Denton County, Texas
American South USA
Geological Time: Cretaceous Upper Cretaceous Cenomanian
the SEM image is provided by Dr.
View of a specimen of Guembelitriella graysonensis (Tappan, 1940)
The identification is based upon:
Georgescu, M. D., 2009: On the origins of Superfamily Heterohelicacea Cushman, 1927 and the polyphyletic nature of planktic foraminifera. Revista Española de Micropaleontología, 41 (1-2). page 107-144. Plate 2, Fig. 1
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