original description
White, C.A. (1879). Report on the paleontological field-work for the season of 1877. <em>United States Geological and Geographical Survey of the Territories, annual report (for 1877).</em> 11: 161-272., available online at https://www.biodiversitylibrary.org/page/30820140
page(s): 170 (footnote) [details]
From editor or global species database
Type locality Almy coal-mines, near Evanston, Wyoming, and Crow Creek ("No. 5 of the Crow Creek section"), Colorado, United States; Evanston Formation, Campanian to Selandian, late Cretaceous to middle Paleocene, and Laramie Formation, Maastrichtian, late Cretaceous [details]