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Alvão Natural Park
Alvão Natural Park () is a protected area founded in 1983, and located in the Concelho, municipalities of Mondim de Basto and Vila Real Municipality, Vila Real, in the Tâmega Subregion, Tâmega and Douro Subregions of Norte Region, Portugal, northern Portugal. Although the smallest of Portugal's natural parks, it extends through of mountainous land, populated by approximately 700 locals. History The park was created on 8 June 1983 under terms of decree-law 237/83, as a classified natural park.ICNF: Enquandramento (2004), p.12 In order to support the conservation of nature, a resolution of the Council of Ministers (142/97), dated 28 August 1997, integrated Alvão into a broader area of classification under terms of the European Union's Natura 2000 designation: Sítio Alvão-Marão como (Sítio TCON0003 – Alvão-Marão).ICNF (2004), p.13 Under this arrangement community directives, such as those for bird species (79/409/CEE, 2 April) and habitats (92/43/CEE, 21 May) were includ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vila Real (district)
The District of Vila Real ( ) is a district of northern Portugal. With an area of , the district is located east of the port city of Porto and north of the Douro, Douro River. Vila Real has always belonged to the historical province of Trás-os-Montes Province, Trás-os-Montes. It is bordered by Spain (Galicia (Spain), Galicia) in the north and east, Braga District and Porto District in the west, Viseu District in the south and Bragança District in the east. Approximate population in the 2001 census was 230,000. The population has shown negative rates in recent years due to emigration and aging. Many of the villages have lost population and have become deserted, while the Vila Real, namesake district capital has gained in population. Geographic and socioeconomic characteristics Vila Real is a rugged area of low mountains and narrow valleys. Historically it had always been cut off from the coast by the Marão, Gerês, and Cabreira mountains until a highway was cut through ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vila Marim
Vila may refer to: People *Vila (surname) Places Andorra * Vila, Andorra, a town in the parish of Encamp Brazil * Vila Bela da Santíssima Trindade, a municipality in the State of Mato Grosso * Vila Boa, Goiás, a municipality in the State of Goiás * Vila Flores, a municipality in Rio Grande do Sul * Vila Flor, a municipality in Rio Grande do Norte * Vila Império, a urbanized neighborhood in Minas Gerais. * Vila Lângaro, a municipality in Rio Grande do Sul * Vila Maria (district of São Paulo), a municipality in Rio Grande do Sul * Vila Nova do Piauí, a municipality of Piauí * Vila Nova dos Martírios, a municipality of Maranhão * Vila Nova do Sul, a municipality in Rio Grande do Sul * Vila Pavão, a municipality in Espírito Santo * Vila Propício, a municipality in the State of Goiás * Vila Rica, a municipality in the State of Minas Gerais * Vila Valério, a municipality in Espírito Santo * Vila Velha, a municipality in Espírito Santo Estonia * Vila, Estonia, vil ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ordovician
The Ordovician ( ) is a geologic period and System (geology), system, the second of six periods of the Paleozoic Era (geology), Era, and the second of twelve periods of the Phanerozoic Eon (geology), Eon. The Ordovician spans 41.6 million years from the end of the Cambrian Period Megaannum, Ma (million years ago) to the start of the Silurian Period Ma. The Ordovician, named after the Celtic Britons, Welsh tribe of the Ordovices, was defined by Charles Lapworth in 1879 to resolve a dispute between followers of Adam Sedgwick and Roderick Murchison, who were placing the same Rock (geology), rock beds in North Wales in the Cambrian and Silurian systems, respectively. Lapworth recognized that the fossil fauna in the disputed Stratum, strata were different from those of either the Cambrian or the Silurian systems, and placed them in a system of their own. The Ordovician received international approval in 1960 (forty years after Lapworth's death), when it was adopted as an official per ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Silurian
The Silurian ( ) is a geologic period and system spanning 23.5 million years from the end of the Ordovician Period, at million years ago ( Mya), to the beginning of the Devonian Period, Mya. The Silurian is the third and shortest period of the Paleozoic Era, and the third of twelve periods of the Phanerozoic Eon. As with other geologic periods, the rock beds that define the period's start and end are well identified, but the exact dates are uncertain by a few million years. The base of the Silurian is set at a series of major Ordovician–Silurian extinction events when up to 60% of marine genera were wiped out. One important event in this period was the initial establishment of terrestrial life in what is known as the Silurian-Devonian Terrestrial Revolution: vascular plants emerged from more primitive land plants, dikaryan fungi started expanding and diversifying along with glomeromycotan fungi, and three groups of arthropods ( myriapods, arachnids and hexapods) ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Devonian
The Devonian ( ) is a period (geology), geologic period and system (stratigraphy), system of the Paleozoic era (geology), era during the Phanerozoic eon (geology), eon, spanning 60.3 million years from the end of the preceding Silurian period at million years ago (Megaannum, Ma), to the beginning of the succeeding Carboniferous period at Ma. It is the fourth period of both the Paleozoic and the Phanerozoic. It is named after Devon, South West England, where rocks from this period were first studied. The first significant evolutionary radiation of history of life#Colonization of land, life on land occurred during the Devonian, as free-spore, sporing land plants (pteridophytes) began to spread across dry land, forming extensive coal forests which covered the continents. By the middle of the Devonian, several groups of vascular plants had evolved leaf, leaves and true roots, and by the end of the period the first seed-bearing plants (Pteridospermatophyta, pteridospermatophyt ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Andalusite
Andalusite is an aluminium nesosilicate mineral with the chemical formula Al2SiO5. This mineral was called andalousite by Delamétherie, who thought it came from Andalusia, Spain. It soon became clear that it was a locality error, and that the specimens studied were actually from El Cardoso de la Sierra, in the Spanish province of Guadalajara, not Andalusia. Andalusite is trimorphic with kyanite and sillimanite, being the lower pressure mid temperature polymorph. At higher temperatures and pressures, andalusite may convert to sillimanite. Thus, as with its other polymorphs, andalusite is an aluminosilicate index mineral, providing clues to depth and pressures involved in producing the host rock. Varieties The variety chiastolite commonly contains dark inclusions of carbon or clay which form a cruciform pattern when shown in cross-section. This stone was known at least from the sixteenth century, being taken to many European countries, as a souvenir, by pilgrims returning fr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Greywacke
Greywacke or graywacke ( ) is a variety of sandstone generally characterized by its hardness (6–7 on Mohs scale), dark color, and Sorting (sediment), poorly sorted angular grains of quartz, feldspar, and small rock fragments or sand-size Lithic fragment (geology), lithic fragments set in a compact, clay-fine matrix. It is a texturally immature sedimentary rock generally found in Paleozoic Stratum, strata. The larger Particle size (grain size), grains can be sand- to gravel-sized, and Matrix (geology), matrix materials generally constitute more than 15% of the rock by volume. Formation 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 mixed-sediment slurries, in which the resulting deposits may ex ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Siltstone
Siltstone, also known as aleurolite, is a clastic sedimentary rock that is composed mostly of silt. It is a form of mudrock with a low clay mineral content, which can be distinguished from shale by its lack of fissility. Although its permeability and porosity is relatively low, siltstone is sometimes a tight gas reservoir rock, an unconventional reservoir for natural gas that requires hydraulic fracturing for economic gas production. Siltstone was prized in ancient Egypt for manufacturing statuary and cosmetic palettes. The siltstone quarried at Wadi Hammamat was a hard, fine-grained siltstone that resisted flaking and was almost ideal for such uses. Description There is not complete agreement on the definition of siltstone. One definition is that siltstone is mudrock (clastic sedimentary rock containing at least 50% clay and silt) in which at least 2/3 of the clay and silt fraction is composed of silt-sized particles. Silt is defined as grains 2–62 μm in diam ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phyllite
Phyllite ( ) is a type of foliation (geology), foliated metamorphic rock formed from slate that is further metamorphosed so that very fine grained white mica achieves a preferred orientation.Stephen Marshak ''Essentials of Geology'', 3rd ed. It is primarily composed of quartz, sericite mica, and chlorite group, chlorite. Phyllite has fine-grained mica flakes, whereas slate has extremely fine mica flakes, and schist has large mica flakes, all mica flakes of which have achieved a preferred orientation. Among foliated metamorphic rocks, it represents a gradation in the degree of metamorphism between slate and schist. The minute crystals of graphite, sericite, or chlorite, or the translucent fine-grained white mica, impart a silky, sometimes golden sheen to the surfaces of cleavage (geology), cleavage, called "phyllitic luster". The word comes from the Greek ''phyllon'', meaning "leaf". The protolith (or parent rock) for phyllite is shale or pelite; or slate, which in turn came ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mica
Micas ( ) are a group of silicate minerals whose outstanding physical characteristic is that individual mica crystals can easily be split into fragile elastic plates. This characteristic is described as ''perfect basal cleavage''. Mica is common in igneous and metamorphic rock and is occasionally found as small flakes in sedimentary rock. It is particularly prominent in many granites, pegmatites, and schists, and "books" (large individual crystals) of mica several feet across have been found in some pegmatites. Micas are used in products such as drywalls, paints, and fillers, especially in parts for automobiles, roofing, and in electronics. The mineral is used in cosmetics and food to add "shimmer" or "frost". Properties and structure The mica group comprises 37 phyllosilicate minerals. All crystallize in the monoclinic system, with a tendency towards pseudohexagonal crystals, and are similar in structure but vary in chemical composition. Micas are translucent to opa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Granodiorite
Granodiorite ( ) is a coarse-grained (phaneritic) intrusive igneous rock similar to granite, but containing more plagioclase feldspar than orthoclase feldspar. The term banatite is sometimes used informally for various rocks ranging from granite to diorite, including granodiorite. The term ''granodiorite'' was first used by George F. Becker, G. F. Becker (1893) to describe granitic rocks in the Sierra Nevada, United States. Composition According to the QAPF diagram, granodiorite has a greater than 20% quartz by volume, and between 65% and 90% of the feldspar is plagioclase. A greater amount of plagioclase would designate the rock as tonalite. Granodiorite is felsic to intermediate composition, intermediate in composition. It is the Intrusive rock, intrusive igneous equivalent of the extrusive igneous dacite. It contains a large amount of sodium (Na) and calcium (Ca) rich plagioclase, potassium feldspar, quartz, and minor amounts of muscovite mica as the lighter colored miner ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Albufeira Da Barragem Cimeira Do Alvão - Portugal (50442144807)
Albufeira (, ), officially the City of Albufeira (), is a city and municipality of Faro District in the Algarve region of southern Portugal. The population in 2021 was 44,158, in an area of . The city proper had a population of 28,645 in 2021. It is from Lisbon, close to Paderne Castle. Lagoa is to the west, and Faro to the southeast. A tourist destination due to its coastal conditions, Albufeira's population expands to around 300,000 in the summer and at Christmas and New Year owing to the number of hotels that includes marina facilities, golf courses, restaurants and bars. History It is unclear when the first settlements specifically formed in the region of Albufeira, although scientific research suggests origins during the pre-historic epoch, and that the town of Albufeira formed as an out-port of the maritime fishery. The primitive settlement was occupied by the Romans, who named it ''Baltum'', introducing a centralized administrative structure and developing intense ag ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
