Meniscotherium Phenacodontidae Phenacodus Orthaspidotherium Las Tetas de Cabra Formation San Jose Formation Protictis Sparnotheriodontidae Condylarthra Green River Formation List of the Cenozoic life of Wyoming Ocepeia Wasatch Formation List of the prehistoric life of New Mexico List of the prehistoric life of Colorado List of the prehistoric life of California List of the prehistoric life of Wyoming Evolution of the horse List of the Cenozoic life of California List of the Cenozoic life of Colorado Eutheria List of prehistoric mammals Azilestes Zhelestidae Willwood Formation