SOUTHERN PACIFIC LINES 53 
capped by a sheet of alluvium which constitutes the terrace on which 
Columbus is built. This terrace extends west a short distance and 
abuts against or gives place to an upland of eastward-dipping reddish 
beds that contain much gravel and are regarded as the Lissie forma- 
tion. These beds are well exposed in the railroad cut through the 
divide 2 miles west of Glidden. The Lagarto-Lissie contact makes 
a strong reentrant down the Colorado River Valley, and the railroad 
skirts this contact to a point about 4 miles west of Glidden before 
finally entering the Lagarto, which it crosses at an angle of about 120° 
to the strike. (See fig. 4.) From Glidden a branch railroad extends 
to Lagrange, on the Colorado River. 
WwW 5 ¢ Ee. 
2 = 2 
- Sa % q S 
°: ik ere and een oS 3 - t 
“2.0% Terrace St Ri 
ous sandstone (Lagarto) sesncn ae >" {deposits 
Horizontal scale i 
° ' 2 Miles 
t : 
i i 1 
Vertical scale 
300 600 Feet 
a ok 
Freure 4.—Section along the Southern Pacific Railroad through Columbus and Glidden, Tex. 
The clays and soft sandstone of the Lagarto formation extend west 
to and beyond Schulenburg. The outcrop zone of the Lagarto strata 
is mostly a rolling, treeless prairie of black calcareous clay, very heavy 
when wet, or, in the area of outcrop of the less argillaceous beds, a 
sandy loamy soil. Near the eastern contact post oaks and live oaks 
indicate that the higher elevations are capped with Lissie gravel. 
(Turn to sheet 8.) 
In the vicinity of Weimar, about 2 miles east of the Fayette County 
line, the railroad attains the summit of one of the higher ridges in 
Colorado County constituting the divide between the Colorado and 
Navidad Rivers. Southeastern Fayette County, however, has been 
eroded by the two forks of the Navidad to an area of low relief. 
are possibly stained by the iron 
the: sils, locally abundant, have been found 
oxide lesiched from the Lissie, in pastel i 
glomerate and limestone. near the top 
may represent the overlying Reynosa 
formation. A few vertebrate remains, 
mostly of horses, and chara stems, to- 
gether with reworked Cretaceous fos- 
mi 
fauna indicating a shore line slightly 
inland from the present coast. The 
formation is about 1,200 feet thick, 
and it dips to the southeast about 
| feet to the mile. 
