grains are tinted yellow ~nd some pink. The sample contains a f ew grains of f eldspar and a few fragments of red and gray mottled shale. No change. Mainly sand, like sample at 4645-4660 ft., and a few fragments of red chert. No change. Sand, mainly coarse grains; a few tinted grains; a little feldspar. The sample contains a few fragments of gray, moderately hard, highly micaceous, silty clay. Sand, like sample at 4735-4750 ft., an_d a f e.w fragments of red shale. 196 GEORGIA GEOLOGICAL SURVEY BULLETIN 74 Depth (feet) Description . 4765-4774 ' No change. i 4774-4780 . Core 29. Recovery 5% ft. i" Top 6 ft. 3 in. Sand, quartz, fine to coarse-grained (fine to medium grains doniinantr, argillaceous, and some feldspar, in a matrix of white, bentonitic clay. . . Bottom 3 iii.. Clay, mottled red, 'iray, and mustard-colored, mi- caceous, somewhat~ sandy. 4780-4790 Core 30. Recovery 8 ft. Sand, light-gray, micaceoue, fine to coarse-grained (medium grains dominant) Sand, -fine to coarse-grained (coarse grains dominant), mainly _qual'tz and some feldspar. Some sarid grains are tinted pink and some _yellow, , , 4810-4890 No: change. -' 4890-4900 Core 31. Recovery 3 ft. Sand, gray and red, soft, fine-grained,. argillaceous. 4900-4915 . .4915-4930 Sample riot described. Sand, fine to coarse-grained, and about 10 percent fragments of dark purplish-red, gray-mottled, very finely micaceous shale." 4930-4987 4987-4989 -"". 4990-5005 No change. Core 32. Recovery? ... _. .,j,. Sand, clear quartz, etched, coarse-gr8.i~ed, in a matrix of soft 'white ashy clay. Sand, fine to coarse~gr'ained and about 25 percent fragments of red shale~- : - ., ~ : 5005-5020 .. Sand, fine', to coarse-grained. About 10 percent of the sample is composed of red shale. The sample contains many cavings. .I ~ -- -. . . . ' I ,. ' . l :~, " 5020-5035 Sand, about 50 percent. of the sa~ple; cavings about 50 percent; I a little red shale. ' ' 6035-5050 6.035-505d' 6050-5065 6065-5080 No change. No change. ., Small washed sample c_omposed of about 50 percent sand,_ and 50 percent red shale. No change~ ,.. 5080-6095 Mainly sand, about 50 percent coarse grains, and 50 percent fine grains. 5095-5110 Shale, red, about 75 percent; sand about 25 .percent. 5110-5125 Sand, coarse and fine-grained in roughly equal amounts constitutes about 75. percent of the sample; about 25 percent of the sample is composed of red shale and a few nodules of limestone. 6125-5155 5155-5170 Sand, like the Samples at 5110:5125 ft., and about 10 percent red shale. '"' .:l ',f Sand, like sample af 6110-5125 ft., . a few nodules of limestone, ; and 50 to 75 percent dark-red, very finely micaceous shale. , LOGS OF SELECTED WELLS IN THE COASTAL PLAIN OF GEORGIA 197 Depth . (feet) Description 5170-5185 No change. 5185-5200 Sand, many nodules of limestone, some of which are red-stained, and about .10 percent red shale. 5200-5230 No change. 5230-5245 Sand, nodules of limestone, and about 25 p'ercent dark-red shale, like the sample at 5185-5200 ft. ,. : 5245-5260 .,, Sand; nodules of limestone, and about 5 percent red shale._ 5260-5290 No change. 5290-5305 . ' . No change in materials, but red shale composes "about 25 percent of the sample; ,, , t,: 5305-5320.' . , . No change; j ' 5320-5335 Sand, fine to coarsecgrained, rriany nodules of limestone, some of which are red-stained; a little red shale. 1 5335-5350 ;.- .. ,:.- Sample contains red shale, soine nodules of limestone, and a little sand, like the immediately preceding samples; 50 to 75 percent of the sample is composed of cavings of materials from various , . . levels in the Gulf Series. , .. . ' 5350-5625 No change. 5625-5650 Sand, fine to coarse-grained; nodules of limestone, and about 25 percent dark-red, finely micaceous shale, and some grayish-green, slightly red-mottled, illicaceous shale. 5650-5665 Mainly ._cavings. ~ , 5665-5680 Sand, nodules of limestone, a little red shale, and.abundant cavings. 5680-5695 Sand, many nodules of limestone, a little red ;shale, abundant . , cavings. ; No change;'' Shale;' dark-red; finely micaceous; is about 50 percent of the sam- ple; 50 percent is composed of' a little sand, many nodules of limestone, and abundant cavings. .~ 5725-5740 . hrcLike sample at 5710"5725 ft:, but the red shale is about 25 percent ' - of the sample..: : -r' 5740-5830 No change. 5830-5845 Shale, dark-red, micaceous, is about 50 percent of the sample; 50 percent is composed of. a little sand, many nodules of limestone, and.abundant c.avings.- Many of the limestone nodules are sandy. 5845-58~0 ,. No change. 5890-5905 The indigenous material seems to be a conglomerate composed of pebbles of varicolored quar~zite, but amber is the most com- . mon color. The individual grain-size varies in different frag- ments of the quartzite. Other materials in the sample are sand, nodules of limestone, fragments of red- shale, and cavings, all of which,occur in the immediately preceding samples. 5905-5920 5920-5935 No change: Mainly cavi~gs and a little .red shale. , 198 GEORGIA GEOLOGICAL SURVEY BULLETIN 74 Depth (feet) 5935-5950 5950-5965 5965-6025 6025-6040 6040-6130 6130-6145 6145-6190 6190-6205 6205-6220 Description Like the sample at 5920-5935, with the addition of a few nodules of limestone. Like the sample at 5935-5950, but with the addition of fragments of green shale, and an increase in tlie amount of limestone nodules; Some of the nodules are sandy. No change. Like the sample at 5950-5965 ft., with the addition of a few fragments of chert and a few fragments of quartzite. No change. Shale, red and green mottled; many nodules of limestone; a little sand (including a few fragments of green pebbles), a few coarse grains of chert, and a few of quartzite. No change. S,hale, red and grayish-green mottled; some cavings. Shale, red (in part bright-red), and some mottled red and grayishgreen; many nodules of limestone; fraginents of chert; fragments of quartzite; fragments of green slate ( ?) , and other materials_ Triassic ( ? ) Upper Triassic (?) Newark (?) Group 6220-6250 Like sample at 6205-6220 ft., but bright-red shale is much more common. 6250-6295 No change. 6295-6310 Shale, bright-red, moderately hard; a little sand, nodules of limestone, and fragments of chert, like the sample at 6205-6220 ft. The red shale shows a little mottling of light grayish-green, and contains a few pebbles. 6310-6385 No change. 6385-6400 Shale, bright-red; slightly grayish-green mottled, and many fragments of light-pink to gteenish-gray, fine-grained micaceous sandstone. 6400-6410 No sample. 6410-6415 Like sample at 6385-6400 ft. 6415-6430 Shale, like sample at 6385-6400 ft., a few nodules of limestone, and a few fragments of pebbles of various kinds of material. 6430-6510 No change. 6510-6~25 J Shale, bright-red with light-g1een mottling, like samples beginning about 6205"6220 ft. The shale contains irregular-shaped nodules of siderite ( ?) and a /ew fragments of chert. 6525-6540 6540-6550 I 6550-6560 Like sample at 6510-6525 ft., but siderite seems to be absent. No change. '> , Shale, like sample at 6510-6525 ft., and m'any fragments of diabasef / some of which is possibly weathered. _ '~ r LOGS OF SELECTED WELLS IN THE COASTAL PLAIN OF GEORGIA 199 Depth . (feet) Description 6560-657P, .Like . sample at 6550-6560 ft. hut contains less diabase. 6580-6640 No change. 6640-6650 Shale, red; much less diabase than in tli.e samples beginning at 6550 ft.; many fragments of light-red, fine-grained, argillaceous sandstone. 6650-6660 Like sample at 6640-6650 ft., but contains less sandstone. 6660-6670 Shale, red, mottled with green areas; some diabase that is prob- ably caving; very little . sandstone; a few fragments of red ~~ ' 6670-6680 No change. 6680-6690 Shale, red, mottled with light-green areas; a few fragments of chert pebbles; a few cavings of diabase. The shale is a somewhat duller shade of red than in the prect;d\ng samples. 6690-6780 No change. 6780-6790 Shale, and a few eavings of diabase; a few fragments of pink, moderately hard, fine-grained, argillaceous, micaceous sandstone. 6790-6800 No change. 6800-6810 .Shale, like sample at 6780-6790 ft., and in addition, a few fragments of light pinkish-tan, fine to medium-grained sandstone containing colored grains of different kinds of material!' that give the sandstone a finely speckle~ appearance. 6810-6820 No change. 6820-6830 Mainly shale; a few fragments of sandstone, like sample at 6800- 6819 ft.; a few cavings of d~abase. ' 6830-7030 No change. 7030-7040 7040-7059 Shale, red, somewhat green-mottled. No change. ' !et ~-. " .I Tertiary and Quartemar;i_' .. , Pliocene(?) Series tO Recentq) _Series -::,.k I Undifferentiated -~ . - 5 Sand, deep-orange, argillaceous. Washed residue;large. Clear, su_bangular, moderately fine, mod- erately well sorted sand, and a few fragments of clay matrix; no fossils. ' 15 Sand, like sample at. 5 ft. 25 Sand, lemon-yellow, argiilaceous. Washed residue, large~ Fine-grained, angular, well sorted quartz simd, containing a few hard, fragments ~f clay inatrix; no fossils. >The occurrence of specimens of Lituonel/a floridana, the abundance of specimens of Dict-joconus jioridanus, and the absence .of specimens of typical Oligocene species in the samples from 286 ft. to the bottom of the hole, suggest that the rocks in this 19-foot interval may be middle Eocene (Avon Park Limestone} rather than Oligocene in age. Nothing in the samples suggests the well penetrated beds of upper Eocene age. . . ' . c.... .' . ~~ LOGS OF SELECTED . WELLS IN THE COASTAL PLAIN OF GEORGIA 213 Depth (fee,t) Description Tertiary ... -. t:": ..... MiOcene Series undifferentiated ' 35 Clay, white, sandy. . ,. .,~ ,J Washed residue, small. Fine-grained, angular, clear quartz sand, and a fey; clay nodules. 45 Cl!iy, white and very light green, chalky. Washed residue, moderately small. Fine-grained, angular, clear quartz sand, like the sample at 35 ft., a few fragments of in- ~ durated clay, "and"about 25 percent 'sman; white, chalky nodules; no fossils. ~~ ~.:. \ :. !:, ' . - -~ . .. 55 Clay, light-green, sandy, slightly calcareous. Washed residue, large. Clear, angular, fine-grained, quartz sand, and about 50 perce~t small nodules of clay. . . , 65 Like sample at 55 ft. 70 Like sample at 55 ft. 80 .... 85 ~ J, .. (( Like sample at 55 ft. Clay, light~greenish-gray, sandy (fine-grained sand), somewhat calcareous. Washed resid_ue, moderately large. Very finecgrainj,, ed, angula~. ci"ear quartz sand, and about 25 percent fairly large, greenish-gray nodules of limestone; no fossils." 95, ' : ;_ , I ~ Clay, greenish-cream, hard, sandy, bentonitic. Washed residue, . ..moderately large. Fragments of sandy clay, ~nd about 50 percent : fine-grained, angular, clear quartz sand; a few chara stems. 106.. ' , . ' Clay, cream, hard, sandy (fine-grained sand) calcareous. Washed 'r.esidue, large. Fragnients of clay, and about-:50 percent mod- .... ei-a.tely fine g;rained, moderately well sorted angular, clear quartz . . sand; a few.specimene of arenaceous.Foraminifera, possibly of . ' ' ~ ; _brackish-water or~gin~ 110 Like sample at 105 ft., but no Forami~ifera p~esent. .115 ' .p . ; . i. 125 .. .;, Clay, light yellowish-green, sandy (fine-grained sand), finely ., graimlar, calcareous ~lay, containing a . very few questionable specimer'ls of arenaceous Foraminifera. Limestone, cream,hard, slightly sandy; irregularly porous (water. . worn?) ,. containing fra.gments of molds and fragments of im. pressions of bivalves (Pecten sp. and .others) ; a few traces of specimens of small-Foraminifera, but no determinable species. "136" 145 ' ~- 155 Limestone, white '(chalky), sandy (fine-grained sand), porous !) (water-worn?), nodular. The .sand content of .the limestone is , ;t about 25 percent.. The limestone seems to have been originally highly fossiliferous, but much of the fossil material may have been destroyed by .percolating water, leaving only a very few poorly-preserved. fragmenta:ry casts and" molds. . Lik~ sampl~ 'at 136 ft. . Limestone, white; chalky, hard, somewhat sandy, showing a few fragments of fossil molds. ' 214 74 GEORGIA GEOLOGICAL SURVEY BULLETIN D epth (feet) Description 165 Like sample at 155 ft. 167 Limestone, deep-cream, dense, cryptocrystalline, somewhat sandy, showing a very few questionable' sections of microforams. 170 Like sample at 167 ft. 173 Like sample at 170 ft., and, in addition, a few fragments of white, I soft, sandy, finely granular limestone. t Oligocene Series Upper. Oligocene. Suwannee Limestone. 176 Limestone,- white, very finely granular, slightly sandy, and a few nodules of deep-cream, dense, limestone. The sample contains a few fragmentary casts and impressions of fossils, among which are a f ew echinoid spines, bryozoan fragm ents, and many calcite- encrusted specimens of smaller Foraminifera. Small-mesh scr eenings of the sample contain about 10 percent fine-grained, angular, clear quart zsand. 180 Limestone, similar to the sample at 175 ft., but the fossils are more abundant, and small calcitic nodules are common. The fauha contains fragments of echinoid spines and plates; a cast of Opercu lin ella (?) sp.; many specimens of Dictyoconus cookei; and a fauna of small Foraminifera.. Among the small Fora- minifera specimens of Rotalia m exicana var: and Asterigenna subacuta are the most common species; several species of milio- ..., lids are also present. . 183 Limestone, whit~, calcitic, hlghly microfossiliferou~; many of the frag'ments contain a large number of specimens of miliolids; echinoid spines are common, and the foraminiferal fauna is like that in the sample at 180 ft. This sample also .contains many small calcitic nodules, and a few fragments of dense brown 3 limestone. 190 Limestone, white, porous, high.ly microfossilifeious, having an oolitic appearance because of the abundance of molds of speci- mens of small Foraminifera. The sample also contains a few nodules of ' light-brown, granular, dolomite or dolomitic lime- . stone. The .fossil mate1ial occurs, chiefly, as calcite molds that are usually lime-encrusted. Specimens of miliolids are common, as in the sample at 183 ft.; specimens of a large Q~tinquelocu lina sp., and specimens of Asterigerina subacuta are common. 193 Limestone, white, chalky, microfossiliferous, and !1 few nodules of brown, cryptocrystalline - limestone ; fa1,1na is like that in the sample at 190 ft. 197 Limestone, white, hard, nodular, somewhat calcitic, slightly porous, contain-ing a number of poorly-preserved casts of macro-fossils and microfossils. The material and the fauna are similar to those described in the ' sample at 190 ft. Asterigerina sp. is the most abundant microfossil. ' LOGS OF SELECTED WELLS IN THE COASTAL PLAIN OF GEORGIA 215 Depth (feet) 200 203 .'. 207 21.4 . 218 Description .Limestone, white, chalky, .porous, microfossiliferous, having an oolitic appearance because of the abundance of poorly preserved molds of specimens of miliolids and other small Foraminifera. The sample contains nodules of calcite, and the fauna is similar to that in the sample at 197 ft. Limestone, white, chalky,:highly calcitic, somewhat porous, fossiliferous. The fossils a1e very poorly preserved in the form of molds and casts that are usually fragmentary and chalk-coated. The recognizable fossils are the same as those in the immediately preceding samples. Limestone, white, chalky, porous, highly fossiliferous. The fossils are usually in the form of chalk-coated molds and fragments of molds. Among the common and recognizable specimens of Foraminifera are Aste1-igerina subacta, Rotal1.a.mezicana var., , and Dictyoconus cookei. Like sample at 207 ft. Miliolids are more common in the fauna in this sample than in the sample at 207 ft.; otherwise the fauna is the same. Like sample at 214 ft. Middle(?) or lower(?) Oligocene Vicksburg(?) Group . i 228 . . Similar to !i'ample at ' 218 ft. The sample contains many bryozoan fragments; and a few fragments of L epidocyclina sp. Specimens of Asterigerina sp., Rotalia cf. R. mexicana, and miliolids are. commori. 237 Like sample at 228 ft. 247 Limestone, white, hard, highly calcitic, microfossiliferous. The r fauna seems to be, in general, like that.in the sample at 237 ft., although few of the fossils are identifiable; Rotalia cf. R. me:~:i- '' .:.; .;! :.ti . cana is the most common identifiable species. , 257 Limestone, porous, highly...fossilifero~s. The fossils are ' usually poorly preserved in the form of molds and casts. Bryoz.oan fragments are common, and the fauna contains many sp~cimeris of , . miliolid Foraminifera and Rotalia cf. R . m~x_icana. .,. , 267 Like sample at 257 ft. The sample contains several specimens. of Dictyoconus co.okei, a few fragments of Lepidocyclina ~sp.; and specimens of small Foraminifera, as in the preceding sample. 276.5 ' 286 Like sample at 267 ft. Specimens of Dictyoconus cookei are common at this depth; the small Foraminifera are like those in the t sample at 257 ft. .. Similar to the sampl'e at 276.5 ft. but the limestone is harder and more calcitized; a few nodules of dark-brown dolomite are present. The fauna contains many bryozoan fragments .and abundant sp ecimens of Dictyocan7(8 floridanus; echinoid'_spines and \ . ,, . 216 GEORGIA GEOLOGICAL SURVEY BULLETrN 74 L Depth (feet) Description fragments are..common.; also occurring are .a few fragments of Pecten sp., several specimens of Lituon.ella floridana and Pseudochrysalidina flw1driria, and spedmens of -two species of large miliolids. ,. l . 296 Limestone, cream, calcitic, poroUs, highly fossWferous. The fauna seems to be similar to thaUn.:the sample at 286ft. but there.are .: few well-preserved specimens. 298 Material and fauna like the sample at 296 ft. and, in addition, many fragments of dark-brown granular dolomite. 300 ' .. 305 T ;D. Dolomite,. dark-brown, granular, composes most of the sample. A few fragments of white-, calcitic, highly microfossiliferous 'lime- stone are possibly caving from higher levels. Dolomite, dark-brown, granular, p~ro_p's~. co~poses most of the sample. In . addition, the ' sam~le contains fra'gments of calcite, fragments of white fossiliferous limestone as in the sample at 300 ft., and fragments of white, ha'rd; sandy limestone showing impressions of a few fragroimts of macrofossiis (Pecten sp.) ;f THOMAS COUNTY " ~- Owner: City of Meigs, Ga. GGS. No. 59 Elevation: 340 (approx.) Total Depth: .1530 ft. - . ,) : Co -. m. ple'te. .d.. : t:' . ..... .:r . 9 ~ 1 .\ ..' t,-; - Summary of Stratigraphy .Tertiary (feet) (feet) Depth . Thickness Mioc~~~ , undiffere~tiated. , ~--. __ ._ ___:_____:_' ___:_..___ 25 459 .. ...: . ; (1st sample) . Oligocene , . .: . . ..upper, Suwanne~ Limestone - - - : ______:_--~~~-'----- . '484 . 102 n;tiddle'('?) or lower(?), Vicksburg(?) Group~----~.:__ 586 80 ,. -- ' . I - "O' ligocen.e ( ?) Eocene .' orEocene ( ?) ---- ----------~---- ---~--------------~ < 666 149 . upp~r; .'ocala . Limestone, upper memb~r __________ ..;_ 815 ? .. . I1() samples fr,om 8?5 ,to 1320 ft. . . ,. , 1.:~ middie ( ?) ,' undifferEmtiated' -----~~--~- , 1320 to total . 210 ( ?) ' 4: . .. . ., . ~. . ~ .... ";: ~ depth <( . Lithologic and paleontologic description of cut-!- tings .and cores. Samples .are . cuttings unless otherwise stated. ,. , .... ~, LOGS OF SEI..ECTED WF,:LLS IN THE COASTAL. PLAIN. OF GEORGIA 217 0- 25 . . consolidated; apgular, clear quartz sand; no. fossils. . 302- 312 ~ .l 312- .320 Like sample at 293-302 ft., and also a few fragments of greenishgray sandy clay. No samples. 320 334 ' :~ Like sample at 302-312 ft., but about 75 percent of sample is fine to coarse-grained, angular, clear quartZ sand. . 334- 346 346- 365 . ; .. 365- 388 388! 4l;7 No samples. Limestone, cream, hard, sandy, containing fragments of molds, and impressions of fragm ents of fossils. One chip of limestone show- '"' ed a few fairly well preserved sections of Archaws sp. Abo.ut 25 percent of the ~ample is composed of fine-grained sand and a little tan Clay. .No samples. Sand, quartz, ,angular, very poorly..sorted; a f'ew fragments of \ I 218 GEORGIA GEOLOGICAL SURVEY BULLETIN 74 Depth (feet) Description cream, argillaceous sandstone; a few fragments of sandy limestone like sample at 346-365 ft., no fossils. 417- 459 Limestone, cream, irregularly sandy, a few fragments of which show indistinct impressions of fossils. About 25 percent of the sample is composed of coarse-grained quartz sand. 462- 484 Limestone, hard, sandy, irregularly porous, containing a few im- \I pressions of fossils, and a few hard greenish-gray areas. About t 10 percent of the sample is composed of unconsolidated quartz sand. . . 484- 511 511- ' 586 Oligocene Series Upper Oligocene. Suwannee Limestone~ Limestone, cream, hard, porous, somewhat glauconitic, highly microfossiliferous. Macrofossils are, chiefly, fragments of Pec- ten sp. and echinoid spines. Among the many poorly-preserved foraminiferal specimens, the most com~on species are Rotalia mecatepecensis, Asterigerina subacuta, Gypsina sp., and a fr~g- (,; ment of L epidocyclina sp. , Limestone, white, hard, containing many specimens of Lepidocy- clina undosa, Camerina dia, Elphidium cf. E. Chapmani, and Asterigerina subacuta. .- Middle(?) or lower(?) Oligocene. Vicksburg(?) Group. 586- 606 Limestone, white, gray-spotted, hard, nodular, highly fossiiifero~s. Macrofossils are, chiefly, bryozoan fragments, echinoid spines and crab claws: Among the microfossils,' the common species of Foraminifera are L epidocyclina undosa, Camerina dia, Asteri- .I gerina subacuta, L epidocyclina mantelli, Rotalia m ecatepecensis, Elphidium cf. E. chap11tani, Asterigerina sp., Cibicides choctaw- ensil, and Eponides alabannensis. .. 606- 632 Limestone, cream, nodular, in part fineiy crystalline, and about 10 percent coarse-grained quartz sand. The fauna contains echinoid spines, specimens" of Ro,talia .sp. and Asterigerina sp., a few specimens of Camerina sp. and a few small fragments of Lepidocyclina sp. 605- 620 Core. Limestone, white, chalky, gray-spotted, microfossiliferous, partially calcitized. The fauna contains many echinoid spines, and specimens of Rotalia mecatepecensis a!J.d Asterigerina subacuta. . 620- 641 Core. Limestone, deep-cream, gray-spotted, hard, porous, partially calcitized, highly fossiliferous. The limestone seems to have been altered by percolating.water. The fauna, which is similar to that 'in the samples starting at 586-606 ft., is characterized by large echinoid spines, specimens of Rotalia mecatepencensis, and poorly preserved specimens of L epidocyclina sp., Camerina LoGs OF SELECTED WELLS IN THE CoAST.Ai. PLAIN OF GEORGIA 219 Depth (feet) 641- 666 Description sp., and Massilina sp. Many of the core fragments are composed of brown, coarsely crystalline dolomitic limestone that shows few traces of fossils. Core. Limestone, light-brown, hard, crystalline, containing soft, chalky, very poorly preserved molds of fossils fragme:nts. The fauna, which contains traces of Lepidocyclina sp. and Rotalia sp., seem~ to be related to the fauna in the sample at 620-641 ft. Oligocene (?) Series or Eocene (?) Series Middle (?) or lower (?) Oligocene or upper (?) Eocene. 666- 688 Core. Limestone, white, hard, calcitic, containing many poorly preserved traces of microfossils but no determinable forms. 688- 727 No samples. 727- 753 Limestone, brown, crystalline; a little water-worn(?) chalky, lime- stone; a few fragments of thinly laminated gray-green shale; \ ' and about 20 percent coarse-grained sand. The sparse foraminiferal fauna contains specimens of Camerina sp., Asterigerina sp., ~ . Lepidocyclina sp., and other species, like the samples starting ,, ... . 753- 770 ~ (".~ at 586-606 ft. Some of the cuttings in this sample, and possibly \. :': all the fossil material, may be ~aving from higher levels .. Like sample at 727-753 ft., with the addition of nodules of limoil.ite. The sample may be composed entirely of cavings. .770~ 796 1 Core. Dolomite, light-brown, granular, conta:ining abundan~ traces of chalky microfossils, all of which are too poorly preserved for identification. >A_: part ' of the cbre is composed of dense, .very finely granular dolomite that shows no trace of fossils. 796- 815. Core. Dolomite, brown, hard, dense, very f~nely graiJ,ular; no 'fos- - sils. 1 . ; Eocene .Seri.es '815- 835 ' 835-1320 Upper EO:Cene. Ocala Limestone. Upper Member. Core. Limestone, cream, chalky, contai~ing mariy specimens of Foraminifera. The common..species are Cibicides ocalanu,s, Rrrbulus alato-limbatus, Uvigerina dumb lei, Dentalina jacksoner;sis, Reussella sculptilis, S -iphonina _jacksone?tsis, C1-ibrogloborotalia marielina, Operculina mariCLnnensis,' A~omalina bilateralj_s, Robulus sp., Eponides jacksonensis. No samples. ' Middle(?) Eocene. Undiffe-rentiated. 1320-1630 T.D. Sand, clear quartz, moderately fine. grained, angular, highly glau- " conitic; containing fairly numerous specimens ofsmall Foratr~ini- ..;- ~-, ,.,.. - fera and Ostracoda. Among the specimens of Foraminifera are - -~ ,; ..,. Robulus alatrr-limbatus, R. alabamensis, R_. cf. R. pseudo-mam#- . -h' ... . . , ligerus,-Text1tlaria dibollensis, Globorotalia crassata densa, Val- ~ ~ > " vulineria persimillis, Globigerina rotunda var., Coleites sp.,. and others. 220 GEORGIA GEOLOGICAL SURVEY BULLETIN 74 . WAYNE COUNTY Operator: The California Company GGS. No. 52 Landowner: Brunswick Peninsula Corp. Elevation: 73 ft. (derrick Well 1 . floor) Location: Land Lot 7, Williams Survey_ Total depth : 4626 ft. 625 ft. from south line ; 2500 ft. from Completed: Dec. 17, 1944. west line of Land Lot 7. .. - Summary of Stratigraphy Tertiary ,. Dept h _(feet) Thickness . (feet) Not reported Cretaceous Gulf Beds of Navarro age ------------------------------------------- 2862 Beds ofTaylor' age ------ -----------------'--7--------~~------- 3497? Beds of Austin age ____---------------- - ---_ ______ 3571 . AtkinsonFo:rmation, upper member______---:-.--_ 3889 lower member______ ;_~-- _- 4308 635? 74 318 ' .411594 Comanche undifferentiated _______ __,___.____-_ _ 44'62 164 ':s Pre-Cretaceo~s( 1) ' "J . .... : .' , to Arkosic quartzite ------------------~-----.:.::.:...__c:.~--~----------L- 4570 total . 56 ' depth Lithologic an~ paleontologic description of cut- ! l tings and.. cores~ S~mples . are .- cuttings unless . otherwise stated. . , D e p th (teet) Description ; ! 0-2856 Samples not _reported. -1,I. 2856-2887 Cretacoous Gulf,Series I . Beds of Navarro age Sample is a mixture of sand, sandstone, gray sandy marly shale, and limestone, that are probably mostly caving. However, specimens ' of Globotrimcana cretacea, Gum~ elina striata, .and Gii1n- belina carseyae indicate the Cretaceous age of the beds. The top of the bed~? of Navarro age is placed at 2862 ft. on the basis of electric log correlation. - LOGS OF SELECTED WELLS IN THE COASTAL PLAIN OF GEORGIA 221 : Depth (feet) 2887-2903 . 2903-2990 2990-3000 3000-3011 3011-3071 3071-3086 3086-31.02' 3102-31,18 3118-3146 3146-3191 3191-3201 3201-3215 Description -Mainly fragments of cream, chalky limestone (Tertiary); 'fragments of light-gray, extremely fine-grained, calcareous micaceous, glauconitic sandstone; and some 'fine to coarse-grained loose sand. A few specimens of Navarro species of Foraminifera are in.the sample. No change. The quantity .of loose sand in the samples below 28562887 ft.. decreases progressively with de'pth, Core 4. Recovery ? Part A. Siltstone, slightly argillaceous, micaceous, carbonaceous, glauconitic, which grades into extremely fine-grained sandstone; contains specimens of Globotruncana cretacea, Gumbelina striata, and other Navarro species. Part B. Like part A, but sand is slightly coarser grained, and specimens of Foraminifera are slightly more aBundant; 'Globo- truncana and Giimbelina are dominant. Part C. Like part B. Sand, very fine to moderately fine-grained, loose, quartz; many fragments of buff to pink chalky limestone (caving); fragments ': of extremely fine grained sandstone (several types, caving from higher levels); nodules of glauconite; fragments of gray marly shale; specimens of species of Foraminifera as in the preced~g samples. No change. Materials like sample at 3000-301--1 ft.; specimens of Robulm sp. also in the microfauna. No samples. C' or~ . 5-: Recovery? Part A. SandstOne, brownish-gray, hard, dense, silty to extreme- ly fine grained, micaceous, glauconitic, highly calcareous; con- tain-s a fauna of small specimens of species of Foraminifera that are i10ndiagnostic, for the most part; a few typical Navarr() species occur in the sample. Part B. Like part A. Part C. Sandstone, gray, very fine grained, argillaceous, micaceous, somewhat glauconitic. Common species of Foraminifera are Globotruncana cretacea, Gumbelina striata, and Gumbelina carseyae. Washed _residue, small. Like sample at 3000-3011 ft. No change. No sample? Core 6. Recovery? Part A. Sandstone, greenish-gray, extremely fine grained, argillaceous, calcareous, micaceous, glauconitic. The microfauna consists, mainly of specimens of Globotruncana cretacea, Gumbelina spp., Pseudote:r:tularia elegans; fairly common specimens are D.orothia bullet_ta and' Clavttlinoides trilaterus; several arena- '' GEORGIA GEOLOGICAL SURVEY BULLETIN 74 Depth (feet) 3215-3221 t 3221-3283 Description ceous species of'Foraminifera characteristic of the Navarro-also occur. Part B. No change. Part C. Clay, gray; highly sandy (very fine grained sand), micaceous, calcareous. Fauna like part A of this core. Part D. No change. . . Sand; fine t~ coarse-grained, and many fr-agments of extremely fine grained micaceous sandstone and highly sandy clay; nodules A: of glauconite; cavings.:.of buff. to pink 'chalky limestone; micro- fauna .like part of core _6 _at 3_2~1-3215 'ft. . - ..f - ' ~. j No change. , 3293 """' . ~ . .; Bit sample. " Clay, gray, sandy, micaceous. 1 3293-3309 Core 7. Recovery? :"" -!'~"' ." . ~ 1 3309-3325 Parts B, C, and D. No change. ~ -- ' '~ " t I . . "" . ' 1 ... Very small sample, composed 'of fine to moderately fine grained' sand; a few fragments of very fiii"e grained micaceous sand- stone; fragments of the buff to pink chalky limestone; and a f ew specimens_of Navarro species of Foraminifera.- 3325-3358 ' Lik~ sample at S3Cl9~3325-':ft.,' ;iu~ the a~ditfon of afew fragments of gray marly shale. A few specimens of .Globotruncana forni-. cata are added to .the microfauna. . . ~ . , .. .:u~,"silty;a:rid ' thin' lenses . . . 1.,. of' light: i gray, fine-grained sandstone. No change in fauna. :.: - ' ;; Part B. No change. --' r ,. ''r :' { ::;< : : ! ' r- 3444-3460 Part C. No change. . .,: '"- .. _.;: -:~ ; t . . .. lH..~ . <: .. ,, ) Marl, green, somewhat sandy,.micaceous ; fragments of light-gray, . fine-grained sandstone ; about 25 percent' of sample is loose~ fin e- . grained .~and. . ' ' 3460-3495 No change. . .i LOGS OF SELECTED WELLS IN THE COASTAL PLAIN QF GEORGIA 223 Depth (feet) Description Beds of Taylor age . 3497-3510 Core .10.. Recovery?. Part A. Mad, tgray, hard, in part highlr sandy (fine~grained Sand) : . .. . :~ Washed residue composed almost entirely of specimens of Fora- minifera: Common species are: Globotru-iicana spp., Gumbelina spp., Loxostoma cushmani, Eouvigerina gracilis, Heterostomella americana. . The microfauna indicates the Taylor age . of>the beds..~ ,. Shaie, gray, marly, niica~eous' ; a little fine-giafned sand :and firie~ giafned, argillaceous sandstone. Fauna li-ke core 10 at 3497-3510 I ..' -I ft. '3526-3540 '!-'" Like saniple at 3514-3526 ft.~ With the fifa.una like core 15 at 3994-4004 ft. 4013-4081 ' Washed sample, small. Composed mainly of fragments of gray and some greenish~gray flaky shale, and fragments of light-gray, :fine-gra.ined, micaceous sandstone. The microfauna is 'like core 15 at 3994~4004 ft. .: 4081-4096 . ' This sample seems to mark a change from the deeper-water rna- rine facies of the upper Atkinson/ above, to the shallow-water marine facies, below. The electric log indicates that the change in facies is at 4060 ft. The sample is composed, chiefly, of fragmen.ts of .light-gray, dense, very fine to fine-grained, micaceous sandstone, many fragments of lignite, ani a little shale like the samples .just above. 409_6-4112 ' "{ . ' 1' . ' . Core 16. Recovery'! Part A. Sandstone, clear' quartz; fine-grained, moderately even grained, angular, micaceous, somewhat pyri..tic. . . Part B.. Sandstone, clear quartz, fine ~ to moderately coarse :grained, micaceous; and greenish;gray, flaky,. smooth-textured . shale containing a few fragments of 'ligt:lite. ~ 4112-4124 .' Sandstone,- white,. and a . little olive-green flaky shale like core 16 Itt ., at 4096:4112 ft.; also cavihgsOf shah~ and sandstone from higher levels. of' 4124-4139 :Like sampfe at 4112-4124 ft. with the' addition of a few coarse f ": i. .1 ~ "' < grains.' Clear quartz sand. ' ' 4139-4155 Sand, coarse-grained, 'clear' quartz; and fine~irained, dense, mica- ceous, clear quartz sandstone; gray .and . greenish-gray flaky shale'; many fraginelits of lignite. .. 4155-4171 Core 17. 'Recovery? , Part A. Sandstone, clear quartz, moderately _ fine and even grained, Joosely consolidate'd, micaceous. Part B. Sandstone, hard, dense, moderately fitie grained, some- wnat uneven grained; conglomeratic, containing many fragments ... of carbonaceous material, nodules' of .. gray clay, fragments of greenish-gray shale, quartz pebbles, and nodules of limonit~. . 4171-4188 Shale, gray and green!sh~gray, flaky; also coarse-grained quartz sand; lignite; fragments of the conglomeratic sandstone reported 1 .in core 17 at 4155-4171 ft. 4188-4209 . No ' '(" . . c.hai:f.g.e. ). 4209-4221 ' Core 18. Recovery? Part ' A... Sandstone, light-gray, very hard, dense, fine-grained to silty, .c'ontain!ng n1any highly micaceous lenses, and a few lenses . ,. of gray flaky shale. ' ' Part B. Sandstone, white, lo.osely consolidated, uneven-grained, silty, micaceous. 4227-4242 Shale, gray, flaky; and fragments of white, fine-grained sandstone; a few shell'fragments. ., . <, [ ~- I LOGS OF SELECTED WELLS IN THE COASTAL PLAIN l?F GEORGIA 227 Depth (feet) Description 4242-4253 r Shale, gray, flaky, and many fragments of white, moderately coars~ grained, highly fossiliferou~, calcareous sandstone. 4253-4260 Core 19. Recovery? . : : Part -A. Sand, Clear quartz, fine-grained, even-grained, angular; : .also.fragments of .gray flaky shale; containing many small pieces of carbonaceous material and ,a trace .of mica. ,_,.,. .- Part B. Like part A. , ... J ~- . ' . Part C. . Sand, clear . q~artz, fine. to moderately fine. grained, ,' angular; also many fragments of. carbonaceous material, and a few shell fragments. . Part D'. Sand, clear ' quartz, fine to moderately fine grained; also many fragments of gray, flaky, slightly mic_aceous, car- -' _bonaceous shale .that seem to be embedded in the. sand. 4260-4269 Shale, gray, and fragments of white, hard; highly microfossiliferous, calcareous sandstone; a few: fragments of lignite. 426.9 - 4308 .'~,: . ,; ! .. No change. .:':'i ~ -~ Atkinson Formation. .,~ Lower Member. 4308-4325 . Core 20. Recovery? Part A. Sandstone, .light-gray, dense, fine-grained, micaceous, So!neWhat glauconitic. ' ..~ . . '~l .,,. - . .:., PartB: Lhn"estoil~, light-iiray;.J. vel-y bard, dense, miCrOfossili- ferous; contains a few fragments of carbonaceous material, and is partially dolomitized. Part C. Fragments of limestone' like part A, and many frag- . ments , of greenish-gray, _micaceous ~iltstone, .containing . abun- of a s: ..~ ~.~ ~ : ,' d"&.n-t ;_~Orn and broken shells ot foSSn biv3IveS,J. a few molds of . smali gastropods, a trace . gHiuconite, few 'phosphatic nodules, _ and shreds of carbonaceous material. . :"t . ,.., ,, . I . , ~ ~ai.-t D. Sh8Je, gray, micaceous, containing much carbonaceous ,1 ,, material; fish scales,' many fragments of an Ostrea-like bivalve; and a few lenses of light-gray, sandY' shale in which the sand is very fine g'rained;- . , . 4325-4331;;".1 ,-. Shale, greenish~gray, and white, hard, fossiliferous limestone. 4331-4347 No change. ' ~~ -~ ' :.' 4347~4359 .1 . Like the preceding sainples of Hie lower -Atkinson, but shale frag- ments are relatively more'' abundarit. The microfauna is com- posed of a few Specimens of ostracodes, and a few specimens of 'Ammobaculites agrestis and other species characteristic of the so-called "marine shale" of the Tuscaloosa. 4360-4371 Core 21. Recovery? .Part A. Sandstone, gray, hard, silty to very fine grained, micaceous. !)rt B. Shale, gray, hard, sandy, micaceous, containing niany .. '... : . fragments of Ostrea-like bivalves. 228 GEORGiA GEOLOGICAL SURVEY BULLETIN 74 / Depth (feet) Description Part C. San-d, -clear quartz, fine to coarse-grained, micaceous; .. and many fragments' of light-gray, soft, micaceous, finely car- :. : bonaceous siltstone, Part D. Sand, clear, quartz, fine to coarse-grained and frag- ments of very fine grained, micaceous, somewhat glauconitic sandstone containing worn fragments of Ostrea-like bivalves .-~ - - and a little carbonaceous _material. 4371-4380 ,4380~4389 Sandstone, light-gray, hard, dense, calcareous, containing worn and broken fragments of -microfossils; also cuttings of gray and greenish-gray flaky shale. _ Sandstone, gray, dense, highly micaceous;. and gray and greenishgray shale. 4389-4419 Like sample at 4380-4389 ft.; but shale fragments are dominant. 4419-4437 - Core 22. Recovery? _ Part A.- San-dstone, dark-gray to black-streaked, very fine grain- ed, highly micaceous, argillaceous. <.Eart B. Like part A, and a little loose, coarse-grained sand. Part C. Sand white, loosely consolidated, fine to very coarse grained, micaceous. .,~,:~ Part D. Like part C. . .' 4437-4449- Sand like part C and part ~ of core 22 at 4419-4437 ft. ' 4449-4462 Like sample at 4437-4449 ft. The sand contains a few yellowish- . . ~; '-c green grains. -~~ !f: Comanche Series undifferentiated 4462-4477 Like sample at 4449-4462 ft. Greenish-yellow grains are common in-the sand, which al~o contains many pink grains. 4477-4497 Core 23. R,e_covery? ' . ' Part A. Shale, bard,. mottled, gray; mustard-yellow, purple, and reddish-brown, micaceou's, unctuous; contains small siderite ~~ I _.- spherules. Part B. Like part A; siderite common. J Part C. Like part ,B, a,nd white, fine to coarse-grained, cl!lYcemented, clear quartz sand. Part D.. Clay, JJ1Ulticolored, hard; and fine to coarse-grained .'- sand;. abundan,t siderite spherule-s. ( - t. - .~. . 4497-4506 Like core 22 at 4477-4497 ft., and a few fragments of pink and white, moderately coarse-grained, calcareous sandstone. 4506-4515 Like sample at 4497-4506 ft., ani!- many fragments of pink sandstone . .4515-4529 Sand, fine to very coarse grained, clear quartz, and fragments of multicolored shale. The sand contains many greenish-yellow and pink grains. 4529-4544 Sand, similar to sample at 4515-4529 ft., but is composed mainly D epth (f eet) 4555-4575 4575-4585 4585-4595 4595-4604 4607-4616 229 . Description of white and yellow grains and a little white feldspar; also a little multicolored shale. Core 24. Recovery? Part A. 2 ft. Sandstone, pinkish-white, loosely consolidated, fine to moderately coarse grained, somewhat calcareous, cemented with white bentonitic clay; pink-tinted and greenish-yellow grains are fairly common. Part B. Like part A, but sand is mostly coarse grained. Pre-Cretaceous(?) The top of the pre-Cretaceous (?) rocks is placed at 4570 ft. on the basis of electric log correlation, supported by sample data. Like core 24 at 4555-4575 ft., and also fragm ents of reworked and weathered "basement" rocks. Like sample at 4575-4585 ft., but the reworked and weathered ''basement" material is dominant. Pink and gray arkosic quartzite. Top of black "basement" material; igneous rock?