Discrimination between members of these two genera is difficult or impossible on many of the elements available as fossils. At the same time, many of the elements are easily distinguished from Thomomys, the other genus occurring in our region during the Wisconsin.
Mid Wisconsin: Papago Springs Cave (Czaplewski and Mead et al. 1999: cf.).
Late Wisconsin: Dust Cave (Harris and Hearst 2012).
Literature. Czaplewski and Mead et al. 1999; Harris and Hearst 2012.
Last Update: 23 Jan 2013