56 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
side of the maturely dissected Canyon range; this is a sort of curiosity, 
not of compulsory value regarding block faulting, yet quite compatible 
with such an origin for the range, and not reasonably connected with 
any other origin. Another is the oblique course of the scarps on the 
back of the Sawtooth mass; these are not conspicuous features and 
their full meaning was not recognized at first; but it gained increasing 
force the more they were considered. ‘The tamer forms of the sub- 
dued ranges west of Nephi and beyond the Tule flats should not be 
forgotten, for they are useful foils to the stronger forms of the higher 
ranges. But pre-eminent above all the rest are the obliquely trun- 
cated mountain fronts of the Nebo Wasatch north of Nephi, and of 
the Sawtooth mass in the House range. ‘The diagrammatic manner 
in which the hard and soft strata in the monocline of the Nebo 
Wasatch, figure 4, are cut off at the mountain base, with the modern 
fault scarp at the foot of the facetted spurs and the recent small land- 
slide where the base line crosses the weakest layers, give this example 
the rank of a standard type for its class. Yet no less important are 
the corresponding but more maturely sculptured features of the Saw- 
tooth escarpment, figure 22, inthe House range. This is beautifully 
seen from the highest Bonneville beach on a fan opposite the ravine 
that has undercut and sharpened the Sawtooth cliffs, and although 
thus seen only during a short rest on a hot day in the desert, the 
mental picture of it remains as a distinct and greatly prized memory. 
