	Authors	Year	Title
	Smith	1903	The Carboniferous Ammonoids of America. Monography, U.S. geological Survey, 42: 1-211, pl.1-29; Washington.
	Youngquist	1949b	The cephalopod fauna of the White Pine Shale of Nevada: Supplement. Journal of Paleontology, 23: 613-616, fig.1, pl.100; Tulsa, Okla.