179 
by Yakima River through the basalt of this rim. Figure 37 shows 
the gradual rise of the basalt northward and its final disappearance 
THE NORTHERN PACIFIC ROUTE. % 
in the hilltops far above river level. 
In some parts the canyon is bounded by rugged walls of basalt 
which makes it somewhat picturesque, but in general there is little 
to attract attention except the interesting geologic 
Bristol. 
Elevation 1,803 feet. 
St. Paul 1,794 miles. 
section that is exposed here. 
opens out and the sides are covered with scattered 
pine trees that are but the fringe of the great mantle 
In places the canyon 
of forest that covers all of the Cascade Range except the highest 
FIGURE 37.—Section showing structure of Yakima basalt north of Ellensburg, | pai The — rises 
from a level below Yakima River near Dudley 
summits and that once extended unbroken to the shores of the 
~ Pacific Ocean. 
The basalt rises steadily and near milepost 18 the 
whitish sandstone and clay of the underlying older formation makes 
its appearance in cuts along the St. Paul road, on the opposite shore 
of the stream. 
The traveler should be prepared to see Mount Stuart on the right 
(north) as the train emerges from the canyon, for the view, if the 
Weather is clear, is superb and lasts for only a few minutes.' 
The white sandstone of the Roslyn formation is visible in a low 
bank on the right near the old station of Teanaway. It rises toward 
* Mount Stuart is the culminating peak 
of a spur which extends eastward from the 
main crest of the Cascade Range. The. 
summit of the peak rises to an altitude of 
9,470 feet, or 7,600 feet above the railway 
at Teanaway station. This granite peak, 
with its deeply carved spires and crags, 
more or less covered with snow throughout 
the summer, is the most striking feature 
in the varied scenery of the region; but 
its wildest and grandest scenery lies hid- 
den within its own fastnesses. 
The southern face of the mountain is a 
precipitous slope, rising 5,000 feet or more 
above the creek which flows at its foot. 
The lower part of this wall can be scaled 
at several points, but by only one route 
has the highest peak been attained by the 
mountain climber. This peak is so acute 
that the greater part of the available 
space is taken by the United States Geo- 
logical Survey triangula ation monument 
which crowns its summit. 
On the north side of Mount Stuart are 
broad and deep amphitheaters, in which 
‘ trai 
only a few hundred 
these exhibit most of the 
features of larger ice streams. 
It is apparent that Mount Stuart is 
different from Mount Adams, which, as 
seen from a point near Toppenish, con- 
sists essentially of a gigantic cone resting 
upon the broad platform of the Cascade 
Range. Mount Stuart, as can be seen 
from Teanaway, is rugged in the extreme 
and consists of a serrate ridge with one 
