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Black Canyon Of The Gunnison National Park
Black Canyon of the Gunnison National Park is a List of national parks of the United States, national park of the United States located in western Colorado and managed by the National Park Service. The Black Canyon of the Gunnison was established as a national monument on March 2, 1933. It was redesignated a national park on October 21, 1999, and incorporated 4,000 acres owned by the Bureau of Land Management. The Gunnison Gorge National Conservation Area was created at the same time. There are two primary entrances to the park: the south rim entrance is located east of Montrose, Colorado, Montrose, while the north rim entrance is south of Crawford, Colorado, Crawford and is closed in the winter. The park contains of the Gunnison River. The national park itself contains the deepest and most dramatic section of the canyon, but the canyon continues upstream into Curecanti National Recreation Area and downstream into Gunnison Gorge National Conservation Area. The canyon's name o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Montrose County, Colorado
Montrose County is a county located in the U.S. state of Colorado. As of the 2020 United States census, 2020 census, the population was 42,679. The county seat is Montrose, Colorado, Montrose, for which the county is named. Montrose County comprises the Montrose, CO, Micropolitan Statistical Area. Geography According to the U.S. Census Bureau, the county has a total area of , of which is land and (0.08%) is water. Adjacent counties * Mesa County, Colorado, Mesa County - north * Delta County, Colorado, Delta County - northeast * Gunnison County, Colorado, Gunnison County - east * Ouray County, Colorado, Ouray County - southeast * San Miguel County, Colorado, San Miguel County - south * San Juan County, Utah, San Juan County, Utah - west Major highways * U.S. Highway 50 (Colorado), U.S. Highway 50 * U.S. Highway 550 (Colorado), U.S. Highway 550 * Colorado State Highway 90, State Highway 90 * Colorado State Highway 92, State Highway 92 * Colorado State Highway 141, State ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Schist
Schist ( ) is a medium-grained metamorphic rock generally derived from fine-grained sedimentary rock, like shale. It shows pronounced ''schistosity'' (named for the rock). This means that the rock is composed of mineral grains easily seen with a low-power hand lens, oriented in such a way that the rock is easily split into thin flakes or plates. This texture (geology), texture reflects a high content of platy minerals, such as mica, talc, chlorite group, chlorite, or graphite. These are often interleaved with more granular minerals, such as feldspar or quartz. Schist typically forms during regional metamorphism accompanying the process of mountain building (orogeny) and usually reflects a medium Metamorphism#Metamorphic grades, grade of metamorphism. Schist can form from many different kinds of rocks, including sedimentary rocks such as mudstones and igneous rocks such as tuffs. Schist metamorphosed from mudstone is particularly common and is often very rich in mica (a ''mica schis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Turbidity
Turbidity is the cloudiness or haziness of a fluid caused by large numbers of individual particles that are generally invisible to the naked eye, similar to smoke in air. The measurement of turbidity is a key test of both water clarity and water quality. Fluids can contain suspended solid matter consisting of particles of many different sizes. While some suspended material will be large enough and heavy enough to settle rapidly to the bottom of the container if a liquid sample is left to stand (the settable solids), very small particles will settle only very slowly or not at all if the sample is regularly agitated or the particles are colloidal. These small solid particles cause the liquid to appear turbid. Turbidity (or haze) is also applied to transparent solids such as glass or plastic. In plastic production, haze is defined as the percentage of light that is deflected more than 2.5° from the incoming light direction. Causes and effects Turbidity in open water may be ca ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sawatch Range
The Sawatch Range or Saguache RangeThe place name "Saguache” is pronounced “Sawatch” . This name derives from the Ute language noun "''sawup''" meaning "sand dunes" and is spelled using the Spanish language version of this name "Saguache".''Merriam-Webster's Geographical Dictionary'', Third Edition (1997), p. 1060 s.v. Sawatch Range. is a high and extensive mountain range in central Colorado which includes eight of the twenty highest peaks in the Rocky Mountains, including Mount Elbert, at elevation, the highest peak in the Rockies. The range is oriented along a northwest–southeast axis, extending roughly from in the north to in the south. The range contains fifteen peaks in excess of , also known as fourteeners. The range forms a part of the Continental Divide, and its eastern side drains into the headwaters of the Arkansas River. The western side of the range feeds the headwaters of the Roaring Fork River, the Eagle River, and the Gunnison River, tributaries ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Volcanic Ash
Volcanic ash consists of fragments of rock, mineral crystals, and volcanic glass, produced during volcanic eruptions and measuring less than 2 mm (0.079 inches) in diameter. The term volcanic ash is also often loosely used to refer to all explosive eruption products (correctly referred to as '' tephra''), including particles larger than 2 mm. Volcanic ash is formed during explosive volcanic eruptions when dissolved gases in magma expand and escape violently into the atmosphere. The force of the gases shatters the magma and propels it into the atmosphere where it solidifies into fragments of volcanic rock and glass. Ash is also produced when magma comes into contact with water during phreatomagmatic eruptions, causing the water to explosively flash to steam leading to shattering of magma. Once in the air, ash is transported by wind up to thousands of kilometres away. Due to its wide dispersal, ash can have a number of impacts on society, including animal a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Abajo Mountains
The Abajo Mountains, sometimes referred to as the Blue Mountains, are a small mountain range west of Monticello, Utah, south of Canyonlands National Park and north of Blanding, Utah. The mountain range is located within the Manti–La Sal National Forest. The highest point within the range is Abajo Peak at . This mountain range, like both the La Sal Range and Henry Mountains in the same part of the Colorado Plateau, is formed about igneous intrusions that are relatively resistant to erosion. Some of these intrusions form laccoliths emplaced at depths of a few kilometers. The predominant igneous rock is porphyritic hornblende diorite. Ages of intrusion in the Abajo Mountains fall in the interval from 22 to 29 million years. These mountain ranges are part of the Colorado Plateau province west of the greater ranges of the Rocky Mountains The Rocky Mountains, also known as the Rockies, are a major mountain range and the largest mountain system in North America. The Rocky M ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Henry Mountains
The Henry Mountains is a mountain range located in the southeastern portion of the U.S. state of Utah that runs in a generally north-south direction, extending over a distance of about . They were named by Almon Thompson in honor of Joseph Henry, the first secretary of the Smithsonian Institution. The nearest towns are Bicknell, Torrey, and Hanksville, which is north of the mountains. The Henry Mountains were the last mountain range to be added to the map of the 48 contiguous U.S. states (1872), and before their official naming by Thompson were sometimes referred to as the "Unknown Mountains." In Navajo, the range is still referred to as ''Dził Bizhiʼ Ádiní'' ("mountain whose name is missing"). Most lands within the Henry Mountains are federally owned, public lands administered by the U.S. Bureau of Land Management. A herd of 350 American Bison roams freely in the Henrys. Geography and geology The range is clustered into two main groups, with Highway 276 dividing the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
La Sal Range
The La Sal Mountains or La Sal Range is a mountain range located in Grand and San Juan counties in the U.S. state of Utah, along the border with Colorado. The range rises above and southeast of Moab and north of the town of La Sal. This range is part of the Manti-La Sal National Forest and the southern Rocky Mountains. The maximum elevation is at Mount Peale, reaching above sea level. The range contains three clusters of peaks separated by passes. The peaks span a distance of about . The name of the range dates to Spanish times, when the Sierra La Sal (meaning the "Salt Mountains") was a prominent landmark on the Old Spanish Trail between Santa Fe and Los Angeles. Geology The range formed due to intrusion of igneous rocks and subsequent erosion of the surrounding less-resistant sedimentary rocks. The most abundant igneous rocks are porphyritic, with phenocrysts of hornblende and plagioclase: these rocks are called diorite in some accounts, but trachyte in at least one other ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
West Elk Mountains
The West Elk Mountains are a high mountain range in the west-central part of the U.S. state of Colorado. They lie primarily within the Gunnison National Forest, and part of the range is protected as the West Elk Wilderness. The range is primarily located in Gunnison County, with small parts in eastern Delta and Montrose counties. The West Elks are surrounded by tributaries of the Gunnison River. The range is bounded on the north by the North Fork of the Gunnison and on the east by the East River, another tributary of the Gunnison. On the south and west it is contiguous with Black Mesa and Fruitland Mesa, both part of the uplift in which sits the Black Canyon of the Gunnison. On the northeast it is contiguous with the Elk Mountains, being separated from them by Anthracite Creek and Coal Creek. Nearby towns include Gunnison, Paonia, and the ski resort of Crested Butte. Geology The northern and southern West Elk Mountains have contrasting geologic histories and surface fea ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Volcanism
Volcanism, vulcanism, volcanicity, or volcanic activity is the phenomenon where solids, liquids, gases, and their mixtures erupt to the surface of a solid-surface astronomical body such as a planet or a moon. It is caused by the presence of a heat source, usually internally generated, inside the body; the heat is generated by various processes, such as radioactive decay or tidal heating. This heat partially melts solid material in the body or turns material into gas. The mobilized material rises through the body's interior and may break through the solid surface. Causes For volcanism to occur, the temperature of the mantle must have risen to about half its melting point. At this point, the mantle's viscosity will have dropped to about 1021 Pascal-seconds. When large scale melting occurs, the viscosity rapidly falls to 103 Pascal-seconds or even less, increasing the heat transport rate a million-fold. The occurrence of volcanism is partially due to the fact that melted materi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tertiary Period
The Tertiary ( ) is an obsolete Period (geology), geologic period spanning 66 million to 2.6 or 1.8 million years ago. The period began with the extinction of the non-bird, avian dinosaurs in the Cretaceous–Paleogene extinction event, at the start of the Cenozoic, Cenozoic Era, and extended to the beginning of the Quaternary glaciation at the end of the Pliocene, Pliocene Epoch. The Tertiary has not been recognised by the International Commission on Stratigraphy (ICS) since the late 1980s, with the timespan of the Tertiary now being split in to the earlier Paleogene and the more recent Neogene periods, though the Tertiary continues to be used in some scientific publications. Historical use of the term The term Tertiary was first used by Giovanni Arduino (geologist), Giovanni Arduino during the mid-18th century. He classified geologic time into primitive (or primary), secondary, and tertiary periods based on observations of geology in Northern Italy. Later a fourth period, t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Laramide Orogeny
The Laramide orogeny was a time period of mountain building in western North America, which started in the Late Cretaceous, 80 to 70 million years ago, and ended 55 to 35 million years ago. The exact duration and ages of beginning and end of the orogeny are in dispute. The Laramide orogeny occurred in a series of pulses, with quiescent phases intervening. The major feature that was created by this orogeny was deep-seated, thick-skinned deformation, with evidence of this orogeny found from Canada to northern Mexico, with the easternmost extent of the mountain-building represented by the Black Hills of South Dakota. The phenomenon is named for the Laramie Mountains of eastern Wyoming. The Laramide orogeny is sometimes confused with the Sevier orogeny, which partially overlapped in time and space. The orogeny is commonly attributed to events off the west coast of North America, where the Kula and Farallon Plates were sliding under the North American Plate. Most hypotheses propo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
