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Calf Creek Plateau
Calf Creek Plateau is a mountain in the northern San Juan Mountains of the Rocky Mountains of North America. The mountain is located in Hinsdale County, and at an elevation of , it is the high point of the Powderhorn Wilderness. Geology Calf Creek Plateau is within the San Juan volcanic field and volcanic rocks dominate the region. The mountain itself is composed of basaltic lava flows of the Hinsdale Formation, which are dated as 16 to 19 million years old. These lava flows are thought to be among the last volcanic events in the area and are some of the best preserved. The Hinsdale Formation lava flows form an expansive alpine highland where the two highest ridges are Calf Creek Plateau and nearby Cannibal Plateau. Calf Creek Plateau was glaciated, and the most prominent glacial cirque A (; from the Latin word ') is an amphitheatre-like valley formed by glacial erosion. Alternative names for this landform are corrie (from Scottish Gaelic , meaning a pot or cauldron) ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
San Juan Mountains
The San Juan Mountains is a high and rugged mountain range in the Rocky Mountains in southwestern Colorado and northwestern New Mexico. The area is highly mineralized (the Colorado Mineral Belt) and figured in the gold and silver mining industry of early Colorado. Major towns, all old mining camps, include Creede, Lake City, Silverton, Ouray, and Telluride. Large scale mining has ended in the region, although independent prospectors still work claims throughout the range. The last large scale mines were the Sunnyside Mine near Silverton, which operated until late in the 20th century and the Idarado Mine on Red Mountain Pass that closed down in the 1970s. Famous old San Juan mines include the Camp Bird and Smuggler Union mines, both located between Telluride and Ouray. The Summitville mine was the scene of a major environmental disaster in the 1990s when the liner of a cyanide-laced tailing pond began leaking heavily. Summitville is in the Summitville caldera, one of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
San Juan Volcanic Field
The San Juan volcanic field is part of the San Juan Mountains in southwestern Colorado. It consists mainly of volcanic rocks that form the largest remnant of a major composite volcanic field that covered most of the southern Rocky Mountains in the Middle Tertiary geologic time.Steven, Thomas A.; Lipman, Peter W. (1976)"Calderas of the San Juan Volcanic Field, Southwestern Colorado" ''U.S. Geological Survey Professional Papers''. Washington, DC: U.S. Government Printing Office. 958: 1–35. Retrieved 2012-05-16. There are approximately fifteen calderas known in the San Juan Volcanic Fields; however, it is possible that there are two or even three more in the region. The region began with many composite volcanoes that became active between 35 and 40 million years ago, with peak activity in the time period around 35-30 million years ago. Around this time the activity began to include explosive ash-flow eruptions. Many of these volcanoes experienced caldera collapse, resulting in th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Calf Creek Plateau, Powderhorn Wilderness, Hinsdale County, Colorado, USA 01
Calf most often refers to: * Calf (animal), the young of domestic cattle. * Calf (leg), in humans (and other primates), the back portion of the lower leg Calf or calves may also refer to: Biology and animal byproducts *Veal, meat from calves *Calfskin, leather * Vellum, calf hide processed as a writing material * Calf-binding, a leather book binding Geography *The Calf, a peak in the Yorkshire Dales, UK *Calf, an island off Newfoundland; see Bull, Cow and Calf *Calf, the product of Ice calving * Calves, Portugal, a hamlet in Póvoa de Varzim, Portugal People *Anthony Calf Other *CALF, the Common Affordable Lightweight Fighter project resulting in the Boeing X-32 *Calf, short for calfdozer, a type of small bulldozer *Calf, part of an early type of internal combustion engine seen in the Ascot (1904 automobile) See also * * List of animal names, for animals whose young are called "calves" *Crus, the entire lower leg *Calve (other) *Calving (other) *Calf I ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cirque
A (; from the Latin word ') is an amphitheatre-like valley formed by glacial erosion. Alternative names for this landform are corrie (from Scottish Gaelic , meaning a pot or cauldron) and (; ). A cirque may also be a similarly shaped landform arising from fluvial erosion. The concave shape of a glacial cirque is open on the downhill side, while the cupped section is generally steep. Cliff-like slopes, down which ice and glaciated debris combine and converge, form the three or more higher sides. The floor of the cirque ends up bowl-shaped, as it is the complex convergence zone of combining ice flows from multiple directions and their accompanying rock burdens. Hence, it experiences somewhat greater erosion forces and is most often overdeepened below the level of the cirque's low-side outlet (stage) and its down-slope (backstage) valley. If the cirque is subject to seasonal melting, the floor of the cirque most often forms a tarn (small lake) behind a dam, which marks the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Glacier
A glacier (; ) is a persistent body of dense ice that is constantly moving under its own weight. A glacier forms where the accumulation of snow exceeds its ablation over many years, often centuries. It acquires distinguishing features, such as crevasses and seracs, as it slowly flows and deforms under stresses induced by its weight. As it moves, it abrades rock and debris from its substrate to create landforms such as cirques, moraines, or fjords. Although a glacier may flow into a body of water, it forms only on land and is distinct from the much thinner sea ice and lake ice that form on the surface of bodies of water. On Earth, 99% of glacial ice is contained within vast ice sheets (also known as "continental glaciers") in the polar regions, but glaciers may be found in mountain ranges on every continent other than the Australian mainland, including Oceania's high-latitude oceanic island countries such as New Zealand. Between latitudes 35°N and 35°S, glaciers occur ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cannibal Plateau
Cannibal Plateau is a summit in Hinsdale County, Colorado in the United States. The broad mountain is located in the San Juan Mountains and within the Powderhorn Wilderness, a protected area managed by the Bureau of Land Management Gunnison Field Office and the Gunnison National Forest. Cannibal Plateau was named after an incident of cannibalism by Alferd Packer. The massacre site is near Lake City, southwest of the plateau. Geology Cannibal Plateau is composed of basaltic lava flows of the Hinsdale Formation, which are dated as 16 to 19 million years old. These lava flows are thought to be among the last volcanic events within the San Juan volcanic field and are therefore some of the best preserved. The Hinsdale Formation lava flows form an expansive alpine highland where the two highest ridges are Cannibal Plateau and nearby Calf Creek Plateau Calf Creek Plateau is a mountain in the northern San Juan Mountains of the Rocky Mountains of North America. The mountain ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hinsdale Formation
The Hinsdale Formation is a geologic formation exposed in southwestern Colorado and northern New Mexico. It has a radiometric age of 4.4 to 26.8 million years, corresponding to the Neogene period. Description The Hinsdale Formation is a bimodal volcanic formation, containing silica-poor olivine basalt and high-silica rhyolite with only small quantities of volcanic rock of intermediate composition. The sequence reflects assimilation and fractional crystallization (AFC) of a primitive basalt magma. Total thickness is in excess of . The formation is the youngest volcanic formation of the San Juan volcanic field, and is separated from older units by a significant erosional surface. Radiometric ages range from 4.4 to 26.8 million years. The formation once formed an extensive thin veneer over the San Juan volcanic field before itself being eroded. The change to bimodal association coincided with the transition from Laramide compression to Rio Grande rift extension, a pattern seen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mafic
A mafic mineral or rock is a silicate mineral or igneous rock rich in magnesium and iron. Most mafic minerals are dark in color, and common rock-forming mafic minerals include olivine, pyroxene, amphibole, and biotite. Common mafic rocks include basalt, diabase and gabbro. Mafic rocks often also contain calcium-rich varieties of plagioclase feldspar. Mafic materials can also be described as ferromagnesian. History The term ''mafic'' is a portmanteau of "magnesium" and "ferric" and was coined by Charles Whitman Cross, Joseph P. Iddings, Louis Valentine Pirsson, and Henry Stephens Washington in 1912. Cross' group had previously divided the major rock-forming minerals found in igneous rocks into ''salic'' minerals, such as quartz, feldspars, or feldspathoids, and ''femic'' minerals, such as olivine and pyroxene. However, micas and aluminium-rich amphiboles were excluded, while some calcium minerals containing little iron or magnesium, such as wollastonite or apatite, were incl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Powderhorn Wilderness
The Powderhorn Wilderness is a wilderness area in Hinsdale and Gunnison counties, Colorado, United States, located northeast of Lake City. Description Most of the northern part of the wilderness area, , about 77.5%, is located on Bureau of Land Management land and its southern portion, , about 22.5%, is located within the Gunnison National Forest. Elevations in the wilderness range from at the West Fork Powderhorn Creek to at the summit of Calf Creek Plateau. The Powderhorn Wilderness is an important watershed for the Gunnison River. The area protects the East, Middle, and West forks of Powderhorn Creek, which flow into Cebolla Creek and then the Gunnison River. Calf Creek, which is on National Forest land, flows south and eventually joins Cebolla Creek. Within the wilderness area there are numerous small lakes and beaver ponds. The largest of these are Devil's Lake and Powderhorn Lake. Much of the area sits above timberline at and it is recognized as one of the lar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hinsdale County, Colorado
Hinsdale County is a county located in the U.S. state of Colorado. As of the 2020 census, the population was 788, making it the second-least populous county in Colorado. With a population density of only , it is also the least-densely populated county in Colorado. The county seat and only incorporated municipality in the county is Lake City. The county is named for George A. Hinsdale, a prominent pioneer and former Lieut. Governor of Colorado Territory. Geography According to the U.S. Census Bureau, the county has a total area of , of which is land and (0.5%) is water. Hinsdale County is one of the most remote counties in Colorado and the United States. The county is covered by mountains, including multiple fourteeners, and contains one of the largest roadless areas in the country. The continental divide crosses the county twice. Most of the county is divided among several different national forests and the Weminuche Wilderness area. Adjacent counties * Gunnison – nort ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
North America
North America is a continent in the Northern Hemisphere and almost entirely within the Western Hemisphere. It is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the southeast by South America and the Caribbean Sea, and to the west and south by the Pacific Ocean. Because it is on the North American Plate, North American Tectonic Plate, Greenland is included as a part of North America geographically. North America covers an area of about , about 16.5% of Earth's land area and about 4.8% of its total surface. North America is the third-largest continent by area, following Asia and Africa, and the list of continents and continental subregions by population, fourth by population after Asia, Africa, and Europe. In 2013, its population was estimated at nearly 579 million people in List of sovereign states and dependent territories in North America, 23 independent states, or about 7.5% of the world's population. In Americas (terminology)#Human ge ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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 Mountains stretch in straight-line distance from the northernmost part of western Canada, to New Mexico in the southwestern United States. Depending on differing definitions between Canada and the U.S., its northern terminus is located either in northern British Columbia's Terminal Range south of the Liard River and east of the Trench, or in the northeastern foothills of the Brooks Range/ British Mountains that face the Beaufort Sea coasts between the Canning River and the Firth River across the Alaska- Yukon border. Its southernmost point is near the Albuquerque area adjacent to the Rio Grande rift and north of the Sandia–Manzano Mountain Range. Being the easternmost portion of the North American Cordillera, the Rockies are distinct from the tectonically younger Cascade Range and Sierra Nevada, which both lie farther to its west. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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