Abstract

A new earliest Tiffanian mammalian fauna has recently been discovered in the Fort Union Formation of Bangtail Plateau on the southeastern flank of the Bridger Range in southern Montana. Fossil vertebrates at the Bangtail locality are found in calcareous nodules. Well preserved dental and, in some instances, cranial and postcranial remains of nine mammalian species have been recovered to date. Included are representatives of the orders Multituberculata, Proteutheria, Lipotyphla, and Primates. The Bangtail fauna is one of the few earliest Tiffanian mammalian faunas known, and it is the first well dated fauna from the Fort Union Formation in the western part of the Crazy Mountain Basin.--Journal abstract.

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