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Shaded relief map of the Llano Estacado. Texas contains a wide variety of geologic settings. The state's stratigraphy has been largely influenced by marine transgressive-regressive cycles during the Phanerozoic, with a lesser but still significant contribution from late Cenozoic tectonic activity, as well as the remnants of a Paleozoic mountain range.
The Red Beds of Texas and Oklahoma are a group of Early Permian-age geologic strata in the southwestern United States cropping out in north-central Texas and south-central Oklahoma. They comprise several stratigraphic groups , including the Clear Fork Group , the Wichita Group , and the Pease River Group . [ 1 ]
West Texas is often subdivided according to distinct physiographic features. The portion of West Texas that lies west of the Pecos River is often called "Far West Texas" or the "Trans-Pecos", a term introduced in 1887 by geologist Robert T. Hill. [4] The Trans-Pecos lies within the Chihuahuan Desert and is the aridest part of the state.
The Edwards Plateau is a geographic region forming the crossroads of Central, South and West Texas, United States.It is named in honor of Haden Edwards. [2] It is bounded by the Balcones Fault to the south and east; the Llano Uplift and the Llano Estacado to the north; and the Pecos River and Chihuahuan Desert to the west. [3]
The escarpment's features formed by erosion from rivers and streams, creating arroyos and highly diverse terrain, including the large Palo Duro Canyon southeast of Amarillo, Texas. [1] One will notice the change in elevation of several hundred feet while crossing the Caprock Escarpment on Interstate 40 between Adrian, Texas and San Jon, New Mexico.
The Basin and Range Province is in West Texas, west of the Pecos River, beginning with the Davis Mountains on the east and the Rio Grande to its west and south. The Trans-Pecos region is the only part of Texas regarded as mountainous and includes seven named peaks in elevation greater than 8,000 feet (2,400 m).
The Centers for Disease Control and Prevention: West South Central The Federal Emergency Management Administration : No set region but grouped with Arkansas, Louisiana, New Mexico and Oklahoma U.S ...
The Palo Duro basin is centered in the southern Texas Panhandle. It is bounded on the north by the Amarillo Uplift and other structures that separate it from the Anadarko Basin. To the south, it is bounded by the Matador Arch. Its east and west margins are defined by broad structural divides. [2]