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Armorican Massif
The Armorican Massif (, ) is a geologic massif that covers a large area in the northwest of France, including Brittany, the western part of Normandy and the Pays de la Loire. It is important because it is connected to Dover on the British side of the English Channel and there has been tilting back and forth that has controlled the geography on both sides. Its name comes from the old Armorica, a Gauls, Gaul area between the rivers Loire and Seine. The massif is composed of metamorphic rock, metamorphic and magmatic rocks that were metamorphism, metamorphosed and/or Deformation (geology), deformed during the Variscan orogeny, Hercynian or Variscan orogeny (400 to 280 million years ago) and the earlier Cadomian orogeny (650 to 550 million years ago). The region was tectonic uplift, uplifted when the Bay of Biscay opened during the Cretaceous period (geology), period. The Cantabrian Mountains and the Armorican Massif were then rift shoulders of the Bay of Biscay. The competence (geo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
French Hercynian Massifs EN
French may refer to: * Something of, from, or related to France ** French language, which originated in France ** French people, a nation and ethnic group ** French cuisine, cooking traditions and practices Arts and media * The French (band), a British rock band * French (episode), "French" (episode), a live-action episode of ''The Super Mario Bros. Super Show!'' * Française (film), ''Française'' (film), a 2008 film * French Stewart (born 1964), American actor Other uses * French (surname), a surname (including a list of people with the name) * French (tunic), a type of military jacket or tunic * French's, an American brand of mustard condiment * French (catheter scale), a unit of measurement * French Defence, a chess opening * French kiss, a type of kiss See also * France (other) * Franch, a surname * French Revolution (other) * French River (other), several rivers and other places * Frenching (other) * Justice French (other) ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Neoproterozoic
The Neoproterozoic Era is the last of the three geologic eras of the Proterozoic geologic eon, eon, spanning from 1 billion to 538.8 million years ago, and is the last era of the Precambrian "supereon". It is preceded by the Mesoproterozoic era and succeeded by the Paleozoic era of the Phanerozoic eon, and is further subdivided into three geologic period, periods, the Tonian, Cryogenian and Ediacaran. One of the most severe glaciation events known in the geologic record occurred during the Cryogenian period of the Neoproterozoic, when global ice sheets may have reached the equator and created a "Snowball Earth" lasting about 100 million years. The earliest fossils of complex life are found in the Tonian period in the form of ''Otavia'', a primitive sponge, and the earliest fossil evidence of metazoan evolutionary radiation, radiation are found in the Ediacaran period, which included the namesaked Ediacaran biota as well as the oldest definitive cnidarians and bilaterians in th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Monts D'Arrée
The Monts d'Arrée, or Menezioù Are in Breton, are an ancient mountain range in western Brittany, which forms part of the Armorican massif The Armorican Massif (, ) is a geologic massif that covers a large area in the northwest of France, including Brittany, the western part of Normandy and the Pays de la Loire. It is important because it is connected to Dover on the British side o .... Historically it marked the border of the regions of Cornouaille and Léon. The highest elevation is 385m (1,283 ft) at Roc'h Ruz. The mounts constitute rocks dramatically emerging from the land, running north-east - south-west. Image:Bretagne_Finistere_RocTrevezel_1991_001.jpg, Roc'h Trevezel Image:Bretagne_Finistere_RocTrevezel_1991_002.jpg, Roc'h Trevezel File:Émetteur de Roc'h Trédudon.jpg, Roc'h Tredudon External links Statistic concerning Breton mountains. {{DEFAULTSORT:Monts D'Arree Mountain ranges of Brittany Brittany region articles needing translation from French Wik ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mayenne
Mayenne ( ) is a landlocked department in northwest France named after the river Mayenne. Mayenne is part of the administrative region of Pays de la Loire and is surrounded by the departments of Manche, Orne, Sarthe, Maine-et-Loire, and Ille-et-Vilaine. Mayenne is one of the original 83 departments created during the French Revolution on 4 March 1790. The northern two thirds correspond to the western part of the former province of Maine. The southern third of Mayenne corresponds to the northern portion of the old province of Anjou. The inhabitants of the department are called ''Mayennais''. It had a population of 307,062 in 2019.Populations légales 2019: 53 Mayenne INSEE History Like 82 other departments, Mayenne was created on 4 March 1790 during the early stages ...[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mont Des Avaloirs
Mont may refer to: Places * Mont., an abbreviation for Montana, a U.S. state * Mont, Belgium (other), several places in Belgium * Mont, Hautes-Pyrénées, a commune in France * Mont, Pyrénées-Atlantiques, a commune in France * Mont, Saône-et-Loire, a commune in France Other uses * Mont (food), a category of Burmese snacks and desserts * Mont (surname) * Mont., botanical author abbreviation of Camille Montagne Jean Pierre François Camille Montagne (15 February 1784 – 5 December 1866) was a French people, French military physician and botanist who specialized in the fields of bryology and mycology. Life Montague was born in the commune of Vaudoy i ... (1784-1866), French military physician and botanist * '' Seawise Giant'', the largest ship in the world, later renamed MV ''Mont'' for her final journey * Menthu or Mont, a deity in Egyptian mythology * M.O.N.T, South Korean boy group * Metal-organic nanotubes, a class of polymers See also * Le Mont (disambi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Peneplain
In geomorphology and geology, a peneplain is a low-relief plain formed by protracted erosion. This is the definition in the broadest of terms, albeit with frequency the usage of peneplain is meant to imply the representation of a near-final (or penultimate) stage of fluvial erosion during times of extended tectonic stability. Peneplains are sometimes associated with the cycle of erosion theory of William Morris Davis, but Davis and other researchers have also used the term in a purely descriptive manner without any theory or particular genesis attached. Discussion 390px, Sketch of a hypothetical peneplain formation after an orogeny. The existence of some peneplains, and peneplanation as a process in nature, is not without controversy, due to a lack of contemporary examples and uncertainty in identifying relic examples. By some definitions, peneplains grade down to a base level represented by sea level, yet in other definitions such a condition is ignored. Geomorphologist K ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Plateau
In geology and physical geography, a plateau (; ; : plateaus or plateaux), also called a high plain or a tableland, is an area of a highland consisting of flat terrain that is raised sharply above the surrounding area on at least one side. Often one or more sides have deep hills or escarpments. Plateaus can be formed by a number of processes, including upwelling of volcanic magma, extrusion of lava, and erosion by water and glaciers. Plateaus are classified according to their surrounding environment as intermontane, piedmont, or continental. A few plateaus may have a small flat top while others have wider ones. Formation Plateaus can be formed by a number of processes, including upwelling of volcanic magma, extrusion of lava, plate tectonics movements, and erosion by water and glaciers. Volcanic Volcanic plateaus are produced by volcanic activity. They may be formed by upwelling of volcanic magma or extrusion of lava. The underlining mechanism in forming p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Competence (geology)
In geology, competence refers to the degree of resistance of rocks to deformation or flow. In mining, 'competent rocks' are those in which an unsupported opening can be made. More competent rock weathers slower than less competent rock. Characteristics Competent rocks are more commonly exposed at outcrops as they tend to form upland areas and high cliffs, or headlands where present on a coastline. Incompetent rocks tend to form lowlands and are often poorly exposed at the surface. During deformation, competent beds tend to deform elastically by either buckling, or faulting and fracturing. Incompetent beds tend to deform more plastically, although it is the ''competence contrast'' between different rocks that is most important in determining the types of structure that are formed. The relative competence of rocks may change with temperature, such as in metamorphosed limestone Limestone is a type of carbonate rock, carbonate sedimentary rock which is the main source of th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rift Shoulder
In geology, a rift is a linear zone where the lithosphere is being pulled apart and is an example of extensional tectonics. Typical rift features are a central linear downfaulted depression, called a graben, or more commonly a half-graben with normal faulting and rift-flank uplifts mainly on one side. Where rifts remain above sea level they form a rift valley, which may be filled by water forming a rift lake. The axis of the rift area may contain volcanic rocks, and active volcanism is a part of many, but not all, active rift systems. Major rifts occur along the central axis of most mid-ocean ridges, where new oceanic crust and lithosphere is created along a divergent boundary between two tectonic plates. ''Failed rifts'' are the result of continental rifting that failed to continue to the point of break-up. Typically the transition from rifting to spreading develops at a triple junction where three converging rifts meet over a hotspot. Two of these evolve to the poi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cantabrian Mountains
The Cantabrian Mountains or Cantabrian Range () are one of the main systems of mountain ranges in Spain. They stretch for over 300 km (180 miles) across northern Spain, from the western limit of the Pyrenees to the Galician Massif in Galicia, along the coast of the Cantabrian Sea. Their easternmost end meets the Sistema Ibérico. These mountains are a distinct physiographic province of the larger Alpine System physiographic division. The Cantabrian Mountains offer a wide range of trails for hiking, as well as many challenging climbing routes. Skiing is possible in the ski resorts of Alto Campoo, Valgrande-Pajares, Fuentes de Invierno, San Isidro, Leitariegos and Manzaneda. Geography The Cantabrian Mountains stretch east–west, nearly parallel to the Cantabrian Sea, as far as the Pass of Leitariegos, also extending south between León and Galicia. The range's western boundary is marked by the valley of the river Minho (), by the lower Sil, which flows into ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Period (geology)
The geologic time scale or geological time scale (GTS) is a representation of time based on the rock record of Earth. It is a system of chronological dating that uses chronostratigraphy (the process of relating strata to time) and geochronology (a scientific branch of geology that aims to determine the age of rocks). It is used primarily by Earth scientists (including geologists, paleontologists, geophysicists, geochemists, and paleoclimatologists) to describe the timing and relationships of events in geologic history. The time scale has been developed through the study of rock layers and the observation of their relationships and identifying features such as lithologies, paleomagnetic properties, and fossils. The definition of standardised international units of geological time is the responsibility of the International Commission on Stratigraphy (ICS), a constituent body of the International Union of Geological Sciences (IUGS), whose primary objective is to precisely ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
