The Tectonic Map of Texas distinguishes three principal tectonic cycles: (1) Precambrian cycles are recorded in the ancient rocks of the Llano region and near Van Horn and El Paso. Not shown is the thin veneer of younger Cretaceous, Tertiary, and Quaternary deposits that lie at the surface over much of the area. It also functions as the State Geological Survey, a quasi-State agency, and the Bureau Director serves as the State Geologist. Proper appreciation of regional and global deformation comes only from seeing our planet as a fluid overlain by a thin, brittle crust. Although Earth's rocky face seems solid and stationary, it is made of plates that move over millennia because of flow of rocks far below Earth's surface. Page Contact Information: Personnel Page Last Modified: Wed 15 Jan 2020 07:59:28 AM MST, University of Texas at Austin, Bureau of Economic Geology, National Cooperative Geologic Mapping Program. Title: Tectonic map of Texas Author(s): Ewing, T.E., Budnik, R.T., Ames, J.T., Ridner, D.M., and Dillon, R.L. This event is part of widespread deformation in the western United States, Canada and Mexico that created the Rocky Mountains. GitHub Sheet names are labeled on the map. Texans who have handled rock samples recovered from the state's deep petroleum and geothermal wells know that such rocks can be nearly too hot to touch. TECTONIC FRONT TECTONIC MAP OF TEXAS 1997 BUREAU OF ECONOMIC GEOLOGY THE UNIVERSITY OF TEXAS AT AUSTIN University Station, Box X Austin, Texas 78713-8924 (512) 471-1534 L p pCi Cm PALO DURO G U L F O F M E X I C O Coastal SAN MARCOS ARCH HOUS T ON EMB A YMENT <-4 0 0 50 100 150 200 miles 100 200 300 kilometers. In contrast to the complicated color pattern of the geologic map, the Tectonic Map of Texas has a simple color pattern that depicts basic map elements, called tectonostratigraphic units. Our understanding of past movements is summarized on tectonic maps, such as this Tectonic Map of Texas. These maps have elaborate color patterns because their purpose is to depict many distinctive rock formations. A list of publications is available on request. Twitter With this map as a guide, map users can retrace the experience of Texas in Earth's history of regional and global movement. For example, in West Texas darker shades of blue mark the deep West Texas and Anadarko Basins. This cycle closed with the collision of South and North America which caused the Ouachita mountain-building event, ending about 245 mya. The Bureau of Economic Geology, established in 1909 as the successor to the Texas Geological Survey and the Texas Mineral Survey, is a research entity of The University of Texas at Austin. Tectonic maps help illustrate Earth's restless history by highlighting the major episodes of plate tectonic motion, including mountain building and ocean formation. (2) The Paleozoic Ouachitan cycle began with continental rifting about 550 mya, followed by inundation of much of Texas by shallow seas. Browse related items Start at call number: G4031 .C55 1990 .U5 NEQUADRANT G4031 .C55 1990 .U5 NWQUADRANT G4031 .C55 1990 .U5 SEQUADRANT Well after this ocean began to open in South and East Texas, between 85 and 50 mya (Late Cretaceous to Paleocene), a mountain-building event called the Laramide Orogeny occurred in West Texas. Yet over long periods of time -- millions of years -- parts of Earth's surface can move tens of thousands of miles relative to other parts. Rocks shown in green and brown (Gulf Coast Cretaceous and Tertiary strata), mainly east of Dallas, Austin, and San Antonio, were deposited during the creation of the Gulf of Mexico and Atlantic Ocean. At the close of this cycle, parts of present-day Texas were attached to rocks that now are located in Antarctica and southwest Australia. To better understand the uses of these maps, compare this Tectonic Map of Texas with the Bureau of Economic Geology's page-size Geology of Texas map. At greater depth, temperatures are higher still. Of these the best known is the Llano cycle of between 1,200 and 1,080 million years ago (mya). Each cycle produced tectonostratigraphic units that record initially the generation of rifts and divergent continental margins, followed by destruction of an ocean basin and mountain building (orogeny). Geologic maps show where rock strata (layers) occur at Earth's surface or under a thin veneer of soil and vegetation. Flickr Privacy On the Tectonic Map of Texas, for example, the various Paleozoic formations between Midland, Dallas, and Amarillo have been combined. These are informally listed on this map as "tectonic episodes," but they are actually local subdivisions of global plate movements that did not begin or end everywhere at the same time, and which -- to a certain extent -- are arbitrary milestones in a continuous history of movement. Byproducts of basin formation depicted on the map include normal faults and intrusions of mobile salt (salt diapirs). Accessibility The Ouachitan mountain belt lay south and east of the Ouachita tectonic front. Structural information taken from records of deep wells is illustrated on the tectonic map by color coding that shows depth to a particular formation chosen as a reference horizon. YouTube The term foreland signifies that the paleophysiography and structure of this area were shaped by a nearby mountain belt. For example, the blue patterns of Paleozoic basins and uplifts in West Texas are crosscut by the light green of the younger Gulf Coast Basin east of San Antonio, Austin, and Dallas. Data Source: Geologic Database of Texas.
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