132 GUIDEBOOK OF THE WESTERN UNITED STATES 
in the first railroad cut on the west side of the river. It is overlain 
by nodular and slabby limestones and shales containing large numbers 
of Washita fossils and grading up into a thick mass of dark shale in 
which there are deep cuts extending to and beyond Brickland siding. 
This shale is extensively worked for brick, hollow tile, etce., on the 
west bank of the river a short distance below the two railroad bridges.®” 
The relations are shown in Figure 27 (p. 134). 
Just beyond Anapra siding, where the north and south lines are 
close together and joined by switches to be used in case of necessity, 
Anapra. the railroad grade ascends the terrace of valley fill, 
Elevation 2,90 fect, 'U® @dge of which margins the Rio Grande Valley in 
Population 7" long line of steep slopes. The top is attained near 
New Orleans 119% Strauss siding. Along the upgrade are many fine 
meee exposures of the gravel and sand of which the terrace 
is composed. This material was deposited by the Rio Grande at an 
earlier stage of its history, when it flowed west of the Cerro de Muleros 
PRES and another high range to the south and emptied 
into the Guzman Basin in Chihuahua, Mexico. This 
Elevation 4,104 feet. i‘ 
Population #2.° was before its present course was developed through 
New Orleans 1,2 the ‘‘pass” at El Paso. Looking east from this grade, 
— the traveler gets fine views of the long west slope of 
the Franklin Mountains, with its succession of westward-sloping 
4. Marl, brown, shaly; sand- and other fossils indicative of the Del 
sto 
ne and limestone with — Feet Rio horizon of the upper part of the 
Alectryonia quadriplicata. 30-65 | Washita group (Comanche, Lower Cre- 
5. Marl, sandy, with shales taceous age). The shale is overlain by 
and beds of li bro istone (possibl t 
estone 
OOS 5 tre occ dele os seg 100-165 
6. Shale, marl, and limestone, 
- Pervinquieria nodosa___- 
ck 
err: 100-165 
7. Limestone, sandy, 
, and black 
shale with Ozytropidoce- 
ras cf. O. belknapi______ 
30 
8. Marl, brown, with beds of 
: 
: 
z 
: 
30-65 
Sm en a a 
weet ee ee ee 
oa part of the shale are | 
he xh I ~ yur Le, 
Eagle Ford or the basal formation of the 
| Upper Cretaceous), which is well ex- 
posed in a cut about 1 mile beyond the 
bridge, and this in turn is overlain by 
massive white limestone, also of Upper 
Cretaceous age, which is conspicuous 
near the tracks at intervals in the next 
half mile west. It contains numerous 
large shells of a species of Exogyra, a 
part by the margin of the high- 
level deposits of the Rio Grande Valley, 
h, 5) 
(“Dete consisting mostly of boulders of 
yry from the near-by Cerro de 
Muleros, 
