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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]
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
Edwards and Trinity Aquifers map. The Edwards Aquifer is one of the most prolific artesian aquifers in the world. [2] Located on the eastern edge of the Edwards Plateau in the U.S. state of Texas, it is the source of drinking water for two million people, and is the primary water supply for agriculture and industry in the aquifer's region.
These hills are the dissected edge of the Edwards Plateau, which consist of overlying Cretaceous sedimentary strata. Within this basin and along its margin are down-faulted blocks and erosional remnants of Paleozoic strata which form prominent hills. [1] [2] [3] The Llano Uplift is well known for its large, granite domes, such as Enchanted Rock.
The Texas Hill Country is a geographic region of Central and South Texas, forming the southeast part of the Edwards Plateau. Given its location, climate, terrain, and vegetation, the Hill Country can be considered the border between the American South and Southwest. [1]
The cave is one of an estimated 3,000 under the extensive karst landscape of the Edwards Plateau, formed by the dissolution of Edwards Group limestone by rainwater. [4] The cave, which is an estimated 40 million years old, was the second discovered in the immediate residential area: during construction of the area in 1986, a separate cave was found and dynamited by housing developers.
Inner Space Cavern lies within limestone and dolomite rocks of the Edwards Group formed during the Cretaceous period. [1] Following the formation of the Balcones Fault, a series of vertical fractures through the Edwards Formations allowed ground water to freely move through the limestone marking the beginning of the cavern's formation.
The area came about in the Cretaceous age when the Edwards Plateau was formed when a section of land was lifted 2000 feet along a curving fault. It is now located on the southwestern edge of the plateau in the sub-region Balcones Canyonlands. Today high mesas, limestone cliffs, deep canyons and clear streams fill the terrain.