	Authors	Year	Title
	Smith	1903	The Carboniferous Ammonoids of America. Monography, U.S. geological Survey, 42: 1-211, pl.1-29; Washington.
	Work & Mason	2004	Mississippian (late Osagean) ammonoids from the New Providence Shale Member of the Borden Formation, north-central Kentucky. Journal of Paleontology, 78 (6), 1128-1137, 9 fig., Lawrence, KS.