Heptodon Tapiroidea Fossil Butte National Monument Homogalax Driftwood Canyon Provincial Park List of the prehistoric life of Colorado Wasatch Formation List of the prehistoric life of New Mexico List of the Cenozoic life of Wyoming List of the prehistoric life of Wyoming Ungulate List of the Cenozoic life of Colorado Helaletidae Willwood Formation Paleofauna of the Eocene Okanagan Highlands