Geological Time: Cretaceous Lower Cretaceous
image from Leckie, M. (1984). Mid-Cretaceous planktonic foraminiferal biostratigraphy off Central Morocco, DSDP Report
The identification is based upon:
, : Tappan, H. (1940). Foraminifera from the Grayson Formation of northern Texas. Journal of Paleontology. 14: 93-126. Plate , Fig.
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