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Trans-Pecos Volcanic Field
The Trans-Pecos Volcanic Field is a volcanic field located in western Texas in the counties of Brewster, Jeff Davis, Presidio, and extends into northern Mexican states of Chihuahua and Coahuila. It is the southernmost volcanic field to be documented and recorded in the continental United States. The field started volcanic activity around 48 million years ago in the middle Eocene epoch, and ended around 17 million years later in the Miocene epoch. The Volcanic field is the result of Ancient Subduction off the western portion of the continent at the time. Most of the volcanoes in the field are calderas. Some of the volcanoes are: *In Big Bend National Park, the Christmas Mountains caldera complex and Pine Canyon caldera complex *In Big Bend Ranch State Park, the Bofecitos mountains center and the Solitario *Near Alpine, the Paisano Volcano *In northern Jeff Davis County, the Davis Mountains Caldera Complex *In central Presidio County, the Chinati Mountain Caldera Complex, an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Volcanic Field
A volcanic field is an area of Earth's crust that is prone to localized volcanic activity. The type and number of volcanoes required to be called a "field" is not well-defined. Volcanic fields usually consist of clusters of up to 100 volcanoes such as cinder cones. Lava flows may also occur. They may occur as a monogenetic volcanic field or a polygenetic volcanic field. Description Alexander von Humboldt observed in 1823 that geologically young volcanoes are not distributed uniformly across the Earth's surface, but tend to be clustered into specific regions. Young volcanoes are rarely found within cratons, but are characteristic of subduction zones, rift zones, or in ocean basins. Intraplate volcanoes are clustered along hotspot traces. Within regions of volcanic activity, volcanic fields are clusters of volcanoes that share a common magma source. Scoria cones are particularly prone to cluster into volcanic fields, which are typically in diameter and consist of several t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pine Canyon Caldera Complex
The Pine Canyon Caldera Complex is a caldera complex located in Big Bend National Park of Texas. The complex is located in the southern part of the Chisos Mountains in the South Rim Formation. The caldera was formed by several rhyolitic Rhyolite ( ) is the most silica-rich of volcanic rocks. It is generally glassy or fine-grained (aphanitic) in texture, but may be porphyritic, containing larger mineral crystals (phenocrysts) in an otherwise fine-grained groundmass. The mineral ... eruptions about 32 million years ago. It is considered a downsag caldera (a type of collapsed caldera), meaning it lacks surficial faulting. The Pine Canyon Caldera also is believed to have been created from crust (geology), crustal stretching during the Ouachita orogeny. Also in the northern part of the caldera, high magnetic waves are present and are believed to be from a broad intrusion, which tends to mean a partial crustal boundary of the Ouachita orogeny. This feature represents the largest in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eocene Volcanism
The Eocene ( ) Epoch is a geological epoch that lasted from about 56 to 33.9 million years ago (mya). It is the second epoch of the Paleogene Period in the modern Cenozoic Era. The name ''Eocene'' comes from the Ancient Greek (''ēṓs'', "dawn") and (''kainós'', "new") and refers to the "dawn" of modern ('new') fauna that appeared during the epoch. The Eocene spans the time from the end of the Paleocene Epoch to the beginning of the Oligocene Epoch. The start of the Eocene is marked by a brief period in which the concentration of the carbon isotope 13C in the atmosphere was exceptionally low in comparison with the more common isotope 12C. The end is set at a major extinction event called the ''Grande Coupure'' (the "Great Break" in continuity) or the Eocene–Oligocene extinction event, which may be related to the impact of one or more large bolides in Siberia and in what is now Chesapeake Bay. As with other geologic periods, the strata that define the start and end of t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Volcanism Of Mexico
Volcanism, vulcanism or volcanicity is the phenomenon of eruption of molten rock (magma) onto the surface of the Earth or a solid-surface planet or moon, where lava, pyroclastics, and volcanic gases erupt through a break in the surface called a vent. It includes all phenomena resulting from and causing magma within the crust or mantle of the body, to rise through the crust and form volcanic rocks on the surface. Magmas, that reach the surface and solidify, form extrusive landforms. Volcanic processes Magma from the mantle or lower crust rises through the crust towards the surface. If magma reaches the surface, its behavior depends on the viscosity of the molten constituent rock. Viscous (thick) magma produces volcanoes characterised by explosive eruptions, while non-viscous (runny) magma produce volcanoes characterised by effusive eruptions pouring large amounts of lava onto the surface. In some cases, rising magma can cool and solidify without reaching the surface. Instead, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Volcanic Fields Of The United States
A volcano is a rupture in the crust of a planetary-mass object, such as Earth, that allows hot lava, volcanic ash, and gases to escape from a magma chamber below the surface. On Earth, volcanoes are most often found where tectonic plates are diverging or converging, and most are found underwater. For example, a mid-ocean ridge, such as the Mid-Atlantic Ridge, has volcanoes caused by divergent tectonic plates whereas the Pacific Ring of Fire has volcanoes caused by convergent tectonic plates. Volcanoes can also form where there is stretching and thinning of the crust's plates, such as in the East African Rift and the Wells Gray-Clearwater volcanic field and Rio Grande rift in North America. Volcanism away from plate boundaries has been postulated to arise from upwelling diapirs from the core–mantle boundary, deep in the Earth. This results in hotspot volcanism, of which the Hawaiian hotspot is an example. Volcanoes are usually not created where two tectonic plates slide pa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
United States Geological Survey
The United States Geological Survey (USGS), formerly simply known as the Geological Survey, is a scientific agency of the United States government. The scientists of the USGS study the landscape of the United States, its natural resources, and the natural hazards that threaten it. The organization's work spans the disciplines of biology, geography, geology, and hydrology. The USGS is a fact-finding research organization with no regulatory responsibility. The agency was founded on March 3, 1879. The USGS is a bureau of the United States Department of the Interior; it is that department's sole scientific agency. The USGS employs approximately 8,670 people and is headquartered in Reston, Virginia. The USGS also has major offices near Lakewood, Colorado, at the Denver Federal Center, and Menlo Park, California. The current motto of the USGS, in use since August 1997, is "science for a changing world". The agency's previous slogan, adopted on the occasion of its hundredth an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chinati Mountain Caldera Complex
The Chinati Mountains Caldera Complex is a caldera complex located primarily in the Chinati Mountains within the Trans-Pecos Volcanic Field in Texas, United States. It is the largest and most documented volcano within the Trans-Pecos Volcanic Field, consisting mostly of two calderas: the Infernito Caldera and the Chinati Mountain Caldera. The main caldera, Chinati Mountain, erupted about 32-31 million years ago which resulted in the deposition of the Mitchell Mesa Tuff. The Infernito Caldera predates the Chinati Mountains Caldera, having deposited the Infernito Tuff about 37 million years ago. It was partially destroyed by the formation of the Chinati Mountains Caldera. The main caldera, on the western side, consists primarily of thick rhyolite Rhyolite ( ) is the most silica-rich of volcanic rocks. It is generally glassy or fine-grained ( aphanitic) in texture, but may be porphyritic, containing larger mineral crystals ( phenocrysts) in an otherwise fine-grained groundmass ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Presidio County
Presidio County is a county located in the U.S. state of Texas. As of the 2020 census, its population was 6,131. Its county seat is Marfa. The county was created in 1850 and later organized in 1875. Presidio County (K-5 in Texas topological index of counties) is in the Trans-Pecos region of West Texas and is named for the border settlement of Presidio del Norte. It is on the Rio Grande, which forms the Mexican border. History Native Americans Paleo-Indians (hunter-gatherers) existed thousands of years ago on the Trans-Pecos, and often did not adapt to culture clashes, European diseases, and colonization. The Masames tribe was exterminated by the Tobosos, ''circa'' 1652. The Nonojes suffered from clashes with the Spanish and merged with the Tobosos. The Spanish made slave raids to the La Junta de los Ríos, committing cruelties against the native population. The Suma-Jumano tribe sought to align themselves with the Spanish for survival. The tribe later merged with the A ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Davis Mountains Caldera Complex
Davis may refer to: Places Antarctica * Mount Davis (Antarctica) * Davis Island (Palmer Archipelago) * Davis Valley, Queen Elizabeth Land Canada * Davis, Saskatchewan, an unincorporated community * Davis Strait, between Nunavut and Greenland * Mount Davis (British Columbia) United States * Davis, California, the largest city with the name * Davis, Illinois, a village * Davis, Massachusetts, an abandoned mining village * Davis, Maryland, a ghost town * Davis, Missouri, an unincorporated community * Davis, North Carolina, an unincorporated community and census-designated place * Davis, Oklahoma, a city * Davis, South Dakota, a town * Davis, West Virginia, a town * Davis, Logan County, West Virginia, an unincorporated community * Davis Island (Connecticut) * Davis Island (Mississippi) * Davis Island (Pennsylvania) * Davis Peak (Washington) * Fort Davis, Oklahoma * Mount Davis (California) * Mount Davis (New Hampshire) * Mount Davis (Pennsylvania) Other * Than K ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paisano Volcano
Paisano may refer to: Places in the United States Arizona * Casa Juan Paisano, a historic house in Tucson Texas * Paisano Grant, one of twenty-five land grants made in the Brooks County/Jim Wells County area * Paisano Park, Texas, a census-designated place in San Patricio County * El Paisano Hotel, a historic hotel in Marfa * El Paisano Ranch, a ranch in Jim Wells County * Edgewater-Paisano, Texas, a suburb of Mathis Other uses * ''The Paisano'', an independent student-run newspaper of the University of Texas at San Antonio * Edna Paisano (1948–2014), Nez Perce and Laguna Pueblo demographer and statistician * ''Sphodros paisano ''Sphodros paisano'' is a species of purseweb spider in the family Family (from la, familia) is a group of people related either by consanguinity (by recognized birth) or affinity (by marriage or other relationship). The purpose of the f ...'', a species of purseweb spider in the family Atypidae * '' Ue... paisano!'', a 1953 Argentine film ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alpine, Texas
Alpine ( ) is a city in and the county seat of Brewster County, Texas, United States. The population was 5,905 at the 2010 census. The town has an elevation of , and the surrounding mountain peaks are over above sea level. The university, hospital, library, and retail make Alpine the center of the sprawling but wide open Big Bend area (combined population only 12,500) including Brewster, Presidio, and Jeff Davis counties. History The area had been a campsite for cattlemen tending their herds between 1878 and the spring of 1882, when a town of tents was created by railroad workers and their families. Because the section of the railroad was called Osborne, that was the name of the small community for a brief time. The railroad needed access to water from springs owned by brothers named Daniel and Thomas Murphy, so it entered into an agreement with the Murphys to change the name of the section and settlement to Murphyville in exchange for a contract to use the spring. In Novem ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Solitario
The Solitario (''El Solitario'') is a large geologic formation in Big Bend Ranch State Park in West Texas. When viewed from above, it suggests an impact crater; though it is actually the eroded remains of a laccolith. The approximate center of the Solitario is located east southeast of Presidio, Texas, just west of the line dividing Brewster County, Texas and Presidio County, Texas. The formation covers a circular area of approximately . The geology of the Solitario is complex. In 1988 the state of Texas purchased the property containing the Solitario and created Big Bend Ranch State Park. The formation lies in the Chihuahuan Desert ecoregion of the United States. Geology The Solitario is a structural dome developed in Paleozoic and Cretaceous rocks above an Eocene granite laccolith intrusion. The dome is associated with radial rhyolite to trachyte dikes and sills and erupted ash flow tuffs. The 16 km diameter dome contains a 6 by 2 km volcanic caldera filled with co ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
