° %, o £ 02 



O O 



: s .- s 



Ostracoda 



gd, gd, Mm Wco Km Wen Wfc 



Clithrocytheridea halifaxensis Swain and Brown, n. sp. 

 Cythereis pittensis Swain and Brown, n. sp. 

 Cythereis sp. aff. C. glabrella Triebel 

 Dolocytheridca? caledonensis Swain and Brown, n. sp. 

 Eocytheropteron greenvillensis Swain and Brown, n. sp. 

 E ocytheropteron venoides Swain and Brown, n. sp. 

 Eucythcre semiglypta Swain arid Brown, n. sp. 

 Eucytheroides pustulosa (Swain) 



Fossocytheridea lenoirensis Swain and Brown, n. sp. 

 Haplocythcridea multiclefta Swain and Brown, n. sp. 

 Orthonotacythere delicatula Swain and Brown, n. sp. 

 Perissocytheridea odomensis Swain and Brown, n. sp. 

















X 



X 



X 



X 



X 



X 



X 





X 



X 











X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 



X 







X 













X 







X 











X 





Table 2. — Occurrence of Ostracoda in North Carolina wells discussed in this report. 



Ostracoda from the Atkinson Formation 



The subsurface Atkinson Formation of south- 

 ern Alabama, northern Florida, and Georgia was 

 named and described by Applin and Applin (1947) 

 to include those sediments lying between beds of 

 basal Austin age, above, and beds of Early Creta- 

 ceous age (undifferentiated), below. Three mem- 

 bers comprised the Atkinson Formation and were 

 designated lower member, middle member, and 

 upper member, respectively. In 1955, the Atkin- 

 son Formation was redefined (Applin, p. 187) to 

 include just two members, the lower member and 

 the upper member, respectively. The lower mem- 

 ber included the lower and middle member of for- 

 mer (1947) usage, and was correlated with the 

 Woodbine of Texas. The upper member remained 

 the upper member of former • (1947) usage and 

 was correlated with the Eagle Ford of Texas. In 

 general, the Atkinson Formation is equivalent to 

 the Tuscaloosa Formation and, in part, to the 

 overlying lower part of the Eutaw (restricted). 



Specific details concerning correlation of the 

 Atkinson Formation with sedimentary units in 



other areas are given in Applin and Applin (1947), 

 Applin (1955), and Murray (1961). 



The upper member of the Atkinson Formation, 

 that contains a fauna of Eagle Ford age and 

 ranges in thickness from 500 to 1,000 feet, occurs 

 in three depositional facies as follows: 



1. Unfossiliferous red shales and poorly sorted 

 gravels of littoral or non-marine origin. 



2. Sand and minor shale, greenish gray in col- 

 or, that contains mollusk fragments and probably 

 is of shallow water marine origin. 



3. Flaky shale, dark green in color, and fine- 

 grained sandstone containing mollusks and an 

 Eagle Ford microfauna that represents an off- 

 shore marine environment. 



The following Ostracoda were obtained from 

 the upper member of the Atkinson Formation: 

 Cytherella tuberculifera Alexander, Haplocyther- 

 idea lunarea Swain and Brown, n. sp., Brachy- 

 cythere nausiformis Swain, and Cythereis quadri- 

 alira Swain. 



The lower member of the Atkinson Formation, 

 that contains a fauna of Woodbine age and ranges 



