. The geography of Texas, physical and political. Fig. 10. View on the Plains between Childress and Matador plateaus on the west. It is separated into two parts by ahilly watershed between the Brazos and Colorado rivers,known as the Callahan divide. ^ Here stream wearand rock decay have not yet completely severed the con-nection between the prairie region and that of the plateaus, 1 See Physical Geography of the Texas Region, by Robert T. Hill(Folio 3, Topographic Atlas of the United States), p. 7. Washington, 1900. 22 TIIK GEOGRAPHY OF TEXAS as is shown by the flat, limestone-capped hills. Wi
. The geography of Texas, physical and political. Fig. 10. View on the Plains between Childress and Matador plateaus on the west. It is separated into two parts by ahilly watershed between the Brazos and Colorado rivers,known as the Callahan divide. ^ Here stream wearand rock decay have not yet completely severed the con-nection between the prairie region and that of the plateaus, 1 See Physical Geography of the Texas Region, by Robert T. Hill(Folio 3, Topographic Atlas of the United States), p. 7. Washington, 1900. 22 TIIK GEOGRAPHY OF TEXAS as is shown by the flat, limestone-capped hills. Widelyseparated but similar hills are found both to the northand to the south. Within the Central basin there is a varying relief depend-ing upon the hardness or softness of the underlying the area of the Carboniferous, for example, where shalesprevail, there are stretches of level prairie; where sand-stones and other hard rocks occur, hills and Fig. 11. Childress. A Citv of the Plains In the Permian or Red beds area, on account of thesoftness of the rocks, the relief is not prominent, the gen-eral effect being that of a series of rolling plains. The southern part of the basin includes the granite areaof Burnet and Llano counties, with its fringe of Cambrianand Ordovician rocks. The relief here developed is sostrong as to be spoken of as mountainous. 29. Region of the Plateaus. The region of the plateausis well marked. It is separated from the Central basin byan eastward-facing escarpment, and from the Rio Grandeplain by a dislocation of the underlying rocks known as RELIEF AKD SOILS 23 the Balcones scarp. It is limited on the south by theRio Grande and on the southwest by the Trans-Fecosmountains, while its western boundary is the valley of theRio Pecos in New Mexico. This region consists of the following divisions: a. The Stockton Plateau. b. The Edwards Plateau. c. The Staked Plains, or the Llano Estacado. The Stockton Pla
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