This mentioned taxonomy is an attempt to make an conclusive assignment from the different classifications of various scientists. Because the taxonomy may change due to the latest investigative methods and other findings, our map is a guide only.
J. Alroy, 2002 - Synonymies and reidentifications of North American fossil mammals - (), - (unpublished, English)
G. E. Schultz, 1990 - Stop 8: Biostratigraphy and volcanic ash deposits of the Tule Formation, Briscoe County, Texas - Tertiary and Quaternary stratigraphy and vertebrate paleontology of parts of northwestern Texas and eastern New Mexico; Guidebook - Bureau of Economic Geology, University of Texas at Austin (), 60-64 (guidebook, English)
B. Kurten, 1980 - - Pleistocene mammals of North America (), 1-442 (book, English)
E. L. Troxell, 1915 - A fossil ruminant from Rock Creek, Texas, Preptoceras mayfieldi sp. nov. - American Journal of Science (40), 479-482 (journal article, English)