Ground squirrel List of the Cenozoic life of Nevada List of the Cenozoic life of Nebraska List of the Cenozoic life of Oregon List of the Cenozoic life of South Dakota 2013 in paleomammalogy List of the Cenozoic life of Texas List of the Cenozoic life of Wyoming List of the Cenozoic life of California List of the Cenozoic life of Colorado List of the Cenozoic life of Florida Dove Spring Formation Ash Hollow Formation 2020 in paleomammalogy