	Authors	Year	Title
	Mather	1915	The fauna of the Morrow group of Arkansas and Oklahoma. Bull. Denison Univ. Sci. Lab., 18 (3): 59-284, pl.1-16;
	Miller & Moore	1938	Cephalopods from the Carboniferous Morrow Group of Northern Arkansas and Oklahoma. Journal of Paleontology, 12 (4): 341-374, fig.1-4, pl.43,44; Tulsa, Oklahoma.