168 GUIDEBOOK OF THE WESTERN UNITED STATES. 
above the level of the valley. As shown in figure 44 this mountain 
is a great stock or mass of granite, much younger than the granite 
of the main mountains, that has been forced up through some crevice 
from below. It is much harder than the surrounding shale and hence 
stands up as an isolated mountain mass. The elevation of the valley 
ere is so great that few grains will mature, but 
Doyle. fine crops of hay are grown and the level valley 
Elevation 8,062 feet, floor is dotted here and there with ranches. Doyle, 
Population 122.* the center of much of this fine meadow land, is 
Denver 270 miles. connected by stage with Waunita Hot Springs, 
about 8 miles to the south, which is said to be a very beautiful health 
and pleasure resort. 
Below Doyle the valley grows narrower, and within about 3 miles 
from the town the Dakota sandstone rises from the floor of the valley 
and makes prominent ledges 
on either side. This sand- 
stone is underlain by the 
variegated shale and sand- 
stone of the Gunnison for- 
mation, and this in turn 
Tomichi Dome SE. 
Bay 6 meee rests directly upon the 
toe ke 
granite, which forms the 
ing the great mass of crystalline rock (a) that foundstion of this moun- 
has forced its way upward, while in a molten tain region. The Dakota 
condition, through the older granite (b) and sandstone rises onl a few 
% hundred feet above the level 
of the stream, and the underlying rocks are worn into fantastic 
shapes, as can be seen on the north (right) side of the valley. 
From the point where they first appear to a point a few miles be- 
yond the town of Gunnison the Dakota and the underlying Gunnison 
formation on the north side of the valley are continuously from 50 
to about 300 feet above the level of the stream. In general, the 
valley continues wide and includes many hay fields. 
— ce the mouth of Quartz Creek (see sheet 
Elevation 7,052 feet. 6, Dp. , is the principal town in this area. 
hebraige pak {t was formerly connected with Buena Vista by a 
_ harrow-gage line of the Colorado & Southern Rail- 
way, but owing to the caving of the tunnel at the summit of the 
range service on this line has been discontinued. This branch was 
originally built down the valley to Gunnison, and the old track is 
visible at several places on the right. On the south side of the valley 
the sedimentary rocks can be traced to Parlin, but below this place 
the granite that forms the lower slopes is overlain by a great mass 
of volcanic rocks, These rocks cover every high point that projects 
Parlin. 
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