|
Armorican Massif
The Armorican Massif (french: Massif armoricain, ) 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 Gaul area between the rivers Loire and Seine. The massif is composed of metamorphic and magmatic rocks that were metamorphosed and/or deformed during the Hercynian or Variscan orogeny (400 to 280 million years ago) and the earlier Cadomian orogeny (650 to 550 million years ago). The region was uplifted when the Bay of Biscay opened during the Cretaceous period. The Cantabrian Mountains and the Armorican Massif were then rift shoulders of the Bay of Biscay. The competent old rocks of the Armorican Massif have been eroded to a plateaulike peneplain. The highest ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
French Hercynian Massifs EN
French (french: français(e), link=no) may refer to: * Something of, from, or related to France ** French language, which originated in France, and its various dialects and accents ** French people, a nation and ethnic group identified with France ** French cuisine, cooking traditions and practices Fortnite French places Arts and media * The French (band), a British rock band * "French" (episode), a live-action episode of ''The Super Mario Bros. Super Show!'' * ''Française'' (film), 2008 * French Stewart (born 1964), American actor Other uses * French (surname), a surname (including a list of people with the name) * French (tunic), a particular type of military jacket or tunic used in the Russian Empire and Soviet Union * French's, an American brand of mustard condiment * French catheter scale, a unit of measurement of diameter * French Defence, a chess opening * French kiss, a type of kiss involving the tongue See also * France (other) * Franch, a surname * Frenc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Neoproterozoic
The Neoproterozoic Era is the unit of geologic time from 1 billion to 538.8 million years ago. It is the last era of the Precambrian Supereon and the Proterozoic Eon; it is subdivided into the Tonian, Cryogenian, and Ediacaran periods. It is preceded by the Mesoproterozoic Era and succeeded by the Paleozoic Era of the Phanerozoic Eon. The most severe glaciation known in the geologic record occurred during the Cryogenian, when ice sheets may have reached the equator and formed a "Snowball Earth". The earliest fossils of complex multicellular life are found in the Ediacaran Period. These organisms make up the Ediacaran biota, including the oldest definitive animals in the fossil record. According to Rino and co-workers, the sum of the continental crust formed in the Pan-African orogeny and the Grenville orogeny makes the Neoproterozoic the period of Earth's history that has produced most continental crust. Geology At the onset of the Neoproterozoic the supercontinent Rod ... [...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. Historically it marked the border of the regions of Cornouaille Cornouaille (; br, Kernev, Kerne) is a historical region on the west coast of Brittany in West France. The name is cognate with Cornwall in neighbouring Great Britain. This can be explained by the settlement of Cornouaille by migrant princ ... and Léon. The mounts constitute rocks dramatically emerging from the land, running in a north-eastern line across the landscape. 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 References External links Statistic concerning Breton mountains. {{DEFAULTSORT:Monts D'Arree Mountain ranges of Brittany Brittany region articles needing translation from French Wikipedia ... [...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 o ...[...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 (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 See also * Le Mont (other) * Monts (other) * Monte (other) Monte may refer to: Places Argentina * Argentine Monte, an ecoregion * Monte Desert * Monte Partido, a ''partido'' in Buenos Aires Province Italy * Monte Bregagno * Monte Cassino * Montecorvino (other) * Montefalcione Por ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Peneplain
390px, Sketch of a hypothetical peneplain formation after an orogeny. 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 workers have also used the term in a purely descriptive manner without any theory or particular genesis attached. 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 Karna Lidmar-Bergst ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Plateau
In geology and physical geography, a plateau (; ; ), 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 wide 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. The Columbia Plateau in the north-western United States is an example. They may be formed by upwelling of volcanic magma or extrusion of ... [...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. 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 limestones, which are relatively competent at low metamorphic grade, but become highly incompetent at high metamorphic grade. Most sedimentary and volcanic sequences show laye ... [...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
, etymology=Named after the Cantabri , photo=Cordillera Cantábrica vista desde el Castro Valnera.jpg , photo_caption=Cantabrian Mountains parallel to the Cantabrian Sea seen from Castro Valnera in an east-west direction. In the background, the Montaña Palentina (left) and the Picos de Europa (right) , country= Spain , subdivision1_type=Communities , subdivision1= , geology= Limestone , age= Carboniferous, Paleozoic, Mesozoic , orogeny= , borders_on= , area_km2= , length_km=300 , length_orientation=WE , width_km= 50 , width_orientation=NS , highest=Torre de Cerredo , elevation_m= 2648 , range_coordinates= , coordinates= , map_image=Cordillera Cantabrica.jpg , map_caption=Location of the Cantabrian Mountains in northern Spain , parent= The Cantabrian Mountains or Cantabrian Range ( es, Cordillera Cantábrica) are one of the main systems of mountain ranges in Spain. They stretch for over 300 km (180 miles) across northern Spain, fro ... [...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 (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 standardized international units of geologic 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 de ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
