Niobrara Formation of Upper Missouri
American South USA
Geological Time: Cretaceous Upper Cretaceous Santonian
the SEM image is provided by Dr.
The identification is based upon:
Georgescu, M. D., 2013: New advances in understanding the heterohelicid planktic foraminifer early evolution. Studia UBB Geologia, 2013, 58 (2) page 19 to 28 Plate n.a., Fig. 6.10-11
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