SOUTHERN PACIFIC LINES 
Cretaceous formations of the Coastal Plain in central Texas 
65 
Age Group Formation Character aa 
Navairo...cec Shale and marl; some sandy layers_-_| 400-500 
a Eig Tayier Se Sihlecs ot es ee 475+ 
( Anstin | jG oeons! Chalk and chalky limestone__.__.__- 300 
Eagle Ford_._-..- Shale and slabby limestone_____-___- 25 
Unconformity 
BUGS... sata seen Limestone, massive 
Washita. Del Hiss cscocccd ped buff_ 50-70 
Cectgutiad se one estone, massive 75+ 
vo Pope rece Recek aoe Limestone, massive; some chert_____ 400-500 
( “ © | Fredericksburg. Comanch Peak__| Limestone, slabby 50+ 
a SCN SWealnut...._....- Clay and shaly limestone_____--___- 50-70 
+t Glen Rose__...-.- ears vin and shale 700+ 
Trinity. Travis Peak_____- Sandston 
The Cibolo River (Spanish, buffalo), a small stream crossed at 
Schertz, drains a portion of the Edwards Plateau west of San Antonio. 
On the plain to the west, south of the railroad, is the 
great aviation establishment of the United States 
Cibolo. 
, a 8 ea Army, known as Randolph Field. It was completed 
opulation 262. ne ot 1931, with an area of 2,320 acres. Its capacity is 
New, Deane §4 lets. 4-000 manh-* "Phe high tower of its central administra- 
Heberts. tion building is conspicuous from afar, as are also the 
great with checkerboard roofs. This estab- 
Population 315. lishment cost $25,000,000; the site was presented to 
New Orleans 557 miles. 
the Federal Government by the city of San Antonio. 
The smooth, broad plain at this place has been de- 
veloped on the soft clay of the Taylor formation. 
Not far beyond the small village of Converse some of the high 
buildings of San Antonio are visible in the distance, and beyond 
Kirby siding part of Fort Sam Houston is in sight on a high terrace 
north of the railroad. 
Antonio is a metropolitan center for a wide area in south- 
central Texas and until a few years ago was the largest city in the 
State. Its growth in population from 1920 to 1930 
San Antonio. = was 43.5 per cent. It has numerous manufactures, 
Pcaiciun Moe large educational institutions, and a variety of busi- 
573 miles. NESS interests. It is an old settlement dating back to 
anish mission days and, as San Antonio de Bexar, 
was long the capital of Tejas in New Spain under Spanish and 
Mexican rule, with a tutory marked by many sanguinary episodes. 
