American South USA
North Central Texas, Dallas-Fort Worth area
Lower Eagle Ford Group, lower Britton FM, Turner
Geological Time: Cretaceous Upper Cretaceous Cenomanian
Britton Formation
View of a specimen of Protoheterohelix washitensis (Tappan, 1940)
The identification is based upon:
Caron, Michele, 1985: Cretaceous planktic foraminifera Bolli et al., 1985: Plankton Stratigraphy Cambridge University Press 599 pp. Plate 24, Fig. 6-7