Remarks on the Lower Cretaceous beds of Kansas and Nebraska, together with descriptions of some new species of Carboniferous fossils from the valley of Kansas Riverv. 10Academy of Natural Sciences256–264
Meek, F. B. and Hayden, F. V. 1858. "Remarks on the Lower Cretaceous beds of Kansas and Nebraska, together with descriptions of some new species of Carboniferous fossils from the valley of Kansas River." Proceedings of the Academy of Natural Sciences of Philadelphia, 10 256–264.