94 GUIDEBOOK OF THE WESTERN UNITED STATES 
especially conspicuous. 
Altuda Mountain is capped by Capitan 
limestone, which forms a prominent cliff on its upper slope. At one 
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FiGuRE 11.—Diagrammatic section showing livnologic variations in the Permian in the Glass Mountains, Tex. By P. B. King 
point, as shown in Figure 13, 
there is an outlying mass of 
Comanche limestone. South 
of Altuda Mountain the Word 
and Leonard formations are 
tilted steeply northward away 
rom an intrusive mass of 
syenite, which forms a dark- 
colored knob west of Altuda 
siding. On the northwestern 
or back slope of the Glass 
Mountains, in view north of 
Altuda, remnants of Comanche 
limestone may be seen, resting 
on the Capitan limestone. 
At Altuda the railroad runs 
nearly north to pass around the 
north end of the Del Norte 
Mountains and in the main is 
in a wide valley floored with 
alluvial wash from the ad- 
joining mountain slopes. 
From this plain rise several 
knolls of the underlying rocks, 
which indicate faulted struc- 
ture, though the details are 
hidden by sand and gravel. 
Near Strobel siding the north 
end of the Del Norte Moun- 
tains is passed and the struc- 
tural relations are well exposed. 
Here heavy ledges of Edwards 
and Georgetown limestones, 
dipping west and cut by two 
faults, pass beneath Upper Cre- 
taceous rocks, and these in turn 
under the great voleanic suc- 
cession (Tertiary) which ex- 
tends far west in the Davis 
Mountain region. In the val- 
ley just south of Strobel are 
railroad ascends and passes around the curve, there are very fine 
