. The geography of Texas, physical and political. 7. Black Mesa A dome of Lower Cretaceous limestone due to the intrusion of igneous rock,as seen from Mariposa Store, Terlingua, Brewster county 6800 feet; and Mount Emory, in the Chisos mountains,9000 feet. The Guadalupe mountains are made up largely ofPermian rocks. The Sierra Diablo is an old dissectedhighland capped with Carboniferous rocks. The Davis,known also as the Limpia, the Corazones, and the Chisosmountains are volcanic. There are also flat-topped moun-tains, or mesas, capped with volcanic rock, the remains ofan old igneous outpourin
. The geography of Texas, physical and political. 7. Black Mesa A dome of Lower Cretaceous limestone due to the intrusion of igneous rock,as seen from Mariposa Store, Terlingua, Brewster county 6800 feet; and Mount Emory, in the Chisos mountains,9000 feet. The Guadalupe mountains are made up largely ofPermian rocks. The Sierra Diablo is an old dissectedhighland capped with Carboniferous rocks. The Davis,known also as the Limpia, the Corazones, and the Chisosmountains are volcanic. There are also flat-topped moun-tains, or mesas, capped with volcanic rock, the remains ofan old igneous outpouring. 28 THE GEOGRAPHY OF TEXAS The second line of elevations enters the state with theHueco iivereo) mountains, and is continued by theFinlay, Quitman, Eagle, and Vieja {ve-dhd) mountains. In these mountains there are found granite and otherigneous rocks, as well as Carboniferous and Cretaceouslimestones. The Chinati mountains are volcanic. Between the mountains of Trans-Pecos Texas there arenumerous basins or flats. These plains, though elevated,. Fig. 18. View towards the Foothills of Quitman Mountains differ from ordinary plateaus. They are not capped withhard layers, but are usually covered with the waste broughtdown from the adjoining slopes. This is a region of sudden contrasts. From the sandyplains mountains quickly rise, sometimes alone, some-times in groups ; here sharp summits are outlined againstthe sky, there great rounded domes; again flat-toppedmesas appear, with steep scarps and deeply cut ravines. RELIEF AND SOILS 29 Salt basin lies for the most part between the Delawaremountains, a southeastern extension of the Guadalupemountains, and the Sierra Diablo. Its interior drainageis collected in a series of salt lakes. The Rio Grande issaid to flow through a chain of old basins, connected bycanyons, until it reaches the apex of the Great Bend inBrewster county. 31. Soils. The thin, unconsolidated outer covering ofthe earth which supports vegetation is known as
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