|Type material from Macdonald 1963|
Warm forests are not the typical scene for the Rocky Mountains, but during the time of Ekgmowechashala the mountains of western North America were warmer than they are now. The teeth leading to this inference make up a large majority of the fossil material that has been recovered. Teeth have been recovered from the 1960's to the present day from Shannon Count, South Dakota (type material), Pine Ridge and Oglala Sioux reservations in South Dakota, Oregon, Nebraska, and Texas. Ekgmowechashala zancanellai material comes from Oregon exclusively at the moment whereas the type species consists of material from the remaining localities.