original description
Meek, F. B.; Hayden, F. V. (1857). Descriptions of new genera of fossils, collected by Dr. F.V. Hayden, in Nebraska territory, under the direction of Lieut. G.K. Warren, US Topographical Engineer; with some remarks on the Tertiary and Cretaceous formations of the north-west, and parallelism of the latter with those of other portions of the United States and Territories. <em>Proceedings of the Academy of Natural Sciences of Philadelphia.</em> 9: 117–148., available online at https://www.biodiversitylibrary.org/page/6330383
page(s): 135-136 [details]
From editor or global species database
Type locality Judith River mouth ("Bed C of the section of freshwater and estuary deposits at mouth of Judith River"), Fergus County, Montana, United States; Judith River Formation, Campanian, late Cretaceous [details]