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Portland Raised Beach
Portland Raised Beach refers to small raised beaches on each side of Portland Bill, on the Isle of Portland, part of the Jurassic Coast in Dorset, England. The main one is known as the West Pleistocene Raised Beach; nearby is the East Pleistocene Raised Beach. They exhibit multi-type erosion and deposition during a warm spell in the last Ice Age in the inter-tidal zone show signs of tide and wave impact during more recent millennia. For some depth, sandy and shelly pebbles predominate. A factor in the higher than average speed shore erosion is the weight of the ice which covered the north of Britain and beyond in the colder spells that caused the British Isles landmass to tilt (see post-glacial rebound) and prevailing south-west currents and breeze, a pace which results in the relatively little water-eroded cliff-based fossils, stones and pebbles along Chesil Beach. Tidally caught fine material (sand) is deposited on most great bays facing the deeper western half or so of the En ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Portland Raised Beach, Portland Bill
Portland most commonly refers to: * Portland, Oregon, the largest city in the state of Oregon, in the Pacific Northwest region of the United States * Portland, Maine, the largest city in the state of Maine, in the New England region of the northeastern United States * Isle of Portland, England, a tied island in the English Channel Portland may also refer to: Places and establishments Australia *Cape Portland, Tasmania, a cape on the north-eastern tip of Tasmania *Portland, New South Wales, a town with the first Australian cement works *Portland, Victoria, a regional city and port *City of Portland (Victoria), a former local government area (LGA) Canada *Port Lands, Toronto, Ontario (sometimes mistakenly spelled "Portlands"), the eastern part of the Toronto waterfront *Portland Island (British Columbia), a small island off the coast of Vancouver island *Portland Inlet, an inlet between southeastern Alaska and British Columbia **Portland Canal, an arm of Portland Inlet *Portland Es ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Portland Bill Lighthouse
Portland Bill Lighthouse is a functioning lighthouse at Portland Bill, on the Isle of Portland, Dorset, England. The lighthouse and its boundary walls are Grade II Listed. As Portland Bill's largest and most recent lighthouse, the Trinity House operated Portland Bill Lighthouse is distinctively white and red striped, standing at a height of . It was completed by 1906 and first shone out on 11 January 1906. The lighthouse guides passing vessels through the hazardous waters surrounding the Bill, while also acting as a waymark for ships navigating the English Channel. History The two original lighthouses, now known as the Old Higher Lighthouse and Old Lower Lighthouse, operated as a pair of leading lights to guide ships between Portland Race and The Shambles sandbank. They were constructed in 1716, both rebuilt in 1869, and decommissioned following the completion of the present lighthouse. At the turn of the 20th-century, Trinity House put forward plans for building a new lig ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cryoturbation
In gelisols (permafrost soils), cryoturbation (frost churning) refers to the mixing of materials from various horizons of the soil down to the bedrock due to freezing and thawing. Cryoturbation occurs to varying degrees in most gelisols. The cause of cryoturbation lies in the way in which the repeated freezing of the soil during autumn causes the formation of ice wedges at the most easily erodible parts of the parent rock. If the parent rock is hard, this can cause quite deep erosion of the rock over many years. As this process continues, during the summer when an active layer forms in the soil this eroded material can easily move both from the soil surface downward and from the permafrost table upward. As this process occurs, the upper soil material gradually dries out (because the soil moisture moves from the warm surface layer to the colder layer at the top of the permafrost) so that it forms a granular structure with many very distinctive crystalline shapes (such as ice lenses ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Littorina
''Littorina'' is a genus of small sea snails, marine gastropod molluscs in the family Littorinidae, the winkles or periwinkles.WoRMS (2011). Littorina Férussac, 1822. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=138135 on 2011-04-15 These small snails live in the tidal zone of rocky shores. Overview In Europe there are about nine species in this genus, one of which is the rough periwinkle, ''Littorina saxatilis'' (Olivi, 1792). Another closely related (supposed) species ''Littorina tenebrosa'' (Montagu 1802) was thought to be distinct because of its different ecological requirements, but current studies have shown that it is not at all clear whether the two are indeed separate species or whether ''L. tenebrosa'' is perhaps merely an ecotype (an ecological form) of ''L. saxatilis''.Gosling, E.M. (2002). ''The periwinkle as a model in biodiversity studies: a geneticist's view.'' in Marine Biodiversity in Ireland and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Patella (gastropod)
''Patella'' is a genus of sea snails with gills, typical true limpets, marine gastropod mollusks in the family Patellidae, the true limpets. ''Patella'' is the type genus of the family Patellidae. Species Species within the genus ''Patella'' include: * † '' Patella alessiae'' Forli, Dell'Angelo, Montagna & Taviani, 2004 * † '' Patella alternicostata'' Sandberger, 1859 * † ''Patella ambroggii'' Lecointre, 1952 * †'' Patella amuritica'' Wilckens, 1922 * '' Patella argentaurum'' Lesson, 1831 (status in recent literature not researched by editor) * '' Patella aspera'' Röding, 1798 * ''Patella caerulea'' Linnaeus, 1758 * ''Patella candei'' d'Orbigny, 1839 * ''Patella crocata'' R.P. Lesson, 1831 * ''Patella cyanea'' R.P. Lesson, 1831 * ''Patella depressa'' Pennant, 1777 - ''Patella depressa'' is a nomen dubium according to Christiaens (1973, 1983); ''Patella intermedia'' gets priority. Nevertheless the name ''Patella depressa'' is in usage among British authors (e.g. Gr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cave Hole, Portland
Cave Hole is a large cave on the south east side of the Isle of Portland, a large peninsular in Dorset, England. It has a blowhole and a wooden crane, known as Broad Ope Crane on the cliff top. It is north-east of Portland Bill, has an interior measuring square and high. Cave Hole was earlier known as Keeve's Hole and regularly featured in recorded history and wider lore of smuggling. It is made up of a series of caves with steep roof sections, tunnels and ledges, and represents the first stage in cave collapse. The cave and its surrounding area is frequently used for deep-water soloing. The cave's blowhole, which stretches far into the solid rock, was formed when the roof of the cave was broken through to the surface. For the protection of people looking down into the cave, an iron grill has been installed across it. Whenever a powerful easterly gale occurs, the sea shoots up through the fissures. Various small craft have been driven into the cave by east and south easterl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ministry Of Defence Magnetic Range, Portland
Ministry may refer to: Government * Ministry (collective executive), the complete body of government ministers under the leadership of a prime minister * Ministry (government department), a department of a government Religion * Christian ministry, activity by Christians to spread or express their faith ** Minister (Christianity), clergy authorized by a church or religious organization to perform teaching or rituals ** Ordination, the process by which individuals become clergy * Ministry of Jesus, activities described in the Christian gospels * ''Ministry'' (magazine), a magazine for pastors published by the Seventh-day Adventist Church Music * Ministry (band), an American industrial metal band * Ministry of Sound, a London nightclub and record label Fiction * Ministry (comics), a horror comic book created by writer-artist Lara J. Phillips * Ministry of Magic, governing body in the ''Harry Potter'' series * Ministry of Darkness, a professional wrestling stable led by Th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pulpit Rock (Isle Of Portland)
Pulpit Rock is a coastal feature at Portland Bill, the southern tip of the Isle of Portland, Dorset, England. Intended to have the appearance of an open bible leaning on a pulpit, Pulpit Rock was formed in the 1870s after a natural arch was cut away by quarrymen at Bill Quarry, and the leaning slab was added. As a quarrying relic, the rock is similar to that of Nicodemus Knob, another quarrying landmark on the island. Pulpit Rock has become a popular tourist attraction on the island and is often photographed. Despite the danger, for many decades it has been a popular place for tombstoning. Pulpit Rock is also a popular point for wrasse anglers. The British record Ballan wrasse was caught there in 1998 by Pete Hegg. The geological succession up from sea level is: Portland Cherty Series (up to the level of the neighbouring quarried platform), then Portland Freestone (the oolitic limestone quarried inland of Pulpit Rock), then a cap of thin-bedded limestones which are part of th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
English Channel
The English Channel, "The Sleeve"; nrf, la Maunche, "The Sleeve" (Cotentinais) or ( Jèrriais), (Guernésiais), "The Channel"; br, Mor Breizh, "Sea of Brittany"; cy, Môr Udd, "Lord's Sea"; kw, Mor Bretannek, "British Sea"; nl, Het Kanaal, "The Channel"; german: Ärmelkanal, "Sleeve Channel" ( French: ''la Manche;'' also called the British Channel or simply the Channel) is an arm of the Atlantic Ocean that separates Southern England from northern France. It links to the southern part of the North Sea by the Strait of Dover at its northeastern end. It is the busiest shipping area in the world. It is about long and varies in width from at its widest to at its narrowest in the Strait of Dover."English Channel". ''The Columbia Encyclopedia'', 2004. It is the smallest of the shallow seas around the continental shelf of Europe, covering an area of some . The Channel was a key factor in Britain becoming a naval superpower and has been utilised by Britain as a natural def ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Portland Bill Raised Beach, Dorset
Portland most commonly refers to: * Portland, Oregon, the largest city in the state of Oregon, in the Pacific Northwest region of the United States * Portland, Maine, the largest city in the state of Maine, in the New England region of the northeastern United States * Isle of Portland, England, a tied island in the English Channel Portland may also refer to: Places and establishments Australia *Cape Portland, Tasmania, a cape on the north-eastern tip of Tasmania *Portland, New South Wales, a town with the first Australian cement works *Portland, Victoria, a regional city and port *City of Portland (Victoria), a former local government area (LGA) Canada *Port Lands, Toronto, Ontario (sometimes mistakenly spelled "Portlands"), the eastern part of the Toronto waterfront *Portland Island (British Columbia), a small island off the coast of Vancouver island *Portland Inlet, an inlet between southeastern Alaska and British Columbia **Portland Canal, an arm of Portland Inlet *Portland Es ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chesil Beach
Chesil Beach (also known as Chesil Bank) in Dorset, England is one of three major shingle beach structures in Britain.A. P. Carr and M. W. L. Blackley, "Investigations Bearing on the Age and Development of Chesil Beach, Dorset, and the Associated Area" ''Transactions of the Institute of British Geographers'', No. 58 (March 1973) pp. 99-111. Its name is derived from the Old English or , meaning "gravel" or "shingle". It runs for a length of from West Bay to the Isle of Portland and in places is up to high and wide. Behind the beach is the Fleet, a shallow tidal lagoon. Both are part of the Jurassic Coast and a UNESCO World Heritage Site, and together form an SSSI and Ramsar Site. The beach is often identified as a tombolo, although research into the geomorphology of the area has revealed that it is in fact a barrier beach which has "rolled" landwards, joining the mainland with the Isle of Portland and giving the appearance of a tombolo. The beach curves sharply at the east ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Post-glacial Rebound
Post-glacial rebound (also called isostatic rebound or crustal rebound) is the rise of land masses after the removal of the huge weight of ice sheets during the last glacial period, which had caused isostatic depression. Post-glacial rebound and isostatic depression are phases of glacial isostasy (glacial isostatic adjustment, glacioisostasy), the deformation of the Earth's crust in response to changes in ice mass distribution. The direct raising effects of post-glacial rebound are readily apparent in parts of Northern Eurasia, Northern America, Patagonia, and Antarctica. However, through the processes of ''ocean siphoning'' and ''continental levering'', the effects of post-glacial rebound on sea level are felt globally far from the locations of current and former ice sheets.Milne, G.A., and J.X. Mitrovica (2008) ''Searching for eustasy in deglacial sea-level histories.'' Quaternary Science Reviews. 27:2292–2302. Overview During the last glacial period, much of northern Eu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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