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Cosdon Hill
Cosdon Hill, also called Cosdon Beacon, or Cawsand Beacon, is one of the highest hills on Dartmoor, in Devon, England. It has numerous traces of prehistoric occupation. Description Cosdon is a large, rounded hill that rises to . The first written record of the hill is to the ''Hoga de Cossdonne'' in 1240. The name Cossdonne seems to mean "Cost(a)'s hill", where "Cost" or "Costa" is the name of a person. The shape of the hill gives a false impression of size, and for many years Cosdon was thought to be the highest on Dartmoor. The surveyors of the Principal Triangulation of Great Britain took bearings that resulted in the first Ordnance Survey map of Dartmoor in 1809, which showed that Yes Tor was higher. However, in 1830 Samuel Rowe still wrote that Cawson or Cosdon hill was the highest in Dartmoor. An 1894 guide for cyclists going from Exeter to Launceston said, "So vast is the bulk of Cosdon that, were is not for the cloud mists that so often drift round his brow, one would h ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sampford Courtenay
Sampford Courtenay is a village and civil parishes in England, civil parish in West Devon in England, most famous for being the place where the Western Rebellion, otherwise known as the Prayerbook rebellion, first started, and where the rebels made their final stand. It has a population of around 600. The Church of St Andrew is mainly built of granite and has an elegant tower.Betjeman, J. (ed.) (1968) Collins Pocket Guide to English Parish Churches: the South. London: Collins; p. 165 It was served by the nearby Sampford Courtenay railway station at Belstone Corner. Literature Sampford Courtenay is the area author M.R. James had in mind for his short ghost story Martin's Close published in More Ghost Stories in 1911. The New Inn featured in this story is also a real place and a grade II listed old coaching inn originally built in the 16th Century References External links Villages in Devon {{devon-geo-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bronze Age
The Bronze Age is a historic period, lasting approximately from 3300 BC to 1200 BC, characterized by the use of bronze, the presence of writing in some areas, and other early features of urban civilization. The Bronze Age is the second principal period of the three-age system proposed in 1836 by Christian Jürgensen Thomsen for classifying and studying ancient societies and history. An ancient civilization is deemed to be part of the Bronze Age because it either produced bronze by smelting its own copper and alloying it with tin, arsenic, or other metals, or traded other items for bronze from production areas elsewhere. Bronze is harder and more durable than the other metals available at the time, allowing Bronze Age civilizations to gain a technological advantage. While terrestrial iron is naturally abundant, the higher temperature required for smelting, , in addition to the greater difficulty of working with the metal, placed it out of reach of common use until the end o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Feldspar
Feldspars are a group of rock-forming aluminium tectosilicate minerals, also containing other cations such as sodium, calcium, potassium, or barium. The most common members of the feldspar group are the ''plagioclase'' (sodium-calcium) feldspars and the ''alkali'' (potassium-sodium) feldspars. Feldspars make up about 60% of the Earth's crust, and 41% of the Earth's continental crust by weight. Feldspars crystalize from magma as both intrusive and extrusive igneous rocks and are also present in many types of metamorphic rock. Rock formed almost entirely of calcic plagioclase feldspar is known as anorthosite. Feldspars are also found in many types of sedimentary rocks. Compositions The feldspar group of minerals consists of tectosilicates, silicate minerals in which silicon ions are linked by shared oxygen ions to form a three-dimensional network. Compositions of major elements in common feldspars can be expressed in terms of three endmembers: * potassium feldspar (K-spar) ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Actinolite
Actinolite is an amphibole silicate mineral with the chemical formula . Etymology The name ''actinolite'' is derived from the Greek word ''aktis'' (), meaning "beam" or "ray", because of the mineral's fibrous nature. Mineralogy Actinolite is an intermediate member in a solid-solution series between magnesium-rich tremolite, , and iron-rich ferro-actinolite, . Mg and Fe ions can be freely exchanged in the crystal structure. Like tremolite, asbestiform actinolite is regulated as asbestos. Occurrence Actinolite is commonly found in metamorphic rocks, such as contact aureoles surrounding cooled intrusive igneous rocks. It also occurs as a product of metamorphism of magnesium-rich limestones. The old mineral name ''uralite'' is at times applied to an alteration product of primary pyroxene by a mixture composed largely of actinolite. The metamorphosed gabbro or diabase rock bodies, referred to as epidiorite, contain a considerable amount of this ''uralitic'' alteration. Fibrous ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bismuth
Bismuth is a chemical element with the Symbol (chemistry), symbol Bi and atomic number 83. It is a post-transition metal and one of the pnictogens, with chemical properties resembling its lighter group 15 siblings arsenic and antimony. Elemental bismuth occurs naturally, and its sulfide and oxide forms are important commercial ores. The free element is 86% as dense as lead. It is a brittle metal with a silvery-white color when freshly produced. Passivation (chemistry), Surface oxidation generally gives samples of the metal a somewhat rosy cast. Further oxidation under heat can give bismuth a vividly Iridescence, iridescent appearance due to thin-film interference. Bismuth is both the most Diamagnetism, diamagnetic element and one of the least Thermal conductivity, thermally conductive metals known. Bismuth was long considered the element with the highest atomic mass whose nuclei do not spontaneously decay. However, in 2003 it was discovered to be extremely weakly radioactive. The ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
River Tavy
The Tavy () is a river on Dartmoor, Devon, England. The name derives from the Brythonic root "Tam", once thought to mean 'dark' but now generally understood to mean 'to flow'. It has given its name to the town of Tavistock and the villages of Mary Tavy and Peter Tavy. It is a tributary of the River Tamar and has as its own tributaries: * Collybrooke * River Burn *River Wallabrooke *River Lumburn *River Walkham At Tavistock it feeds a canal running to Morwellham Quay. Its mouth is crossed by the Tavy Bridge which carries the Tamar Valley railway line. Navigation The river is navigable inland as far as Lopwell, where a weir marks the normal tidal limit, about a journey from North Corner Quay at Devonport. River transport was an important feature of the local farming, mining, tourism and forestry economies. The Queen's Harbour Master for Plymouth is responsible for managing navigation on the River Tavy up to the normal tidal limit. See also *Tamar–Tavy Estuary The T ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mispickel
Arsenopyrite ( IMA symbol: Apy) is an iron arsenic sulfide (FeAsS). It is a hard ( Mohs 5.5-6) metallic, opaque, steel grey to silver white mineral with a relatively high specific gravity of 6.1. When dissolved in nitric acid, it releases elemental sulfur. When arsenopyrite is heated, it produces sulfur and arsenic vapor. With 46% arsenic content, arsenopyrite, along with orpiment, is a principal ore of arsenic. When deposits of arsenopyrite become exposed to the atmosphere, the mineral slowly converts into iron arsenates. Arsenopyrite is generally an acid-consuming sulfide mineral, unlike iron pyrite which can lead to acid mine drainage. The crystal habit, hardness, density, and garlic odour when struck are diagnostic. Arsenopyrite in older literature may be referred to as ''mispickel'', a name of German origin. Arsenopyrite also can be associated with significant amounts of gold. Consequently, it serves as an indicator of gold bearing reefs. Many arsenopyrite gold ores ar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Adit
An adit (from Latin ''aditus'', entrance) is an entrance to an underground mine which is horizontal or nearly horizontal, by which the mine can be entered, drained of water, ventilated, and minerals extracted at the lowest convenient level. Adits are also used to explore for mineral veins. Construction Adits are driven into the side of a hill or mountain, and are often used when an ore body is located inside the mountain but above the adjacent valley floor or coastal plain. In cases where the mineral vein outcrops at the surface, the adit may follow the lode or vein until it is worked out, in which case the adit is rarely straight. The use of adits for the extraction of ore is generally called drift mining. Adits can only be driven into a mine where the local topography permits. There will be no opportunity to drive an adit to a mine situated on a large flat plain, for instance. Also if the ground is weak, the cost of shoring up a long adit may outweigh its possible advantage ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sticklepath
Sticklepath is a village on Dartmoor, in the county of Devon, England. It gives its name to one of the most important geological faults in south-west England, thought to have originated during the Tertiary period and known variously as the Sticklepath Fault, Sticklepath Fault Zone, Lustleigh-Sticklepath Fault or Sticklepath-Lustleigh Fault. Further reading *''The Story of Sticklepath'', Sticklepath Women's Institute The Women's Institute (WI) is a community-based organisation for women in the United Kingdom, Canada, South Africa and New Zealand. The movement was founded in Stoney Creek, Ontario, Canada, by Erland and Janet Lee with Adelaide Hoodless being the ... *''The Finch Foundry Trust and Sticklepath Museum of Rural Industry'', R.A. Barron External links Villages in Devon Dartmoor {{Devon-geo-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
River Taw
The River Taw () rises at Taw Head, a spring on the central northern flanks of Dartmoor, crosses North Devon and at the town of Barnstaple, formerly a significant port, empties into Bideford Bay in the Bristol Channel, having formed a large estuary of wide meanders which at its western end is the estuary of the River Torridge. Course As a stream the Taw heads north and gives its name to the villages of South Tawton and North Tawton. Headwaters add to the size from a number of two major upper course tributaries including the Lapford Yeo and Little Dart River. Along the middle course the Taw receives the River Mole (distributary of the River Bray and a second Yeo), which all rise on upland Exmoor to the north-east. By this midway stage the river has increased in size and becomes a season-round recreational trout, sea trout and salmon river before becoming tidal at ''Newbridge'', approximately from the sea. The river drains a variable width basin as one of many rivers in the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Crediton
Crediton is a town and civil parish in the Mid Devon district of Devon in England. It stands on the A377 Exeter to Barnstaple road at the junction with the A3072 road to Tiverton, about north west of Exeter and around from the M5 motorway. It has a population of 8,304. However, the combined population of the parishes that make up the Crediton area is estimated to be 21,990. The town is situated in the narrow vale of the River Creedy, between two steep hills and is divided into two parts, the north or old town (People's park, Queen Elizabeth's Community College etc.) and the south and east or new town. (QECC Barnfield, Saxon Close etc.) History The first indication of settlement at Crediton is the claim that Winfrith or Saint Boniface was born here in c. 672. (text onlinhere) He propagated Christianity in the Frankish Empire during the 8th century and is the patron saint of both Germany and the Netherlands. In 909 a see was established here with Edwulf as the first bish ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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