Note on a hyaenarctid bear from the Middle Pliocene of Chihuahua, Mexico

Abstract

The continental deposits exposed along the margins of the Valley of the Rio Papigochic, western Chihuahua, Mexico, have yielded a large and varied mammalian fauna of the Hemphillian stage of the Pliocene. Elements of the fossil assemblage have been described, and an extended report by Dr. John F. Lance on the fossil horses of the region is now in press. At least two locality names have been applied to the Chihuahuan middle Pliocene occurrences. Rincon was the first designation and was replaced subsequently by Yepomera, a more desirable place name for this faunal horizon, particularly because Rincon had been used for a stratigraphic formation or member. From the Yepomera Pliocene is now recorded a hyaenarctid bear.

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