	Authors	Year	Title
	Gordon	1986	Late Kinderhookian (Early Mississippian) Ammonoids of the Western United States. Journal of Paleontology, Mem. 19: 1-36, fig.1-12, tab.1-6; Tulsa, Okla.
	Matthews	1970	A new cephalopod fauna from the Lower Carboniferous of east Cornwall. Palaeontology, 13 (1): 112-131, fig.1-6, pl.25-28; London.