A new mammal track from the Laramie Formation (Maastrichtian) at the Fossil Trace locality,Golden, Colorado |
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| Institution: | 1. Dinosaur Trackers Research Group, University of Colorado at Denver, CO 80217, United States;2. Peace Region Palaeontology Research Centre, P.O. Box 1540, Tumbler Ridge, British Columbia V0C 2W0, Canada;3. Museum of Moab, 118 East Center St., Moab, UT 84532, United States;4. Utah Geological Survey, P.O. Box 146100, Salt Lake City, UT 84114, United States;1. INCITAP (CONICET and Universidad Nacional de La Pampa), Av. Uruguay 151, 6300 Santa Rosa, La Pampa, Argentina;2. Universidad Nacional de La Pampa, Facultad de Ciencias Exactas y Naturales, Av. Uruguay 151, 6300 Santa Rosa, La Pampa, Argentina;1. Department of Geology, Faculty of Sciences, University of Zanjan, Zanjan 45371-38791, Iran;2. New Mexico Museum of Natural History and Science, 1801 Mountain Road N.W., Albuquerque, NM 87104-1375, USA;3. Department of Vertebrate Paleontology, National Museum of Natural History of Iran, Department of Environment, Pardisan, Hemmat Highway, Tehran, Iran |
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| Abstract: | A previously unknown and morphologically distinct pentadactyl mammal track was recovered from the Upper Cretaceous (Maastrichtian) Laramie Formation at the Fossil Trace site, a National Natural Landmark which is the type locality for Schadipes crypticus, the only named mammal track known from North America. The track is different, and larger than S. crypticus, and thus is evidence of a diversity of mammal trackmakers at this site. Although Cretaceous mammal tracks are very rare, preliminary indications are that those currently known are all morphologically distinct and therefore indicative of a global diversity of different trackmakers, as the body fossil record suggests. Lack of well-preserved mammal trackways with morphologically distinct manus and pes footprints hampers efforts to name diagnostic ichnotaxa. |
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| Keywords: | Cretaceous Maastrichtian Mammals Footprints |
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