148 LEWIS G. WESTGATE AND E. B. BRANSON 
Mountain reaches it at about 7,500 feet. The summit of Oregon 
Buttes, fifteen miles south of Atlantic City may be a remnant of 
the same plain. They are capped with Tertiary deposits. 
This plain was not correlated with any plain-remnants along 
the range to the north, nor with any valley levels within the range. 
At the time of its formation, all of the region was reduced to a 
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Fic. 3.—Map of the south end of the Wind River mountains, based on a map of 
Fremont County by N. H. Brown. 
peneplain, except the Wind River Range, which rose, at the south, 
4,000 feet above the plain level. The date of this plain is post- 
Oligocene, since it cuts rocks of this date along the Beaver Divide. 
Plain No. 3. The Beaver Divide Plain.—Below No. 4 another 
plain (Figs. 3, 4, and 6) is widely developed about the south end 
of the Wind River Mountains, and to the east along the divide 
