Sciuromorpha Hart Mine Formation List of the Cenozoic life of Nevada List of the Cenozoic life of Utah List of the Cenozoic life of North Dakota Wasatch Formation List of the Cenozoic life of Wyoming List of the Cenozoic life of Colorado List of the Cenozoic life of California Sheep Pass Formation 2019 in paleomammalogy Bridger Formation 2018 in paleomammalogy