DAVIS: THE WASATCH, CANYON, AND HOUSE RANGES. 51 
The case of the simple monocline eroded in a single cycle will be 
first considered. If the present southeast dip of the strata in the Saw- 
tooth mass were the result of a single deformation, long acted on by 
normal erosive processes, a series of ridges and valleys trending north- 
east and southwest would be the inevitable result, and these features 
would continue as far as the longitudinal extent of the monocline; 
the general altitude of each ridge in a late stage of erosion would de- 
pend on the resistance of its strata; notches and water gaps might be 
cut here and there, but no persistent increase of height in one direction 
for ten or more miles could be expected. On turning to the observed 
facts, it is evident that they strongly contradict these consequences of 
a single cycle of erosion. The ridges or scarped edges of the harder 
layers die away at the eastern base of the range, although there is no 
indication that the monocline terminates there; it has every appear- 
ance of being continued under the gravels of the eastern piedmont 
slope, which are indeed interrupted here and there by undetermined 
mounds for some distance out towards the Sevier desert plain. To 
the southwest, the scarps are sharply cut off in the fine escarpment of 
the range; and between these two unlike endings they show a gradual 
increase in height, locally interrupted by notches and valleys. The 
Supposition of a single cycle of erosion is therefore altogether inade- 
quate to explain the facts. 
In the second case, if the fault block of monoclinal structure were 
uplifted with an eastward slant before much erosion of the preexist- 
ing monocline had been accomplished, then the recession of the vari- 
ous ridges or scarp-making layers from the crest of the block must 
have been effected since the faulting. Such a recession might well 
result in due time in the formation of a number of ridges on the 
back slope of the block, but each ridge should then continue its 
course far northeastward to the end of the block along the strike 
given to its strata by the combined movements of the two periods of 
deformation. As a matter of fact the back-slope ridges in the Saw- 
tooth mass run obliquely down from the crest of the range to its east- 
ern base and there fade away. Hence the supposition of faulting 
before the pre-existent monocline was much eroded is also unsatis- 
factory. 
In the third case, if the southeast-dipping monocline were much 
eroded before the north-south block faulting occurred, then the back 
Slope of the tilted block should be obliquely ascended by belts of 
hard and soft strata, sculptured into appropriate relief; and these 
oblique features would be altogether destroyed only after much ero- 
