📘 You are leaving on a crease
Look down. A tight knot of towers sits on a held-still river. West of them the land bunches into dark, juniper hills. East it goes smooth and the fields turn a deeper green. That is Austin, and the crease under the wing is the Balcones Esca
What you’ll learn
- Austin crease and scaleRead austin crease and scale from the window.You are leaving on a crease; You cannot see the whole of it.
- Wet east and dry westRead wet east and dry west from the window.Then a table of circles; A river sawed a hole in the table.
- Plateau, canyon and coastRead plateau, canyon and coast from the window.The north wall is another river; Oil found the wet side first.
Questions this course answers
What causes the green-to-tan colour change across Texas?
Handbook of Texas precipitation figures fall from Orange to El Paso.
What is the Balcones Escarpment?
Texas Almanac treats the Balcones Fault as the interior limit of the Gulf Coastal Plains.
What do center-pivot circles on the Llano Estacado indicate?
The course links High Plains irrigation discs to water pumped where rainfall is low.
Grounded in trusted sources
- Texas Almanac — “Texas' Natural Environment”: land and water area 268,596 square miles (U.S. Census 2010), 261,232 land and 7,364 water; second in size after Alaska (665,384) and larger than California (163,695); longest north–south 801 miles from the northwest corner of the Panhandle to the southern tip on the Rio Grande below Brownsville; greatest east–west 773 miles from the eastward bend of the Sabine in Newton County to the western bulge of the Rio Grande above El Paso; Guadalupe Peak 8,749 feet, El Capitan 8,085 feet, both Culberson County / Guadalupe Mountains National Park; boundary following smaller meanderings: Rio Grande 1,254 miles, tidewater coastline 624 miles, Sabine 292 miles, Red River 726 miles
- Texas Almanac — “Physical Regions” (reviewed by David R. Butler): four principal physical regions Gulf Coastal Plains, Interior Lowlands / North Central Plains, Great Plains, Basin and Range; interior limit of the Coastal Plains is the Balcones Fault and Escarpment from near Del Rio through Bexar, Comal, Hays, and Travis counties, intersecting the Colorado immediately north of Austin; Pine Belt / Piney Woods extends 75 to 125 miles into Texas from the east, Red River to within about 25 miles of the Gulf; Blackland Belt from the Rio Grande to the Red River, 15 to 70 miles wide, just below the Balcones, the principal cotton area until the 1930s and still the most thickly populated belt; High Plains / Llano Estacado a vast flat plain, 2,700 feet on the east to more than 4,000 along the New Mexico line; Caprock Escarpment 200 to nearly 1,000 feet; Edwards Plateau from about 750 to about 2,700 feet, limestone, cedar–oak–mesquite, nation’s leading Angora goat and mohair region; Trans-Pecos the only mountainous part of Texas
- Handbook of Texas Online — George W. Bomar, “Weather”: mean annual precipitation 59.20 inches at Orange in the lower Sabine valley to 7.82 inches at El Paso; decreases about an inch for each fifteen-mile displacement from east to west; Trans-Pecos regionwide 11.65 inches, Upper Coast 45.93, East Texas 44.02; Balcones Escarpment from Austin south to San Antonio then west to Del Rio one of the nation’s three most flash-flood-prone regions
- Handbook of Texas Online — Phillip L. Fry, “Texas, Origin of Name”: among East Texas Indians the word texas / tejas / tayshas usually meant “friends”; the Hasinai applied it to allied groups; Francisco de Jesús María recorded texias as “friends,” a name for groups allied against the Apaches; state motto “Friendship” carries that meaning
- Handbook of Texas Online — C. T. Neu, “Annexation”: Texas Congress and a convention voted for annexation in 1845; United States Congress accepted the state constitution on 29 December 1845, the date of legal entry into the Union; formal transfer 19 February 1846, President Anson Jones to Governor James Pinckney Henderson
- Handbook of Texas Online — “Republic of Texas”: convention at Washington-on-the-Brazos adopted a declaration of independence on 2 March 1836; fifty-eight members ultimately signed
- Handbook of Texas Online — David G. McComb, “Houston, TX” / Robert Wooster and Christine Moor Sanders, “Spindletop Oilfield”: San Jacinto 21 April 1836; Lucas geyser at Spindletop, 10 January 1901, oil over 100 feet high, estimated 100,000 barrels a day
- Handbook of Texas Online — Julia Cauble Smith, “East Texas Oilfield”: Daisy Bradford No. 3 completed 3 October 1930; about 140,000 acres; nearly 5.2 billion barrels; largest reservoir in the contiguous United States
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