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Mammals from the earliest Uintan (middle Eocene) Turtle Bluff Member, Bridger Formation, southwestern Wyoming, USA, Part 2: Apatotheria, Lipotyphla, Carnivoramorpha, Condylartha, Dinocerata, Perissodactyla and Artiodactyla. https://doi.org/10.26879/720 palaeo-electronica.org/content/2017/1844-bridger-turtle-bluff-member-mammals Copyright: © June 2017 Society of Vertebrate Paleontology. Paleontology and geology of the Bridger Formation, southern Green River Basin, southwestern Wyoming, Part 2, the Bridgerian insectivore Entomolestes grangeri. All specimens are curated in the research collections at the Department of Paleontology at the San Diego Museum of Natural History, the Paleontology Section of the Museum of Natural History, University of Colorado, and the Department of Earth Sciences, Denver Museum of Nature and Science. The paracone is slightly larger than the metacone and positioned slightly more labially. The protocone is large and positioned anteriorly, below the paracone apex. The smaller sized group of teeth (Figure 2.1-6) are well within the observed ranges of those of Apatemys bellulus and are referred to the species. Although both groups exhibit similar occlusal morphology, the A. Middle Tertiary marsupials (Mammalia) from North America. A greater understanding of the faunal composition of the TBM allows a better characterization of the beginning of the Uintan and further clarifies the Bridgerian-Uintan transition. One of us (Murphey) has conducted over 15 years of field work in the TBM, including quarrying and screen washing of large amounts of matrix followed by heavy liquid separation of the fossils from the concentrates, which has resulted in a diverse sample of mammals from six localities in the TBM (Figure 1).

The postmetacrista extends posteriorly from the metacone apex to terminate at an indistinct metastyle at the posterolabial corner of the stylar shelf. The M3 is transversely expanded, that is its length is significantly narrower than its width.

The TBM overlies the Twin Buttes Member of the Bridger Formation, upon which the Twinbuttean Subage or biochron Br3 of the Bridgerian North American Land Mammal age is characterized. The third paper will document the marsupials from the TBM and provide a reevaluation of the Bridgerian-Uintan North American Land Mammal age transition based faunal comparisons along with new radioisometric and paleomagnetic data for the TBM.

For over a century, the TBM yielded only a few fragmentary specimens, but extensive field work over the last 23 years has resulted in the discovery of numerous mammal fossils from the member, which provides an unprecedented opportunity to better define this poorly known interval. Measurements of small mammal teeth were made with an optical micrometer to the nearest 0.01 mm, and those of large mammals were made with calipers to the nearest 0.1 mm.

This excessive taxonomic lumping also resulted in extreme dental size ranges with high coefficients of variation for A. Most recent investigators have not accepted most of West's (1973b) synonymies (e.g., Gazin, 1976; Gunnell and Bartels, 1999; Koenigswald et al., 2005; Gunnell et al., 2008a; Silcox et al., 2010) and recognize the three originally described species from the Bridger Formation.

The Apatemys specimens from the TBM at UCM Locality 92189 are represented by two distinct dental size groups.

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