146 LEWIS G. WESTGATE AND E. B. BRANSON 
remnants now stands about 12,500 feet above sea- 
level. Looking north from Wind River Peak 
(Fig. 1) we see the sky line to be composed of 
rounded summits dropping to the east in an even 
g line, but with occasional points rising sharply 
e above this line. Further north, north and east of 
E Fremont Peak and showing on the Fremont Peak 
& quadrangle, extensive flat or gently rounded areas 
{ € occur at heights of over 12,000 feet. Such are, the 
3 H flat east of Indian Pass (Fig. 2, F), Horse Ridge, 
ey = Goat Flat, the flat along the divide at the north end 
ie of the range, and several smaller flats west of the 
crest. The first two are not strictly level, but roll- 
ing, grassed, and rounded upland areas, their higher 
points rising somewhat above the general flat level. 
The whole range was not reduced to the pene- 
plain level. Fremont Peak and the higher points 
north along the range seem to rise distinctly above 
the general summit level, and the rate of rise of 
the ridges or flats which have been named would 
not carry them to the summit by several hundred 
feet. We may picture the condition at the close 
of this epoch as a plain rising along what is now 
the crest of the range to low rounded hills a few 
hundred feet in height. 
This peneplain is not recognized in the southern 
part of the range, probably because destroyed by 
later erosion. From the middle of the range north 
it is increasingly represented, especially east of the 
crest. Itis preserved only on the crystalline rocks, 
though the first high escarpment of Paleozoic rocks, 
the Bighorn limestone, seems to come nearly if not 
quite to this level. The projection of the plain 
farther from the crest carries it well above the 
other Paleozoic scarps. Why it has been more 
completely destroyed to the south and on the west 
of the crest, we cannot say. 
Pre-Cambrian Crystallines 
-——— 0 IL ES ————_—_ —_ 
13730 
Fremont Pk. 
=, 
Fic. 2.—Profile across the Wind River Mountains through Fremont Peak. 
