	Authors	Year	Title
	Meek & Worthen	1866	Description of invertebrates from the Carboniferous system. Geological Survey of Illinois, vol.2, Paleontology: 143-423, pl.14-25; Springfield.
	Smith	1903	The Carboniferous Ammonoids of America. Monography, U.S. geological Survey, 42: 1-211, pl.1-29; Washington.