in thickness from 60 to 700 feet, also occurs in 

 three oppositional facies as follows: 



1. Dark-gray to greenish-gray flaky shale and 

 dark brownish-gray-to black splintery shale com- 

 monly containing thin lenticular beds of sandstone 

 that may be glauconitic and fossiliferous and rep- 

 resents a marine facies. 



2. Poorly sorted micaceous sandstone interbed- 

 ded with varicolored sideritic shale that repre- 

 sents a littoral facies. 



3. Dark-gray to black micaceous and arenace- 

 ous shale and fine-grained sandstone that repre- 

 sents a marine facies. 



The collection of Ostracoda submitted by the 

 Applins included specimens designated as "middle 

 and lower Atkinson" undifferentiated. 



This terminology of former (1947) usage is 

 here remanded to the terminology of current 

 (1955) usage and specimens labeled "middle and 

 lower Atkinson" are recorded in this paper as oc- 

 curring in the lower member of the Atkinson For- 

 mation as redefined (Applin, 1955, p. 187). 



The following Ostracoda were obtained from 

 the lower member of the Atkinson Formation: 

 Cytherella beyrichoicles Swain and Brown, n. sp., 

 Cytherella austineyisis Alexander, Bairdia coman- 

 chensis Alexander, Bairdia ? sp., Paracypris 

 goodlandensis Howe and Laurencich, Paracypris 

 alta Alexander, Paracypris sp., Paracyprideis ? 

 graysonensis (Alexander), Schideridea washi- 

 taensis (Alexander), Cythereis eagle f or densis 

 Alexander, Cythereis sp., Cythereis fredericks- 

 burgoides Swain and Brown, n. sp., Alatacythere 

 tokiana ? (Israelsky), Eocytheropteron cf. tumi- 

 dum (Alexander), Eocytheropteron semicon- 

 strictum ? Alexander, Centrocythere annulopapil- 

 lata Swain and Brown, n. sp., and Cytherelloidea 

 ontovariosa Swain and Brown, n. sp. 



Wells from which Atkinson Ostracoda were 

 submitted are located in Figure 2 and include the 

 following: 



Alabama 



1. Union Producing Company's No. 1 Kirkland 

 well; NE NE sec. 20, T. 7N., R. 11W., Houston Coun- 

 ty, Alabama; drill-cutting sample 3,709-3,711 feet. 



2. Escambia Oil Company's No. 1 State Line Land 

 and Lumber Company well ; 375 feet S and 330 feet W 

 NE cor. NW SW, sec. 24, T. IN., R. 10E., Escambia 

 County, Alabama; core sample 4,679-4,684 feet. 



Florida 



3. Sun Oil Company's No. 1 Tillis well, SE SW, 

 sec. 28, T. 28., R. 15E., Suwannee County, Florida; 

 core sample 3,240-3,250 feet. 



4. Sun Oil Company's No. 1 Westbury well; 14, 

 789.09 feet S and 4,927.42 feet E, NW cor, sec. 37, T. 

 IIS., R. 26E., Putnam County, Florida; core sample 

 3,834-3,838 feet. 



5. Humble Oil Company's No. 1 Tindel well, C NW 

 NE, sec. 8, T. 5N., R. 11W., Jackson County, Florida; 

 core samples 2,881-2,891 feet and 3,470-3,500 feet. 



6. Sun Oil Company's No. 1 Johnson well; SE SE 

 NE, sec. 27, T. 4S., R. 16E., Columbia County, Florida; 

 core sample 2,955-2,965 feet. 



7. Sun Oil Company's No. 1 Russell well; SW NE 

 NE, sec. 8, T. 5S., R. 15E, Suwannee County, Florida; 

 core sample 3,070-3,080 feet. 



8. Humble Oil Company's No. 1 Cone well, SE NW 

 sec. 22, T. IN., R. 17E., Columbia County, Florida; 

 core sample 3,548-3,556 feet. 



9. Coastal Petroleum Company's No. 1 Larsh well; 

 SW NE SW, sec. 1, T. 2S., R. 3E., Jefferson County, 

 Florida; core sample 3,445-3,451 feet. 



10. Coastal Petroleum Company's No. 1 Wright 

 well; SE cor. sec. 7, T. 30S., R. 17 E., Pinellas County, 

 Florida; core sample 7,100-7,107 feet. 



11. Sun Oil Company's No. 1 P. C. Crapps "A" 

 well; NW NE, sec. 36, T. 8S., R. 10E., Dixie County, 

 Florida; core sample 3,548-3,556 feet. 



12. Magnolia Petroleum Company's No. 5B State 

 Block 1A well; Offshore Blk. 5B, 15,009.9 feet S, 

 43°52'5" W of USC&G Triangulation Station Sand 2, 

 1935, on shore of mainland near SW cor. sec. 6, T. 

 9S., R. 8W., and 9,559 feet S, 21°41'45" E of USC&G 

 Triangulation Station Hoppe .2, 1935 on shore of 

 mainland approximately V2 mile E of SW cor. of 

 fractional sec. 10, T. 9S., R. 9W., Franklin County, 

 Florida; core sample 5,138-5,144 feet. 



Georgia 



13. Sun Oil Company's No. 1 Barlow well, SW NE 

 SW, Lot 373, 12th. Land District, Clinch County, 

 Georgia; core sample 3,709-3,711 feet. 



14. Humble Oil and Refining Company's No. 1 Ben- 

 nett and Langdale well, 660 feet S and 660 feet E of 

 NW cor. Land Lot No. 146, 12th. Land District, 

 Echols County, Georgia; core samples 3,690-3,700 

 feet and 3,700-3,710 feet. 



The occurrence of species in individual wells is 

 given in table 3. 



