DAVIS: MOUNTAIN RANGES OF THE GREAT BASIN. 155 
Provo block, it is by no means so easy to do justice to the mountain 
form in an unshaded drawing. One reason for this is that the ravines 
here are not very deeply carved — except the larger ones, called canyons, 
whose streams head in subsequent valleys back of the frontal ridge — 
and hence the spurs do not stand forth between the ravines in strong 
relief. Moreover, accompanying and perhaps causing this loss of defini- 
tion in the spurs and facets, there is an increased variety of texture in 
the rock mass, whereby certain resistant strata stand forth bare and 
prominent between weaker neighbors ; the attention is thus involuntary 
somewhat distracted from sculpture and turned toward structure. The 
facets are nevertheless undeniably present, and in essentially the same 
relation to spur and base line as is shown in the type diagram, Figure 8. 
The southern end of the Provo block possesses the most distinct exam- 
ples, some of which will be described in the following section. 
The Wahsatch spurs that descend near Little Cottonwood canyon, 
between Provo and Salt Lake, are systematically terminated by clearly 
recognizable facets. 
The Ogden Wahsatch also offers illustrations of the systematic facet- 
ting of its spurs, those adjoining Weber canyon being the most distinct. 
Further north, back of the city of Ogden, the facets are round-edged, yet 
distinctly recognizable as systematic elements of form, like those of the 
Provo Wahsatch. 
The spurs of several other ranges, seen from train and stage in Utah 
and Nevada, were terminated by facets of more or less distinct form. 
The spurs of the Santa Rosa range were more rounded than many of the 
others, and the terminal facets were indistinct. The eastern face of Pine 
Forest mountains in northern Nevada is notably steep and _ scarp-like, 
descending to a relatively rectilinear base. The scarp is sharply cut by 
narrow valleys which remain narrow to their very mouths. Some of the 
spurs end in rounded facets. Signs of recent faults in the gravels at the 
mountain base were noted, but at too great a distance to feel certain of 
their meaning. The height of the range gradually decreases to its trail- 
ing southern end. In this range more clearly than elsewhere the narrow 
valleys seemed to be cut beneath a rolling upland of earlier origin. 
The Spur-Facets are not Wave-Cut. — The terminal facets of the Wah- 
satch front rise over the Bonneville beaches in such a way as to suggest 
a possible origin as wave-cut cliffs. It is not to be doubted that waves 
could, if time be allowed, cut off the points of spurs so as to truncate 
them in triangular facets, but in that case the facets should be associated 
with certain other features which are significantly absent from the Wah- 
