Other finds of Colognathus were from places such as the Palo Duro Canyon (in western Texas) and the Santa Rosa Formation (in New Mexico).
The range of this species extends from southern Oregon and Wyoming in the north, and extends south to roughly the U.S.-Mexico border, with a disjunct population designated as Peromyscus truei comanche which occupies an area in the vicinity of Palo Duro Canyon in the Texas panhandle.
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