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Geology Of The Isle Of Man
The geology of the Isle of Man consists primarily of a thick pile of sedimentary rocks dating from the Ordovician period, together with smaller areas of later sedimentary and extrusive igneous strata. The older strata was folded and faulted during the Caledonian orogeny, Caledonian and Acadian orogeny, Acadian orogeny, orogenies The bedrock is overlain by a range of glacial and post-glacial deposits. Igneous intrusions in the form of dike (geology), dykes and plutons are common, some associated with mineralization (geology), mineralisation which spawned a minor metal mining industry. Ordovician and Silurian The larger part of the island is formed from rocks of Ordovician age which were traditionally known as the Manx Slates but are now referred by geologists to the Manx Group. The relationships between the various different formations which constitute this sequence is often obscured by fault (geology), faulting but the sequence is considered to be: *Creggan Mooar Formation (''you ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Skiddaw Group
''For the Skiddaw group of hills, see Skiddaw Group'' The Skiddaw Group is a group of sedimentary rock formations named after the mountain Skiddaw in the English Lake District. The rocks are almost wholly Ordovician in age ( Tremadoc through Arenig to Llanvirn epochs) though the lowermost beds are possibly of Cambrian age. This rock sequence has previously been known as the Skiddaw Slates, the Skiddaw Slates Group and the Skiddavian Series. Its base is not exposed but in its main outcrop area, it is considered to be in excess of thick though less elsewhere. It consists largely of mudstones and siltstones with subordinate wacke-type sandstones. Their main occurrence is within the northern and central fells of the Lake District, either side of the major ENE-WSW aligned Causey Pike Fault, but inliers are found at Black Combe in the south of the Lake District and at Cross Fell in the North Pennines. Stratigraphy In the Northern Fells of the Lake District, the Skiddaw Group com ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Calf Of Man
Calf of Man ( gv, Yn Cholloo ) is a island, off the southwest coast of the Isle of Man. It is separated from the Isle of Man by a narrow stretch of water called the Calf Sound. Like the nearby rocky islets of Chicken Rock and Kitterland, it is part of the historic parish of Rushen and the current parish district of Arbory and Rushen. It has only two seasonal inhabitants. The word 'calf' derives from the Old Norse word ''kalfr'' which means a small island lying near a larger one. One can reach the Calf of Man by boat from either Port Erin or Port St Mary. Cow Harbour and South Harbour are the main landing places. The highest part of the island is in the west where an unnamed peak reaches above sea level. Until 1939 the island was under private ownership by the Keig family, but the island was purchased by Mr F J Dickens of Silverdale, Lancashire, who then donated it to the National Trust for it to become a bird sanctuary. In 1951 the Manx Museum & National Trust, which became kn ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arenite
Arenite (Latin: ''arena'', "sand") is a sedimentary clastic rock with sand grain size between 0.0625 mm (0.00246 in) and 2 mm (0.08 in) and contain less than 15% matrix. The related adjective is ''arenaceous''. The equivalent Greek-derived term is psammite, though this is more commonly used for metamorphosed sediments. Since it refers to grain size rather than chemical composition, the term is used for example in the classification of clastic carbonatic limestones, as the granulometrically equivalent term sandstone is not appropriate for limestone. Other arenites include sandstones, arkoses, greensands, and greywackes. Arenites mainly form by erosion of other rocks or turbiditic re-deposition of sands. Some arenites contain a varying amount of carbonatic components and thus belong to the rock-category of carbonatic sandstones or silicatic limestones. Arenites often appear as massive or bedded medium-grained rocks with a middling- to wide-spaced preferred ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Quartz
Quartz is a hard, crystalline mineral composed of silica (silicon dioxide). The atoms are linked in a continuous framework of SiO4 silicon-oxygen tetrahedra, with each oxygen being shared between two tetrahedra, giving an overall chemical formula of SiO2. Quartz is the second most abundant mineral in Earth's continental crust, behind feldspar. Quartz exists in two forms, the normal α-quartz and the high-temperature β-quartz, both of which are chiral. The transformation from α-quartz to β-quartz takes place abruptly at . Since the transformation is accompanied by a significant change in volume, it can easily induce microfracturing of ceramics or rocks passing through this temperature threshold. There are many different varieties of quartz, several of which are classified as gemstones. Since antiquity, varieties of quartz have been the most commonly used minerals in the making of jewelry and hardstone carvings, especially in Eurasia. Quartz is the mineral defining the val ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
South Barrule
The South Barrule ( gv, Baarool Jiass) is the highest hill in the south of the Isle of Man. It has the remains of a fort on its summit, which is traditionally the home of the Manx god of the sea Mannanan beg mac y Leir. The hill is largely surrounded by conifer plantations. On the south western slope of the hill the Cringle Reservoir was formed to supply water to the southern part of the island. South Barrule's ancient name was ''Warfield'' or ''Wardfell''. A short, straight footpath links the summit with a small known as the Round Table, through which pass the [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
North Barrule
North Barrule ( gv, Baarool Twoaie ; on, varŏa-fjall, lookout or cairn mountain) is the second highest peak in the Isle of Man at . From the summit the northern plain of the Isle of Man can be viewed along with the coastlines of Ireland, Cumbria, Wales and Scotland. North Barrule is located at OS grid reference SC442909 and forms the north-eastern end of a ridge. It forms the boundary between the parishes of Lezayre and Maughold. Climbing North Barrule The summit of the North Barrule can be attained by a rough hill walk with no need for technical climbing or , although certain routes to the summit do provide the possibility for either. According to the Isle of Man commu ...[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Snaefell
Snaefell ( on, snjœ-fjall/snjó-fall – snow mountain) – ( gv, Sniaull) is the highest mountain and the only summit higher than on the Isle of Man, at above sea level. The summit is crowned by a railway station, cafe and several communications masts. Views It is a well-known saying in the Isle of Man that on a clear day six kingdoms can be seen from the top: the Isle of Man, England, Ireland, Scotland, Wales and Heaven. Some versions add a seventh kingdom, that of Manannán (or the sea). The plaque at the summit indicates the directions of five points from Snaefell as well as their distances: * to the Mull of Galloway (Scotland) * to Scafell (England) * to the Mountains of Mourne (Northern Ireland) * to Liverpool (England) * to Dublin (Republic of Ireland) (For some reason, Wales is absent from the plaque). While highly dependent on weather conditions and visibility, all of the four countries of the United Kingdom can be seen from the summit of Snaefell. This i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Peel Castle
Peel Castle (''Cashtal Phurt ny h-Inshey'' in Manx Gaelic) is a castle in Peel, Isle of Man, Peel on the Isle of Man, originally constructed by Vikings. The castle stands on St Patrick's Isle which is connected to the town by a causeway. It is now owned by Manx National Heritage and is open to visitors during the summer. The castle was built in the 11th century by the Vikings, under the rule of King Magnus II of the Isle of Man, Magnus Barefoot. While there were older stone Celtic monastery, monastic buildings on the island, the first Viking fortifications were built of wood. The prominent Irish round tower, round tower was originally part of the Celtic monastery, but had battlements added at a later date. In the early 14th century, the majority of the walls and towers were built primarily from local red sandstone, which is found abundantly in the area. After the rule of the Vikings, the castle continued to be used by the Church due to the Peel Cathedral, cathedral built there & ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Peel, Isle Of Man
Peel ( gv, Purt ny h-Inshey – Port of the Island) is a seaside town and small fishing port in the Isle of Man, in the historic parish of German but administered separately. Peel is the third largest town in the island after Douglas and Ramsey but the fourth largest settlement, as Onchan has the second largest population but is classified as a village. Until 2016 (when it was merged with Glenfaba) Peel was also a House of Keys constituency, electing one Member of the House of Keys (MHK), who, from September 2015, was Ray Harmer. Peel has a ruined castle on St Patrick's Isle, and a cathedral, seat of the Diocese of Sodor and Man (the diocese was founded when Mann was ruled by the Norse). Geography Peel is on the west coast of the Isle of Man, on the east side of the mouth of the River Neb. To the north west is St Patrick's Isle, connected to the mainland by a causeway, and to the west across the river is Peel Hill. The A1 road connects Peel with Douglas. The A4 and A3 roads c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Microgabbro
Diabase (), also called dolerite () or microgabbro, is a mafic, holocrystalline, subvolcanic rock equivalent to volcanic basalt or plutonic gabbro. Diabase dikes and sills are typically shallow intrusive bodies and often exhibit fine-grained to aphanitic chilled margins which may contain tachylite (dark mafic glass). ''Diabase'' is the preferred name in North America, while ''dolerite'' is the preferred name in the rest of the English-speaking world, where sometimes the name ''diabase'' refers to altered dolerites and basalts. Some geologists prefer to avoid confusion by using the name ''microgabbro''. The name ''diabase'' comes from the French ', and ultimately from the Greek - meaning "act of crossing over, transition". Petrography Diabase normally has a fine but visible texture of euhedral lath-shaped plagioclase crystals (62%) set in a finer matrix of clinopyroxene, typically augite (20–29%), with minor olivine (3% up to 12% in olivine diabase), magnetite (2%), a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Metamorphism
Metamorphism is the transformation of existing rock (the protolith) to rock with a different mineral composition or texture. Metamorphism takes place at temperatures in excess of , and often also at elevated pressure or in the presence of chemically active fluids, but the rock remains mostly solid during the transformation. Metamorphism is distinct from weathering or diagenesis, which are changes that take place at or just beneath Earth's surface. Various forms of metamorphism exist, including regional, contact, hydrothermal, shock, and dynamic metamorphism. These differ in the characteristic temperatures, pressures, and rate at which they take place and in the extent to which reactive fluids are involved. Metamorphism occurring at increasing pressure and temperature conditions is known as ''prograde metamorphism'', while decreasing temperature and pressure characterize ''retrograde metamorphism''. Metamorphic petrology is the study of metamorphism. Metamorphic petrologists re ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
