. Bulletin - United States National Museum. Science. 60 BULLETIN 61, UNITED STATES NATIONAL MUSEUM. iiK^ridian. As here defined, the prairie-plains region inchides the "Central Province" of Hill and the strip of prairie that extends southward from Austin to the Rio Grande plain. The Rio Grande plain, as we use the term, is synonymous with the "Lower Rio Grande Country" of Hill (see fig. 21). To the east of the East Front Ranges, the western Texas region descends from the high plateaus bordering the Rocky ]\[ountains in northern New Mexico b}" a series of broad plains a
. Bulletin - United States National Museum. Science. 60 BULLETIN 61, UNITED STATES NATIONAL MUSEUM. iiK^ridian. As here defined, the prairie-plains region inchides the "Central Province" of Hill and the strip of prairie that extends southward from Austin to the Rio Grande plain. The Rio Grande plain, as we use the term, is synonymous with the "Lower Rio Grande Country" of Hill (see fig. 21). To the east of the East Front Ranges, the western Texas region descends from the high plateaus bordering the Rocky ]\[ountains in northern New Mexico b}" a series of broad plains arranged in the form of a great stair (as described by Hill) to the Gulf of Mexico. The higher part of tins area constitutes ]iart of the plateau region of western United States and is bounded on the south and east hy a. Fig. L'l—The natural divisions (f:NViR()NMENTAi. complexes) of the (iREATEii Texas Region. line running from Del Rio to Austin and from here west and north to Oklahoma. To the eastward the plateaus grade down into the prairie region, whicli forms a l)r()ad band across central Texas and extends to the northward beyond the State. The climatic conditions of these regions are well illustrated b}?" the character of the vegetation. The Trans-Pecos region is a ])art of the Proplateau region of southern Arizona and New Mexico, and the conditions are very similar to those in the latter States. The rainfall is mostly below 10 inches, and the evaporation is high, which with the scanty rainfall prevents the occurrence of arboreal vegeta-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States National Museum; Smithsonian Institution; United States. Dept. of the Interior. Washington : Smithsonian Institution Press, [etc. ]; for sale by the Supt. of Docs. , U. S. Govt Print. Off.
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