Authors	Year	Title
Becker & House	1993	New early Upper Devonian (Frasnian) goniatite genera and the evolution of the "Gephurocerataceae". Berliner geowissenschaftliche Abhandlungen (E), 9: 111-133, fig.1-4, pl.1-2; Berlin.
House	1962	Observations on the ammonoid succesion of the North American Devonian. Journal of Paleontology, 36: 247-284, fig.1-15, tab.1-3, pl.43-48; Tulsa, Okla.
Miller	1938	Devonian ammonoids of America. Special Papers, Geological Society of America, 14: 1-262, fig.1-41, pl.1-39; Baltimore.