Preliminary collecting and excavating along the South Sulphur River has produced a diverse list of fossil mammals. The pampathere, Holmesina septentrionalis, and the large armadillo, Dasypus bellus, with their southern affinities from the extinct megafauna, were found in association with Microtus pennsylvanicus, which has a northern distribution at present. This combination of species argues for climatic conditions and biotic communities during the Pleistocene that have no modern counterparts.
Davis, Leo Carson and Ball, Kenneth M.
"Pleistocene Mammals from the South Sulphur River, Hunt County, Texas,"
Journal of the Arkansas Academy of Science: Vol. 45
, Article 7.
Available at: http://scholarworks.uark.edu/jaas/vol45/iss1/7