Missouri River Basin
American South USA
Geological Time: Cretaceous Upper Cretaceous Santonian
the SEM image is provided by Dr.
View of a specimen of Laeviheterohelix euryconus (Ehrenberg, 1854)
The identification is based upon:
Georgescu, M. D., 2013: Revised evolutionary systematics of the
Cretaceous planktic foraminifera described by C.G. Ehrenberg micropaleontology, vol. 59, no. 1. pages 1-49. Plate 3, Fig. 5-7
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