Neodon List of the prehistoric life of West Virginia Microtus henseli List of the Cenozoic life of Kansas List of the Cenozoic life of Nevada List of the Cenozoic life of Utah List of the Cenozoic life of South Dakota Arvicolinae List of the Cenozoic life of Texas List of the Cenozoic life of Nebraska List of earliest tools List of the Cenozoic life of Colorado 2012 in paleomammalogy