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The Balcones Fault zone is made up of many smaller features, including normal faults, grabens, and horsts. [3] One of the obvious features is the Mount Bonnell Fault. [4] The location of the fault zone may be related to the Ouachita Mountains, formed 300 million years ago during a continental
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]
Shaded and colored image from the Shuttle Radar Topography Mission—shows an elevation model of New Zealand's Alpine Fault running about 500 km (300 mi) long. The escarpment is flanked by a chain of hills squeezed between the fault and the mountains of New Zealand's Southern Alps. Northeast is towards the top. Australia Great Escarpment, Australia
The area was vaguely defined and shifted over time but generally was described as bordered to the south by the Balcones Fault, just north of San Antonio, Texas, continuing north along the Cross Timbers to encompass a northern area that included the Cimarron River and the upper Arkansas River east of the Rocky Mountains.
The Salado Springs are located in the Balcones Fault zone, and they reach the surface through artesian pressure by way of faults in the Cretaceous Edwards limestone. The main recharge area for the springs is probably several miles to the southwest in Williamson County, where several faults intersect with Salado Creek.
Horizontal shortening caused flexural isostasy to bend the lithosphere. The bent lithosphere to the west of the Ouachita mountains caused a bowl-shaped depression to form, known as a foreland basin, preserving the Mississippian sediments of the Barnett Shale and other Paleozoic sediments; these sediments mostly formed before the Pangeic collision.
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.
With crustal extension, a series of normal faults which occur in groups, form in close proximity and dipping in opposite directions. [4] As the crust extends it fractures in series of fault planes, some blocks sink down due to gravity, creating long linear valleys or basins also known as grabens, while the blocks remaining up or uplifted produce mountains or ranges, also known as horsts.