Hyaenognathus from the Late Pliocene of the Coso Mountains, California

Abstract

Of the several occurrences of Hyaenognathus in the Pliocene and Pleistocene of North America three are recorded from California, one from the valley of Mexico, and one from Nebraska. To this list is now added a fourth occurrence in California based on a specimen from late Pliocene beds, exposed on the western flanks of the Coso Mountains, Inyo County, California. While relatively few mammalian forms are now known from these deposits the fauna includes, in addition to Hyaenognathus, a new type of vole (Cosomys Wilson), a mastodon, Plesippus or Pliohippus, and a peccary.

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