Authors Year Title
Fenton & Fenton 1924 The stratigraphy and fauna of the Hackberry stage of Upper Devonian.
Contributions of the Michigan University, Museum of Geology, 1: 1-260, fig.1-9,pl.1-45; New York.
Miller 1936a Iowa Devonian ammonoids.
Proceedings of the Iowa Academy of Science, 43: 231-234, pl.1; Iowa City.
Miller 1936b Devonic Ammonoids of Iowa.
Pan-Amer. Geologist, 65: 336-338; Des Moines.
Miller 1938 Devonian ammonoids of America.
Special Papers, Geological Society of America, 14: 1-262, fig.1-41, pl.1-39; Baltimore.