. The geography of Texas, physical and political. tness 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
. The geography of Texas, physical and political. tness 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 Plateau is the smallest of the three divi-sions, embracing the area between the Rio Pecos and the. Fui. 12. Scene ox Stockton PlateatFort Stockton in the distance; a mesa in the background Trans-Pecos mountains, an area cut off from the Edwardsplateau by the Pecos valley. Its general appearance iswell shown in Figr. 12. The Edwards Plateau is a continuation of the Grandprairie, from which it has been separated by the valleyscut by the Colorado river and its tributaries. Like theGrand prairie it is underlain by Cretaceous rocks. Along 24 THE GEOGRAPHY OF TEXAS its eastern and southern margins it has been much dis-sected and, as a result, is fringed with flat-to2:)ped hills.(Such hills are seen along the Colorado river west ofAustin.) The summit is in the form of a level an altitude of about a thousand feet along its easternand southern scarps the plateau rises towards the north-west, where it blends imperceptibly with the Staked plains.
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