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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 Trans-Pecos is a region of extremes, and at the opposite extreme from sparsely populated Terrell County is El Paso County, which is the smallest but most populated of the nine counties. El Paso County has a land area of only 1,015 sq mi (2,629 km 2 ), yet it has a population of 800,647 individuals, resulting in a population density of 789 ...
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.
Geology of Carlsbad Caverns National Park, US: National Park Service, archived from the original on 2005-03-07; Localities of the Permian: Glass Mountains, Texas, Berkeley. Hill, Overview of the Geologic History of the Guadalupe Mountains, New Mexico , vol. 62, Caves. Permian Basin Province (PDF), USGS, archived from the original (PDF) on 2004 ...
"Cathedral Mountain Formation" [Lexicon of Geologic Names of the United States for 1961-1967: Geological Survey Bulletin 1350] (PDF). United States Geological Survey. United States Government Printing Office. p. 129. doi:10.3133/b1350. "Permian Rock Units in the Glass Mountains, West Texas". National Geologic Map Database. United States ...
Escarpment formed by the Balcones Fault at Mount Bonnell Balcones Fault Trend and affected counties Geologic map of the Balcones, and the Mexia-Talco-Luling Fault Trends, where black lines are faults, the blue shaded area is the Claiborne Group, yellow is the Jackson Group, and tan is the Wilcox Group
The Sierra Vieja is a small mountain range in the Trans-Pecos region of West Texas, 42 miles northwest of the city of Marfa in far western Jeff Davis County and northwestern Presidio County. The range extends 16 miles south, from just east of the Van Horn Mountains. [ 1 ]