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Sierra Madrona
Sierra Madrona is a mountain range of the Sierra Morena, Spain. It is located in Ciudad Real Province, in the region of Castile-La Mancha as well as the Córdoba and Jaén provincial limits, Andalusia. Its highest peak, 1,332 m high Bañuela, is the highest point of the whole Sierra Morena system. Other notable summits are Dormideros 1,328 m, ''Corral de Borros'' 1,312 m, Abulagoso 1,301 m and ''Rebollera'' 1,161 m. Description Sierra Madrona is a massif composed of a series of subranges including ''Sierra de Quintana'', ''Sierra de Hornilleros'', ''Sierra de Navalmanzano'', ''Sierra de la Garganta'' and ''Sierra del Nacedero''. They are aligned in a NW-SE direction and are separated by narrow valleys. The range is bounded by the Robledillo river valley and ''Sierra de la Solana'' and ''Umbria de Alcudia'' in the North, the Montoro river valley in the East, by the smooth hills of Sierra de Andújar, Sierra Quiteria and Los Pedroches in the South, and by the Yeguas River vall ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Los Pedroches
Los Pedroches is a natural region and comarca in Córdoba Province, Andalusia, southern Spain. It is located in the Sierra Morena area at the northern end of the province. The main town is Pozoblanco. The climate of the comarca is continental. It is the northernmost Andalusian territory. The name of the present-day official comarca is ''Valle de los Pedroches''. Municipalities *Alcaracejos *Añora * Belalcázar * Cardeña ** Venta del Charco ** Azuel *Conquista *Dos Torres * El Guijo *El Viso *Fuente la Lancha *Hinojosa del Duque *Pedroche *Pozoblanco * Santa Eufemia *Torrecampo *Villanueva del Duque *Villaralto *Villanueva de Córdoba See also *Comarcas of Andalusia *Pedroche Pedroche is a municipality in the province of Córdoba, Andalusia, Spain. It is located at the centre of Los Pedroches comarca, the northernmost part of Córdoba and Andalusia. Landmarks ;Convent The Convento de Nuestra Señora de la Concepci ... References External links * Mancomunidad de Munici ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hercynian
The Variscan or Hercynian orogeny was a geologic mountain-building event caused by Late Paleozoic continental collision between Euramerica (Laurussia) and Gondwana to form the supercontinent of Pangaea. Nomenclature The name ''Variscan'', comes from the Medieval Latin name for the district '' Variscia'', the home of a Germanic tribe, the Varisci; Eduard Suess, professor of geology at the University of Vienna, coined the term in 1880. (Variscite, a rare green mineral first discovered in the Vogtland district of Saxony in Germany, which is in the Variscan belt, has the same etymology.) ''Hercynian'', on the other hand, derives from the Hercynian Forest. Both words were descriptive terms of strike directions observed by geologists in the field, ''variscan'' for southwest to northeast, ''hercynian'' for northwest to southeast. The ''variscan'' direction reflected the direction of ancient fold belts cropping out throughout Germany and adjacent countries and the meaning shifted fro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Syncline
In structural geology, a syncline is a fold with younger layers closer to the center of the structure, whereas an anticline is the inverse of a syncline. A synclinorium (plural synclinoriums or synclinoria) is a large syncline with superimposed smaller folds. Synclines are typically a downward fold (synform), termed a synformal syncline (i.e. a trough), but synclines that point upwards can be found when strata have been overturned and folded (an antiformal syncline). Characteristics On a geologic map, synclines are recognized as a sequence of rock layers, with the youngest at the fold's center or ''hinge'' and with a reverse sequence of the same rock layers on the opposite side of the hinge. If the fold pattern is circular or elongate, the structure is a basin. Folds typically form during crustal deformation as the result of compression that accompanies orogenic mountain building. Notable examples * Powder River Basin, Wyoming, US * Sideling Hill roadcut along Interstate ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anticline
In structural geology, an anticline is a type of fold that is an arch-like shape and has its oldest beds at its core, whereas a syncline is the inverse of an anticline. A typical anticline is convex up in which the hinge or crest is the location where the curvature is greatest, and the limbs are the sides of the fold that dip away from the hinge. Anticlines can be recognized and differentiated from antiforms by a sequence of rock layers that become progressively older toward the center of the fold. Therefore, if age relationships between various rock strata are unknown, the term antiform should be used. The progressing age of the rock strata towards the core and uplifted center, are the trademark indications for evidence of anticlines on a geologic map. These formations occur because anticlinal ridges typically develop above thrust faults during crustal deformations. The uplifted core of the fold causes compression of strata that preferentially erodes to a deeper st ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sandstone
Sandstone is a clastic sedimentary rock composed mainly of sand-sized (0.0625 to 2 mm) silicate grains. Sandstones comprise about 20–25% of all sedimentary rocks. Most sandstone is composed of quartz or feldspar (both silicates) because they are the most resistant minerals to weathering processes at the Earth's surface. Like uncemented sand, sandstone may be any color due to impurities within the minerals, but the most common colors are tan, brown, yellow, red, grey, pink, white, and black. Since sandstone beds often form highly visible cliffs and other topographic features, certain colors of sandstone have been strongly identified with certain regions. Rock formations that are primarily composed of sandstone usually allow the percolation of water and other fluids and are porous enough to store large quantities, making them valuable aquifers and petroleum reservoirs. Quartz-bearing sandstone can be changed into quartzite through metamorphism, usually related to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Greywacke
Greywacke or graywacke (German ''grauwacke'', signifying a grey, earthy rock) is a variety of sandstone generally characterized by its hardness, dark color, and poorly sorted angular grains of quartz, feldspar, and small rock fragments or lithic fragments set in a compact, clay-fine matrix. It is a texturally immature sedimentary rock generally found in Paleozoic strata. The larger grains can be sand- to gravel-sized, and matrix materials generally constitute more than 15% of the rock by volume. The term "greywacke" can be confusing, since it can refer to either the immature (rock fragment) aspect of the rock or its fine-grained (clay) component. The origin of greywacke was unknown until turbidity currents and turbidites were understood, since, according to the normal laws of sedimentation, gravel, sand and mud should not be laid down together. Geologists now attribute its formation to submarine avalanches or strong turbidity currents. These actions churn sediment and cause mi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Schist
Schist ( ) is a medium-grained metamorphic rock showing pronounced schistosity. This means that the rock is composed of mineral grains easily seen with a low-power hand lens, oriented in such a way that the rock is easily split into thin flakes or plates. This texture (geology), texture reflects a high content of platy minerals, such as micas, talc, chlorite group, chlorite, or graphite. These are often interleaved with more granular minerals, such as feldspar or quartz. Schist typically forms during regional metamorphism accompanying the process of mountain building (orogeny) and usually reflects a medium Metamorphism#Metamorphic grades, grade of metamorphism. Schist can form from many different kinds of rocks, including sedimentary rocks such as mudstones and igneous rocks such as tuffs. Schist metamorphosed from mudstone is particularly common and is often very rich in mica (a ''mica schist''). Where the type of the original rock (the protolith) is discernible, the schist is us ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geologically
Geology () is a branch of natural science concerned with Earth and other astronomical objects, the features or rocks of which it is composed, and the processes by which they change over time. Modern geology significantly overlaps all other Earth sciences, including hydrology, and so is treated as one major aspect of integrated Earth system science and planetary science. Geology describes the structure of the Earth on and beneath its surface, and the processes that have shaped that structure. It also provides tools to determine the relative and absolute ages of rocks found in a given location, and also to describe the histories of those rocks. By combining these tools, geologists are able to chronicle the geological history of the Earth as a whole, and also to demonstrate the age of the Earth. Geology provides the primary evidence for plate tectonics, the evolutionary history of life, and the Earth's past climates. Geologists broadly study the properties and processes of Earth ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cave Paintings
In archaeology, Cave paintings are a type of parietal art (which category also includes petroglyphs, or engravings), found on the wall or ceilings of caves. The term usually implies prehistoric art, prehistoric origin, and the oldest known are more than 40,000 years old (art of the Upper Paleolithic), found in the caves in the district of Maros (Sulawesi, Indonesia). The oldest are often constructed from hand stencils and simple geometric shapes.M. Aubert et al., "Pleistocene cave art from Sulawesi, Indonesia", ''Nature'' volume 514, pages 223–227 (09 October 2014). "using uranium-series dating of coralloid speleothems directly associated with 12 human hand stencils and two figurative animal depictions from seven cave sites in the Maros karsts of Sulawesi, we show that rock art traditions on this Indonesian island are at least compatible in age with the oldest European art. The earliest dated image from Maros, with a minimum age of 39.9 kyr, is now the oldest known hand stencil in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Puertollano
Puertollano () is a municipality of Spain located in the province of Ciudad Real, Castile-La Mancha. The city has a population of 47,035 (2019). Contrasting to the largely rural character of the region, Puertollano stands out for the importance of industry, with a past linked to industrial and mining activities. It lies on the AVE high speed train line linking Madrid and Seville (opened 1992). Geography Location Puertollano is located in the Iberian Peninsula, in the transitional region between the southern half of the Inner Plateau and the northern reaches of Sierra Morena. It lies at the natural pass linking the plains of Argamasilla to the North and the valley of the river to the south, on which a modest East–West chain of mountains interrupts, at about 710 metres above sea level. The Ojailén, a tributary of the (in turn a right-bank tributary of the Guadalquivir), originally belonged to the Guadiana basin, yet it was later captured by the Guadalquivir basin. It ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Andújar
Andújar () is a Spanish municipality of 38,539 people (2005) in the province of Jaén, in Andalusia. The municipality is divided by the Guadalquivir River. The northern part of the municipality is where the Natural Park of the Sierra de Andújar is situated. To the south are agricultural fields and countryside. The city proper located on the right bank of the Guadalquivir and the Madrid- Córdoba railway. In the past, Andújar was widely known for its porous earthenware jars, called ''alcarrazas'' or '' botijos'', which keep water cool in the hottest weather, and were manufactured from a whitish clay found in the neighbourhood. History Antiquity Paleolithic artifacts have been found in the area, associated with the Acheulean Culture, but it is during the Neolithic Age when the area became increasingly populated, with agriculture being developed in the fertile land, and mining activities beginning in the Sierra Morena. According to archaeological studies, the first pe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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