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New Records of Rhinoceroses from the Ringold Formation of Central Washington and the Hemphillian-Blancan Boundary

Fossil specimens of two genera of rhinocerotids are here reported from the late Miocene to early Pliocene Ringold Formation of south-central Washington State. The metacarpal of Aphelops is the farthest northwest record of this Hemphillian rhino, the first authentic record of Aphelops from this state, and the first fossil mammal from the lower part of the Ringold section. An upper molar of Teleoceras is the first rhino specimen recorded from the White Bluffs Local Fauna (early Blancan). The presence of Teleoceras in a clear superpositional relationship above strata containing microtine rodents clarifies the stratigraphic and chronologic sequence of these biostratigraphically critical taxa near the Hemphillian-Blancan boundary and demonstrates their actual chronological overlap.