136 GUIDEBOOK OF THE WESTERN UNITED STATES. 
Peach Springs to the bank of the Colorado. The walls of the Grand 
Canyon are not as high here as in the region farther east, yet it still 
has a deep inner gorge of granite extending up to cliffs and slopes of 
sandstones and shales of the Tonto group surmounted by high cliffs 
of Redwall limestone. The escarpment or cliff of Redwall limestone 
is prominent south of Peach Springs, where it gradually attains a 
high altitude, and it extends nearly due south for many miles. 
From Cherokee nearly to Truxton the valley widens greatly and is 
floored by gravel and sand washed from the adjacent mountain slopes. 
At Truxton the valley merges into a gorge in which 
appears the granite underlying the Tonto group. 
ie toni: FMS granite extends northward to the foot of Music 
Mountain, a high cliff and peak which is promi- . 
nently in view 7 miles to the northwest from the vicinity of mileposts 
475 and 476. It is the same rock that is exposed in the lower part of 
Truxton. 
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Valentine Crozier ue Truxton 
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Truxton, Ariz, A, Section across the canyon east of Valentine, looking west; B, section song! Ge 
canyon, looking north, ad 
the Grand Canyon. Music Mountain is the southwest corner of the 
Grand Wash Cliffs, of which more can be seen from Antares, 18 miles 
farther west. 
A short distance west of Truxton there appears to be a great 
fault crossing the railway, with the uplift on its east side. It is 
probably the southern extension of the fault extending along the 
west foot of the Grand Wash Cliffs shown in figure 33. On the 
west side of this fault the railway passes into a lava field and for 
somé distance follows a narrow canyon in the lava. 
On approaching Crozier the train passes below the edge of the lava 
cap into a gorge in the underlying granite, which is prominent in the 
a : lower walls of the canyon nearly to Hackberry. The 
PE SS relations of the lava to the granite are well exposed 
KansasCity 1,402miles, DebWeen Crozier and Valentine, as shown in figure 33. 
The lava sheet constitutes an extensive elevated shelf 
or plateau north and south of Crozier and Valentine. It lies on 
