	Authors	Year	Title
	Girty	1908	The Guadalupian Fauna. Professional Papers, U.S. Geological Survey, 58: 1-651, pl.1-31; Washington.
	Miller & Furnish	1940c	Permian ammonoids of the Guadalupe Mountain Region and adjacent areas. Special Papers of the Geological Society of America, 26: 1-242, fig.1-59, pl.1-44; Baltimore.