For some years there has been a question regarding the placement of the Permian-Triassic boundary along the southern edge of the Uinta Mountains in Utah and in northwest Colorado. Where carbonate beds of Permian age in the upper part of the Franson member of the Park City formation are thin or absent in the western Uinta Mountains, redbeds of the Mackentire tongue (Permian) of the Woodside formation as used by Thomas (1939) can not be mapped separately from the overlying redbeds of Triassic age in the Woodside formation, an interpretation first suggested by Thomas and Krueger (1956, pp. 1265-67). Cheney...
Permian Outcrops in Western Duchesne County, Utah: GEOLOGICAL NOTES1
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E. L. Yochelson, T. M. Cheney, Dianne Van Sickle, D. H. Dunkle; Permian Outcrops in Western Duchesne County, Utah: GEOLOGICAL NOTES. AAPG Bulletin 1961;; 45 (1): 107–108. doi: https://doi.org/10.1306/0BDA628D-16BD-11D7-8645000102C1865D
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