	Authors	Year	Title
	Clifton	1942	Invertebrate faunas from the Blaine and the Dog Creek Formations of the Permian Leonard Series. Journal of Paleontology, 16 (6): 685-699, pl.101-104; Tulsa,Oklahoma.
	Clifton	1946	Middle Permian Cephalopoda from Texas and New Mexico. Journal of Paleontology, 20 (6): 556-559, pl.85; Tulsa,Oklahoma.