. Book of Texas . on the east and also from the Staked Plains on the west, isdivided into north and south portions by the CallahanDivide, and into east and west portions by the Coal Meas-ures and the Red Beds. (See the geological map on page 71)The northwestern edge of this whole middle third is markedtoward the north by the Staked Plains, or Llano Estacado THE LAND G5 Scarp, commonly known as the Breaks of the Plains, andtoward the south by the Pecos Valley. The northwestern third of the state rises to 4,000 feet alongthe New Mexico line and divides itself northeast of the PecosRiver into the
. Book of Texas . on the east and also from the Staked Plains on the west, isdivided into north and south portions by the CallahanDivide, and into east and west portions by the Coal Meas-ures and the Red Beds. (See the geological map on page 71)The northwestern edge of this whole middle third is markedtoward the north by the Staked Plains, or Llano Estacado THE LAND G5 Scarp, commonly known as the Breaks of the Plains, andtoward the south by the Pecos Valley. The northwestern third of the state rises to 4,000 feet alongthe New Mexico line and divides itself northeast of the PecosRiver into the North Plains, or Panhandle, and LlanoEstacado, or Staked Plains, and the South Plains; south-. west of the Pecos it divides itself into the Stockton Plateauand Mountain Region. All Texas, therefore, slopes upward in a northwesterlydirection toward the New Mexico and the Colorado great deal of Texas is very flat or gently rolling are to be found in parts of the middle third, sometimes 66 THE BOOK OF TEXAS thickly enough scattered to form considerable areas of roughcountry. The only real mountains in Texas are in the westand are only lower parts of the Rockies. In the Trans-Pecos there are 78 peaks above 5,000 feet in elevation, 35peaks above 6,000 feet, 10 peaks above 7,000 feet. ElCapitan (8,690 feet), in the Guadalupe Mountains, andBaldy Peak (8,382 feet), in Jeff Davis County, are the only 4500feet40C0 3500 S000 2500 2000 1500 1000 500 Ofeet j\ 0\1 ** 00 IT) oo\ ?4 o 00 lO r—1 no 00 o oo 00 TJ r-1 o IVJ o 1 O o .— _J o ^ [r—1— OO r = ID 1 —t—1 a3 o JZ o 5 •a ina. E- T co -t-> 1— c O -t-» I—C/) > — 03 LL. o en -Q&l
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