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Mandible of Chiromyoides minor (Mammalia, Primates) from the Upper Paleocene Chappo Member of the Wasatch Formation, Wyoming

Philip D. Gingerich and John A. Dorr, Jr.
Journal of Paleontology
Vol. 53, No. 3 (May, 1979), pp. 550-552
Stable URL: http://www.jstor.org/stable/1303995
Page Count: 3
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Mandible of Chiromyoides minor (Mammalia, Primates) from the Upper Paleocene Chappo Member of the Wasatch Formation, Wyoming
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Abstract

A small collection of mammalian fossils was made in 1977 at the type locality of the Chappo Member of the Wasatch Formation in the Green River Basin near La Barge, Wyoming. The new collection includes the first mandible of the primate Chiromyoides with cheek teeth to be described from North America. The specimen, which comes from near the base of the type section of the Chappo Member, is an important topotype of the species C. minor. Restudy of the mammalian fauna from the type locality indicates that the Chappo Member is, at least in part, mid-Tiffanian (middle Late Paleocene) in age, not Clarkforkian, and thus it is older than previously reported.

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