200 STRUCTURAL GEOLOGY. 



0-wi-yu-kuts cliff overhung the Tertiary sandstones that form the base of 

 Diamond Peak. 



This double movement along the plane of the Uinta fault is seen 

 farther west beyond Red Creek, where it was first discovered, and where 

 the sandstones of the Point of Rocks period are found to have been 

 dragged down by the later arid southward throw. Similar evidences are 

 seen farther eastward, between Diamond Peak and Red Creek, and the 

 topographic features of the region in like manner give evidence of the 

 later movement, for some of the peaks composed of Bitter Creek sand- 

 stones are higher than the mountains and plateaus of quartzite and Uinta 

 Sandstone. To the east of Diamond Peak this second displacement did 

 not follow the old plane of faulting, but trended irregularly northward 

 and bent downward the edges of the beds which originally abutted against 

 the southern wall of the fault, which was composed of Uinta Sandstone and 

 underlying rocks. Subsequent degradation has earned away the upper 

 part of these beds that were turned down, and we now see fragments 

 standing on edge and the younger beds are on the south side, the older 

 beds on the north side, a fact which I have stated in a former chapter, and 

 which is thus explained. But we have still further evidence of this later 

 throw on the south side. The beds of the Brown's Park Lake were 

 deposited against the foot of Diamond Peak, and this later displacement 

 was subsequent to the deposition of these beds, and the plane of faulting 

 cuts them in twain. Those fragments on the north side of the fault lie 

 high upon the side of Diamond Peak, while the beds on the south side of 

 the fault are low down in the valley at the foot of the peak. The latter 

 are nearly horizontal ; the former have a general dip southward, but are 

 broken and greatly contorted. 



This mountain, of origin so strange, was curiously enough the scene 

 of the great diamond bubble, so skillfully burst by my brother geologist, 

 Clarence King. 



THE DRY MOUNTAINS. 



This low range of mountains extends in a southeasterly direction from 

 Vermilion Creek to the Snake River, and, topographically, appears to be a 



