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Mount Jefferson (Madison County, Montana)
Mount Jefferson is a mountain in the U.S. state of Montana, and is one of the many 10,000+ ft peaks in the Tobacco Root Mountains. The mountain is located in Beaverhead-Deerlodge National Forest. (There is also another Mount Jefferson in Montana, further south, on the Idaho/Montana border.) Hollowtop Mountain is an adjacent, taller peak less than .75 miles (1.2 km) to the north. Over the years, the two summits have had numerous names and elevations recorded on various maps. According to U.S. Geological Survey topographic maps, Mount Jefferson is , while Hollowtop Mountain to the north is . Nomenclature Nomenclature for Mount Jefferson has seen considerable change and confusion over the years. A.N. Winchell, in his 1914 report, ''Mining Districts of the Dillon Quadrangle'', referred to the highest peak in the Tobacco Roots as "Jefferson Peak, locally called Old Hollowtop." Since that time the more northerly, and higher, of two adjacent peaks has usually been called ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Madison County, Montana
Madison County is a County (United States), county in the U.S. state of Montana. As of the 2020 United States census, 2020 census, the population was 8,623. Its county seat is Virginia City, Montana, Virginia City. The county was founded in 1865; at the time it was part of the Montana Territory. Geography According to the United States Census Bureau, the county has an area of , of which is land and (0.4%) is water. Major highways * Interstate 15 in Montana, Interstate 15 * Former U.S. Highway 91 * U.S. Route 287#Montana, U.S. Highway 287 * Montana Highway 41 * Montana Highway 84 * Montana Highway 87 * Montana Highway 55 * Montana Highway 287 Adjacent counties * Beaverhead County, Montana, Beaverhead County - southwest * Silver Bow County, Montana, Silver Bow County - northwest * Jefferson County, Montana, Jefferson County - north * Gallatin County, Montana, Gallatin County - east * Fremont County, Idaho - south National protected areas * Beaverhead National Fores ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Late Cretaceous
The Late Cretaceous (100.5–66 Ma) is the younger of two epochs into which the Cretaceous Period is divided in the geologic time scale. Rock strata from this epoch form the Upper Cretaceous Series. The Cretaceous is named after ''creta'', the Latin word for the white limestone known as chalk. The chalk of northern France and the white cliffs of south-eastern England date from the Cretaceous Period. Climate During the Late Cretaceous, the climate was warmer than present, although throughout the period a cooling trend is evident. The tropics became restricted to equatorial regions and northern latitudes experienced markedly more seasonal climatic conditions. Geography Due to plate tectonics, the Americas were gradually moving westward, causing the Atlantic Ocean to expand. The Western Interior Seaway divided North America into eastern and western halves; Appalachia and Laramidia. India maintained a northward course towards Asia. In the Southern Hemisphere, Australia and Ant ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mountains Of Madison County, Montana
A mountain is an elevated portion of the Earth's crust, generally with steep sides that show significant exposed bedrock. Although definitions vary, a mountain may differ from a plateau in having a limited summit area, and is usually higher than a hill, typically rising at least 300 metres (1,000 feet) above the surrounding land. A few mountains are isolated summits, but most occur in mountain ranges. Mountains are formed through tectonic forces, erosion, or volcanism, which act on time scales of up to tens of millions of years. Once mountain building ceases, mountains are slowly leveled through the action of weathering, through slumping and other forms of mass wasting, as well as through erosion by rivers and glaciers. High elevations on mountains produce colder climates than at sea level at similar latitude. These colder climates strongly affect the ecosystems of mountains: different elevations have different plants and animals. Because of the less hospitable terrain ... [...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#Glaciology, ablation over many years, often Century, centuries. It acquires distinguishing features, such as Crevasse, crevasses and Serac, 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 lati ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ice Age
An ice age is a long period of reduction in the temperature of Earth's surface and atmosphere, resulting in the presence or expansion of continental and polar ice sheets and alpine glaciers. Earth's climate alternates between ice ages and greenhouse periods, during which there are no glaciers on the planet. Earth is currently in the Quaternary glaciation. Individual pulses of cold climate within an ice age are termed ''glacial periods'' (or, alternatively, ''glacials, glaciations, glacial stages, stadials, stades'', or colloquially, ''ice ages''), and intermittent warm periods within an ice age are called '' interglacials'' or ''interstadials''. In glaciology, ''ice age'' implies the presence of extensive ice sheets in both northern and southern hemispheres. By this definition, Earth is currently in an interglacial period—the Holocene. The amount of anthropogenic greenhouse gases emitted into Earth's oceans and atmosphere is predicted to prevent the next glacial period for th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cirque (landform)
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 down ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Harrison, Montana
Harrison is a census-designated place (CDP) in Madison County, Montana, United States. The population was 137 at the 2010 census, down from 162 in 2000. The town began as Ferguson, a stage stop on the road to Virginia City. The Northern Pacific Railroad constructed a branch line in 1889. Eventually the town was called Harrison after an early settler, Henry C. Harrison. Geography Harrison is located at (45.702507, -111.785376). U.S. Route 287 passes through town. Willow Creek Reservoir is to the east. According to the United States Census Bureau, the CDP has a total area of , all land. Demographics As of the census of 2000, there were 162 people, 64 households, and 44 families residing in the CDP. The population density was 704.9 people per square mile (272.0/km2). There were 75 housing units at an average density of 326.3 per square mile (125.9/km2). The racial makeup of the CDP was 96.91% White, 1.85% Native American, 0.62% Asian, and 0.62% from two or more races. Hispan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pony, Montana
Pony is an unincorporated community and census-designated place in northeastern Madison County, Montana, United States on the eastern edge of the Tobacco Root Mountains. It includes the Pony Historic District, a historic district with 95 contributing buildings listed on the National Register of Historic Places. with The town gained its name from the nickname of one of its early miners, Tecumseth Smith, a small man nicknamed "Pony" because of his diminutive size. Settled in the 1860s, in the late nineteenth century, Pony was a prosperous gold-mining community with at least 5,000 residents. Mining operations declined in the early 20th century and all were closed by 1922. A number of historic buildings from Pony's boom era remain in the old town today. Major buildings are managed, voluntarily, by The Pony Homecoming Club, a non-profit organization that maintains the town's public spaces. Montana Highway 283 passes through town. It is about 6 miles from Harrison Harrison may ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mining Claim
Mineral rights are property rights to exploit an area for the minerals it harbors. Mineral rights can be separate from property ownership (see Split estate). Mineral rights can refer to sedentary minerals that do not move below the Earth's surface or fluid minerals such as oil or natural gas. There are three major types of mineral property; unified estate, severed or split estate, and fractional ownership of minerals. Mineral estate Owning mineral rights (often referred to as a "mineral interest" or a "mineral estate") gives the owner the right to exploit, mine, and/or produce any or all minerals they own. Minerals can refer to oil, gas, coal, metal ores, stones, sands, or salts. An owner of mineral rights may sell, lease, or donate those minerals to any person or company as they see fit. Mineral interests can be owned by private landowners, private companies, or federal, state or local governments. Sorting these rights are a large part of mineral exploration. A brief outline ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Land Patent
A land patent is a form of letters patent assigning official ownership of a particular tract of land that has gone through various legally-prescribed processes like surveying and documentation, followed by the letter's signing, sealing, and publishing in public records, made by a sovereign entity. It is the highest evidence of right, title, and interest to a defined area. It is usually granted by a central, federal, or state government to an individual, partnership, trust, or private company. The land patent is not to be confused with a land grant. Patented lands may be lands that had been granted by a sovereign authority in return for services rendered or accompanying a title or otherwise bestowed ''gratis'', or they may be lands privately purchased by a government, individual, or legal entity from their prior owners. "Patent" is both a process and a term. As a process, it is somewhat parallel to gaining a patent for intellectual property, including the steps of uniquely def ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Metamorphic Rocks
Metamorphic rocks arise from the transformation of existing rock to new types of rock in a process called metamorphism. The original rock (protolith) is subjected to temperatures greater than and, often, elevated pressure of or more, causing profound physical or chemical changes. During this process, the rock remains mostly in the solid state, but gradually recrystallizes to a new texture or mineral composition. The protolith may be an igneous, sedimentary, or existing metamorphic rock. Metamorphic rocks make up a large part of the Earth's crust and form 12% of the Earth's land surface. They are classified by their protolith, their chemical and mineral makeup, and their texture. They may be formed simply by being deeply buried beneath the Earth's surface, where they are subject to high temperatures and the great pressure of the rock layers above. They can also form from tectonic processes such as continental collisions, which cause horizontal pressure, friction, and distort ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Archean
The Archean Eon ( , also spelled Archaean or Archæan) is the second of four geologic eons of Earth's history, representing the time from . The Archean was preceded by the Hadean Eon and followed by the Proterozoic. The Earth Earth is the third planet from the Sun and the only astronomical object known to harbor life. While large volumes of water can be found throughout the Solar System, only Earth sustains liquid surface water. About 71% of Earth's surfa ... during the Archean was mostly a water world: there was continental crust, but much of it was under an ocean deeper than today's ocean. Except for some trace minerals, today's oldest continental crust dates back to the Archean. Much of the geological detail of the Archean has been destroyed by subsequent activity. The Earliest known life forms, earliest known life started in the Archean. Life was simple throughout the Archean, mostly represented by shallow-water microbial mats called stromatolites, and the a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
