. Annual report of the United States Geological Survey to the Secretary of the Interior . d-water forks of the Brazos. Although widely distributed, they formless than 10 per cent of the total area of the Central Province. Theprincipal group, which may be termed the Callahan Divide, occupiesthe Avatersheds of the Brazos and Colorado, lying approximatelyalong the thirty-first parallel, and extends, like thickly set bridgepiers, from the- western border of the Grand Prairie west to thePlateau of the Plains, through Comanche, Brown, Eastland, Callahan,Coleman, Taylor, Runnels, and Mitchell countie
. Annual report of the United States Geological Survey to the Secretary of the Interior . d-water forks of the Brazos. Although widely distributed, they formless than 10 per cent of the total area of the Central Province. Theprincipal group, which may be termed the Callahan Divide, occupiesthe Avatersheds of the Brazos and Colorado, lying approximatelyalong the thirty-first parallel, and extends, like thickly set bridgepiers, from the- western border of the Grand Prairie west to thePlateau of the Plains, through Comanche, Brown, Eastland, Callahan,Coleman, Taylor, Runnels, and Mitchell counties. North and southof this line, separated from one another by great areas of lower-lyingplain, there are many similar isolated remnants, such as Double Moun-tain, in Stonewall County, and Santa Anna Mountain, in ColemanCounty. Collectively the summits, escarpments, and plateaus thus composedof the horizontal Edwards limestone represent a wide topographiclevel which once extended over nearly the entire Coastward Slope,from the mountain front to the eastern edge of the Grand Prairie and. HILL.] PLAINS OF THE CENTRAL PROVINCE. 47 Bale-ones scarp line. This was a plain (the Edwards Cut Plain) whichoccupied nearly 100,000 square miles of the Texas region. Duringlong periods of degradation, the first of which was in earl} Tertiarytime, prior to the deposition of the Plains formations, the continuityof this level was largely destroyed by erosion, especially in that por-tion which gently arched over the Central Province, resulting in itsalmost entire removal from that area, only the remnantal summitsmentioned being preserved, and the establishment of the two opposingescarpments of the Plains and Grand Prairie, which haAe been grad-ually receding from each other over the Central Province. By the establishment of a diversified drainage upon and below theancient Edwards Cut Plain the main area of the Central Province hasbecome a series of benches successively farther and farther below the
Size: 1310px × 1907px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., book, bookcentury1800, booksubjectgeology, booksubjectwatersupply
