Locality L1151, Garfield County, Montana, United States; Hell Creek Formation, Maastrichtian, late Cretaceous [details]
Locality L0049, Fallon County, Montana, United States; Fort Union Formation (Ludlow Member [Williston Basin]), Paleocene [details]
Locality L6460, McCone County, Montana, United States; Fort Union Formation (Ludlow Member [Williston Basin]), Paleocene [details]