DAVIS: MOUNTAIN RANGES OF THE GREAT BASIN. 153 
those deduced for the ideal type in its maturely dissected stage. A front 
view of the facetted spurs is given in Plate 1, a. The ridge or crest line 
of the spurs slopes at angles that do not vary greatly from 25°. Figure 
11, enlarged from photograph and sketch, presents a more detailed view 
of this part of the Wahsatch, in which the sharp-crested ridges, with 
their peculiarly systematic terminal gullies and facets, rise between the 
sharp-cut ravines of the mountain front. The difference between these 
beautifully sculptured forms and the more rigid diagrammatic features of 
Figures 6 to 10, is not a difference of kind, for every element in the 
ideal view is matchable with a corresponding element in the actual view ; 
it is rather a difference due to the occurrence in nature of innumerable 
Figure 11. 
View of the ravines, spurs, and terminal facets of the Spanish Wahsatch, looking east; 
drawn from sketch and photograph. 
little irregularities, the result of slight variations of rock mass and of 
sculpturing process, whereby actual mountains depart in so pleasing and 
graceful a manner from the hard and conventional lines of diagrams. In 
spite of these differences, the notable characteristic of this part of the 
Wahsatch front is its model-like form, every element of which is so sys- 
tematically arranged that it can be understood: and thereon depends 
much of its attractiveness. The expression of its features is open and 
frank, without that complication of unresolvable elements which makes 
the meaning of larger mountain forms so difficult of full understanding. 
One reason for the simplicity of form here exhibited is the simplicity 
of rock-structure in the mountain block. The strata of which it is 
built lie nearly horizontal in the district that we examined, and none 
of them are sufficiently unlike their neighbors in strength or weak- 
ness to determine the occurrence of strong cliffs or benches. There 
