|
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 The 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 the two adjacent peaks has usually be ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Madison County, Montana
Madison County is a county in the U.S. state of Montana. As of the 2020 census, the population was 8,623. Its county seat is 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 * U.S. Highway 91 * U.S. Highway 287 * Montana Highway 41 * Montana Highway 84 * Montana Highway 87 * Montana Highway 55 * Montana Highway 287 Adjacent counties * Beaverhead County - southwest * Silver Bow County - northwest * Jefferson County - north * Gallatin County - east * Fremont County, Idaho - south National protected areas * Beaverhead National Forest (part) * Deerlodge National Forest (part) * Gallatin National Forest (part) Politics In presidential elections, Madison County has historically voted predominantly Republican, with Franklin D. Roosevelt the only Democrat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Late Cretaceous
The Late Cretaceous (100.5–66 Ma) is the more recent 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, Aus ... [...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 above the surrounding land. A few mountains are inselberg, isolated summits, but most occur in mountain ranges. mountain formation, Mountains are formed through tectonic plate, 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 Slump (geology), slumping and other forms of mass wasting, as well as through erosion by rivers and glaciers. High elevations on mountains produce Alpine climate, colder climates than at sea level at similar latitude. These colder climates strongly affect the Montane ecosystems, ecosystems of mountains: different elevations hav ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Glacier
A glacier (; or ) is a persistent body of dense ice, a form of rock, that is constantly moving downhill 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“Glacier, N., Pronunciation.” Oxford English Dictionary, Oxford UP, June 2024, https://doi.org/10.1093/OED/7553486115. Accessed 25 Jan. 2025. 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 ever ... [...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 ice age called Quaternary glaciation. Individual pulses of cold climate within an ice age are termed '' glacial periods'' (''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, the term ''ice age'' is defined by the presence of extensive ice sheets in the northern and southern hemispheres. By this definition, the current Holocene epoch is an interglacial period of an ice age. The accumulation of anthropogenic greenhouse gases is projected to delay the next glacial period. History of research ... [...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 , 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 downstream limit of the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Harrison, Montana
Harrison is an Unincorporated area#United States, unincorporated community and census-designated place (CDP) in Madison County, Montana, Madison County, Montana, United States. The population was 105 at the 2020 United States census, 2020 census, down from 137 in 2010 United States census, 2010. The town began as "Ferguson", a stage stop on the road to Virginia City, Montana, 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 in northeastern Madison County and U.S. Route 287 in Montana, U.S. Route 287 passes through town, leading northeast to Three Forks, Montana, Three Forks and south to Ennis, Montana, Ennis. Willow Creek Reservoir (Montana), Willow Creek Reservoir is to the east. According to the U.S. Census Bureau, the Harrison CDP has an area of , all land. The community sits between North Willow Creek and South Willow Creek, which ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pony, Montana
Pony is an Unincorporated area, unincorporated community and census-designated place in northeastern Madison County, Montana, Madison County, Montana, United States, on the eastern edge of the Tobacco Root Mountains. As of the 2020 United States census, 2020 census, it had a population of 127. It includes the Pony Historic District, a Historic district (United States), historic district with 95 contributing buildings listed on the National Register of Historic Places. with History The town gained its name from one of its early miners, Tecumseth Smith, a man nicknamed "Pony" because of his diminutive size. Settled in the 1860s, Pony was a prosperous gold-mining community in the late nineteenth century, 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-pr ... [...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, 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 of ... [...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. While land patents are still issued by governments to indicate property is privately held, they are also often used by sovereign citizens and similar groups in illegitimate attempts to gain unlawful possession of property, or avoid taxes and foreclosure. Land patents are the 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 priv ... [...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 dis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Archean
The Archean ( , also spelled Archaean or Archæan), in older sources sometimes called the Archaeozoic, is the second of the four geologic eons of Earth's history of Earth, history, preceded by the Hadean Eon and followed by the Proterozoic and the Phanerozoic. The Archean represents the time period from (million years ago). The Late Heavy Bombardment is hypothesized to overlap with the beginning of the Archean. The Huronian glaciation occurred at the end of the eon. The Earth during the Archean was mostly a ocean world, water world: there was continental crust, but much of it was under an ocean deeper than today's oceans. Except for some rare Relict (geology), relict crystals, 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 Earth's atmosphere was also vastly different in atmospheric chemistry, composition from today's: the prebiotic atmosphere was a reducing atmosphere rich in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
