162 GUIDEBOOK OF THE WESTERN UNITED STATES 
massive platy structure that gives it the appearance of limestone in 
some lights. Rincon Peak, a high summit in the southern part of the 
range, is 8,465 feet above sea level. 
The Whetstone Mountains are in full view to the south from 
points near Mescal. The higher parts of the Rincon, Whetstone, and 
other mountains to the north and south are included in the Coronado 
National Forest so that their pine timber may be conserved. 
N. 
Carboniferous 
> 
Lower 
Se — 
La oa f =——r 7 
CN “Geenite rent 
PEND A 
bal iad 
Horizontal, ou : 
2 Miles 
ciitsnadbiiiabialnitiatn 
Vertical scale 
‘1,000 Feet 
Figure 39.—Sketch secti th rth t end of the Whetstone Mountains, Ariz. 
SOUTH LINE FROM EL PASO, TEX., TO MESCAL, ARIZ. 
Several trains go to Tucson (see sheet 18, opposite p. 136) over the 
former El Paso & Southwestern Railroad, which has a more southerly 
route than the original Southern Pacific line by way of Deming and 
Lordsburg and joins the north line at Mescal, 40 miles east of Tucson. 
It parallels the north line for the first few miles out of El Paso, crossing 
the Rio Grande in the western part of the city, into the southern part 
of New Mexico, skirting the north side of the Cerro de Muleros 
(moo-lay’ros); it diverges from the north line beyond Anapra siding. 
(See p. 132.) Just west of the Rio Grande it passes through an area of 
Cretaceous strata adjoining the intrusive mass of the Cerro de Mule- 
ros, which makes the south or Mexican side of the ‘‘pass” from which 
El Paso isnamed. The strata exposed are mostly dark shale of upper 
Washita age in which there are long cuts, beginning a few rods beyond 
Praha the west end of the bridge and extending west to and 
Elevation 3.845 ft. beyond Bowen, a siding at the west end of a tunnel 
Population 20 through the shale. Below the shale are limestones of 
~ New Orleans 1,193 
miles. 
Washita and Fredericksburg age (Comanche series), 
the latter extensively exposed in the cement quarries @ 
short distance north of the river bridge. (See also p- 131.) (See fig. 
40.) In the upper part of the dark shale are sandy beds containing 
‘Nodosaria”’ and other forms indicating Del Rio age. Itisoverlain by 
_ ahard sandstone probably basal Upper Cretaceous (Eagle Ford), which 
is conspicuous on the ridge just west of the railroad near the tunnel 
__ and crosses the railroad half a mile beyond Bowen. This sandstone 
