. The geography of Texas, physical and political. 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 f
. The geography of Texas, physical and political. 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 Fig. 13. Scarp of the Staked Plains, Blanco Canyon,Crosby Coi nty The Staked Plains, or the Llano Estacado, are underlain bysofter rocks. They are very level, — so level as to pro-duce the peculiar appearance of being uphill in everydirection, — yet they really dip quite gently to the south-east. Along their eastern margin or scarp they are deeplycut by steep-walled valleys, or canyons, which have beenfoi-med by the wearing action of the head waters of theRed, Brazos, and Colorado rivers. In the northwestern RELIEF AND SOILS 25 part of the Panhandle this region attains a height of overfour thousand feet. 30. Region of Mountains and Basins. Between the RioGrande on the one side and the Rio Pecos and theStockton plateau on the other there are two or more linesof mountain elevation. The first includes the Guadalupe
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