Dawn of the Age of Mammals in the Northern Part of the Rocky by Thomas M. Bown, Kenneth D. Rose

By Thomas M. Bown, Kenneth D. Rose

Mammals within the Rocky Mountains

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Dalrymple, G. , 1979, Critical tables for the conversion of K-Ar ages from old to new constants: Geology, v. 7, p. 558-560. Decourten, F. , 1978, Non-marine flora and fauna from the Kaiparowits Formation (Upper Cretaceous) of the Paria River Amphitheater, southwestern Utah: Geological Society of America Abstracts with Programs, v. 10, p. 102. Dickinson, R. S. Geological Survey Geological Quadrangle Map GQ-486, scale 1:24,000. Dickinson, R. , Leopold, E. , and Marvin, R. , 1968, Late Cretaceous uplift and volcanism on the north flank of the San Juan Mountains, Colorado, in Epis, R.

125-148. , 1971, Sedimentology and taphonomy of the Oldman Formation (Campanian), Dinosaur Provincial Park, Alberta (Canada): Palaeogeography, Palaeoclimatology, Palaeoecology, v. 10, p. 21-74. Doelling, H. , 1972a, Alton coal field, in Doelling, H. H„ and Graham, R. , Southwestern Utah coal fields; Alton, Kaiparowits Plateau and KolobHarmony: Salt Lake City, Utah Geological and Mineralogical Survey Monograph Series 1, p. 1-66. , 1972b, Kolob-Harmony coal fields, in Doelling, H. , and Graham, R.

This assemblage consists of three localities, which according to the authors, could be placed in the ascending biostratigraphic order of Bug Creek Anthills, Bug Creek West, and Harbicht Hill. These authors recognized that the sites occurred in channel-fill deposits with the localities recorded as being 24,18, and 12 m, respectively, below the base of the Hell Creek-Tullock formational boundary. This formational contact was also taken to be the Cretaceous-Tertiary boundary. Thus, the conclusion was that the Bug Creek faunal assemblage represented successive, fossil-bearing channels capped within the Cretaceous Hell Creek Formation.

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