Eiffellithus casulus 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 casulus
Shamrock in Shamrock & Watkins, 2009
Late Cenomanian
Hartland Mbr, Greenhorn Limestone Fm,, Washington County, Kansas