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New Pleistocene Formation and Local Fauna from Hardeman County, Texas

Walter W. Dalquest
Journal of Paleontology
Vol. 39, No. 1 (Jan., 1965), pp. 63-79
Stable URL: http://www.jstor.org/stable/1301808
Page Count: 17
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New Pleistocene Formation and Local Fauna from Hardeman County, Texas
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Abstract

Pleistocene mammal fossils were discovered near Groesbeck Creek, at the base of the Texas Panhandle, by W. F. Cummins in 1891. The site has since been considered an outcrop of the Seymour Formation, and of Kansan (middle Pleistocene) age. Detailed study shows the deposits to be sediments of Late Wisconsin age that accumulated in a basin formed by solution of gypsum from the underlying Blain Formation, of the Lower Permian. The deposits are named the Groesbeck Formation. Fossils of 40 species of mammals were recovered from the clay, sand and gravel, in addition to the remains of many species of mollusks, fishes, amphibians, reptiles, and birds. Carbon 14 determinations date the fauna 16,775±565 years before present, correlating with the Brady interstadial event. The fauna indicates a moderately cool climate, but absence of extreme cold or long periods of subfreezing temperatures. It is concluded that cold fronts did not extend to Texas during this part of the Pleistocene.

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