	Authors	Year	Title
	Girty	1909	The fauna of the Caney Shale of Oklahoma. Bulletin, U.S. Geological Survey, 377: 1-106, pl.1-13; Washington.
	Gordon	1965	Carboniferous Cephalopods of Arkansas. Professional Papers, U.S. Geological Survey, 460: 1-322, fig.1-96, pl.1-32; Washington. [imprint 1964].