UC Berkeley

With few notable exceptions, mammalian faunas from the latest Paleocene of North America (Clarkforkian North American Land Mammal Age, approximately 57 to 55.7 Ma) are poorly known, with the vast majority recovered from a single area, the Bighorn Basin of northwestern Wyoming. Comparably aged faunas elsewhere are few. Here we describe new material, including several previously undocumented species, from the Buckman Hollow local fauna from the Green River Basin of southwestern Wyoming. Newly documented occurrences include the multituberculate Neoliotomus conventus, the oxyaenid creodont Dipsalidictis, and a rare phenacodontid condylarth Ectocion cf. E. major. Although sparse, these additions offer the opportunity to reevaluate biostratigraphic and biogeographic patterns observed among latest Paleocene faunas, which include differing mammalian co-occurrence patterns in these more southerly faunas than seen in the Bighorn Basin. © Society for Vertebrate Paleontology April 2014.