	Authors	Year	Title
	Girty	1911	The fauna of the Moorefield Shale of Arkansas. Bulletin, U.S. Geological Survey, 439: 1-148, pl.1-15; 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].