DAVIS: THE WASATCH, CANYON, AND HOUSE RANGES. 33 
earlier cycle of erosion than the one now current. The eastern bor- 
der of the range, as far as we could see it, seemed remarkably abrupt. 
Two east and west sections were rapidly sketched, as in figures 11 and 
12, and are offered for correction by later observers. The strata cer- 
tainly show abundant deformation and require great erosion in fash- 
ioning the present form of the range. Over a thousand feet of 
limestones and probably several thousand feet of quartzites were 
Seen: they are believed to be of Carboniferous age. ‘The western limb 
of the limestone anticline in the northern section along Oak creek 
Seemed to be replaced by a fault in the section a few miles farther 
South along Dry creek. Figure 13 represents a more detailed view 
Fic. 13.— Detailed section on east slope of Canyon range, opposite the head of 
Oak creek; length of section about 1200 feet. 
of a sharp shear or fault on the steep eastern slope of the range some- 
What north of the col at the head of Oak creek. A mile or two 
farther south, no such deformation appeared; the eastern slope there 
was formed by outcrops of west-dipping limestones; hence it was in- 
ferred that the shear or fault in the northern section did not trend 
parallel to the eastern face of the mountain. If all the erosion indi- 
cated by these sections had taken place in a single cycle, it does not : 
seem possible that the western border of the range could have its 
present relatively simple pattern. The range is therefore provi- 
Sionally regarded as a fault block, perhaps faulted on both sides, 
