Youghall Formation (CO,UT)
Pennsylvanian
Exposures on west side of Hell's Canyon, in sec. 31, T. 6 N., R. 102 W., and along east side of head of Hell's Canyon in W/2 sec. 7, T. 5 N., R. 102 W., Moffat Co., CO (Thompson, 1945).
Green River basin
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