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Eiffellithus keio Shamrock in Shamrock & Watkins, 2009
Shamrock, J. L. & Watkins, D. K. 2009. Evolution of the Cretaceous calcareous nannofossil genus Eiffellithus and its biostratigraphic significance. Cretaceous Research. 30(5): 1083-1102.
Eiffellithus keio
Shamrock in Shamrock & Watkins, 2009
Early Turonian
Hartland Mbr, Greenhorn Limestone Fm,, Washington County, Kansas
