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Purbeck Limestone
Purbeck Marble is a fossiliferous limestone found in the Isle of Purbeck, a peninsula in south-east Dorset, England. It is a variety of Purbeck stone that has been quarried since at least Roman times as a decorative building stone. Geology Stratigraphically these limestone beds lie towards the top of the Durlston Formation of the Purbeck Group. They were deposited during the Berriasian age of the Early Cretaceous epoch. Purbeck Marble is not a metamorphic rock, like a true marble, but is so-called because it can take a fine polish. Its characteristic appearance comes from densely packed shells of the freshwater snail ''Viviparus''. Sussex Marble is similar in type. The 'marble' is properly classified as a biomicrudite, as it consists of large clasts (the snail shells) in a fine-grained limestone mud matrix. The individual marble beds (also known as 'seams'), lie between layers of softer marine clays and mudstone, laid down during repeated marine ingressions. Some of the beds ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fossiliferous Limestone
Fossiliferous limestone is a type of limestone that contains noticeable quantities of fossils or trace fossil, fossil traces. If a particular type of fossil dominates, a more specialized term can be used as in "Ames Limestone, Crinoidal", "Coralline", "Conchoidal" limestone. If seashells, shell fragments, and shell sand form a significant part of the rock, a term "shell limestone" is used. The fossils in these rocks may be of macroscopic or microscopic size. The sort of macroscopic fossils often include crinoid stems, brachiopods, gastropods, and other hard shelled mollusk remains. In some cases, microfossils such as siliceous diatom shells in deposition may convert over time to opal and chert, providing the only inferred evidence of bioactivity preserved in limestone. Fossiliferous limestone is termed biosparite under the Folk classification of sedimentary rocks. Lagerstätte are a class of fossil bearing rocks that includes fossiliferous limestone. Use Fossils in general pr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rudite
Rudite is a general name used for a sedimentary rock composed of rounded or angular detrital grains, i.e. granules, pebbles, cobbles, and boulders, which are coarser than sand in size. Rudites include sedimentary rocks composed of both siliciclastic, i.e. conglomerate and breccia, and carbonate grains, i.e. calcirudite and rudstone. This term is equivalent to the Greek-derived term, psephite. Rudite was initially proposed by GrabauGrabau, A.W. (1904) ''On the classification of sedimentary rocks.'' American Geologist. vol. 33, pp. 228-247. as "rudyte". It is derived from the Latin word ''rudus'' for "crushed stone", "rubbish", "debris", and "rubble".U.S. Bureau of Mines Staff (1996) ''Dictionary of Mining, Mineral, & Related Terms.'' Report SP-96-1, U.S. Department of Interior, U.S. Bureau of Mines, Washington, D.C.Neuendorf, K.K.E., J.P. Mehl, Jr., and J.A. Jackson, J.A., eds. (2005) ''Glossary of Geology'' (5th ed.). Alexandria, Virginia, American Geological Institute. 779 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Molding (decorative)
Moulding (British English), or molding (American English), also coving (in United Kingdom, Australia), is a strip of material with various profiles used to cover transitions between surfaces or for decoration. It is traditionally made from solid milled wood or plaster, but may be of plastic or reformed wood. In classical architecture and sculpture, the moulding is often carved in marble or other stones. In historic architecture, and some expensive modern buildings, it may be formed in place with plaster. A "plain" moulding has right-angled upper and lower edges. A "sprung" moulding has upper and lower edges that bevel towards its rear, allowing mounting between two non-parallel planes (such as a wall and a ceiling), with an open space behind. Mouldings may be decorated with paterae as long, uninterrupted elements may be boring for eyes. Types Decorative mouldings have been made of wood, stone and cement. Recently mouldings have been made of extruded polyvinyl chl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Romano-British
The Romano-British culture arose in Britain under the Roman Empire following the Roman conquest in AD 43 and the creation of the province of Britannia. It arose as a fusion of the imported Roman culture with that of the indigenous Britons, a people of Celtic language and custom. Scholars such as Christopher Snyder believe that during the 5th and 6th centuries – approximately from 410 when the Roman legions withdrew, to 597 when St Augustine of Canterbury arrived – southern Britain preserved an active sub-Roman culture that survived the attacks from the Anglo-Saxons and even used a vernacular Latin when writing. Arrival of the Romans Roman troops, mainly from nearby provinces, invaded in AD 43, in what is now part of England, during the reign of Emperor Claudius. Over the next few years the province of Britannia was formed, eventually including the whole of what later became England and Wales and parts of Scotland.Kinder, H. & Hilgemann W. ''The Penguin Atlas of Wo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Langton Matravers
Langton Matravers () is a village and civil parish on the Isle of Purbeck, in the county of Dorset in the south of England. It is situated about west of Swanage town centre and south-east of Corfe Castle. In the 2011 Census the civil parish had 381 households and a population of 853. History The name Langton stems from "long town", and is first attested in 1206, as ''Langeton''. Matravers stems from the name of John Mautravers who owned the land there in 1281, and ultimately originates from the French "mal traverse". The Old Malthouse was a preparatory school for boys and, more recently, girls which was founded in 1906, but closed in 2007. Two other preparatory schools Durnford School and Spyway used to be located in the village. Both Durnford and Spyway were closed earlier; Ian Fleming, author of the James Bond novels, was educated at Durnford. On 2 November 2022, the Ordnance Survey (OS) announced that the historic triple alignment of true, magnetic and grid north had mad ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cist
In archeology, a cist (; also kist ; ultimately from ; cognate to ) or cist grave is a small stone-built coffin-like box or ossuary used to hold the bodies of the dead. In some ways, it is similar to the deeper shaft tomb. Examples occur across Europe and in the Middle East. A cist may have formerly been associated with other monuments, perhaps under a cairn or a long barrow. Several cists are sometimes found close together within the same cairn or barrow. Often ornaments have been found within an excavated cist, indicating the wealth or prominence of the interred individual. This old word is preserved in the Nordic languages as in Swedish and in Danish and Norwegian, where it is the word for a funerary coffin. In English the term is related to ''cistern'' and to ''chest''. Regional examples ;England * Teffont Evias, England ;Estonia * Jõelähtme (Rebala) stone-cist graves, Harju County ;Guatemala * Mundo Perdido, Tikal, Petén Department ;Ireland * Knockm ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bronze Age
The Bronze Age () was a historical period characterised principally by the use of bronze tools and the development of complex urban societies, as well as the adoption of writing in some areas. The Bronze Age is the middle principal period of the three-age system, following the Stone Age and preceding the Iron Age. Conceived as a global era, the Bronze Age follows the Neolithic, with a transition period between the two known as the Chalcolithic. The final decades of the Bronze Age in the Mediterranean basin are often characterised as a period of widespread societal collapse known as the Late Bronze Age collapse (), although its severity and scope are debated among scholars. An ancient civilisation is deemed to be part of the Bronze Age if 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 producing areas elsewhere. Bronze Age cultures were the first to History of writing, develop writin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Peveril Point
Peveril Point is a headland on the east-facing coast of the Isle of Purbeck in Dorset, England, and is part of the town of Swanage. It forms the southern end of Swanage Bay. It is located at OS Grid Ref: SZ 041 787. The rocks that make up Peveril Point are shale and Portland and Purbeck limestone in a syncline structure. This has resisted erosion more than the adjacent clay of Swanage Bay; whilst the clay has eroded away over time, the limestone has remained as a headland. On top of Peveril Point is a National Coastwatch Institution lookout. The point is also home to Swanage Lifeboat Station. Ward, Lock and Company, ltd, & Hammond, R. J. W. (1974). ''Complete England''. London: Ward Lock, p. 94. Peveril Point contains tunnels connecting disused gun emplacements which defended the entrance to Southampton Water from the west of the Isle of Wight during World War II World War II or the Second World War (1 September 1939 – 2 September 1945) was a World war, gl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Worbarrow Tout
Worbarrow Tout is a promontory at the eastern end of Worbarrow Bay on Isle of Purbeck in Dorset on the south coast of England, about south of Wareham and about west of Swanage. Immediately to its east is Pondfield Cove. Worbarrow Tout ("tout" means lookout) was originally part of Gad Cliff to its east, but sea erosion has virtually separated the two completely. Geology The Tout has a distinct pointed shape. It has steep angular layers of rock that visibly demonstrate the complex sedimentary folding that affected this area and that were caused by tectonic pressures as the African and European continents collided some 30 million years ago. The cliff sediments were then twisted horizontally and this is why the Chalks that are between 85 and 145 million years old are found at the rear of the bay. The sediments that face the sea at the front of the bay and form the peninsula Worbarrow Tout are the 150-million-year-old Portland limestones and 147-million-year-old Purbeck Beds. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Outcrop
An outcrop or rocky outcrop is a visible exposure of bedrock or ancient superficial deposits on the surface of the Earth and other terrestrial planets. Features Outcrops do not cover the majority of the Earth's land surface because in most places the bedrock or superficial deposits are covered by soil and vegetation and cannot be seen or examined closely. However, in places where the overlying cover is removed through erosion or tectonic uplift, the rock may be exposed, or ''crop out''. Such exposure will happen most frequently in areas where erosion is rapid and exceeds the weathering rate such as on steep hillsides, mountain ridges and tops, river banks, and tectonically active areas. In Finland, glacial erosion during the last glacial maximum (ca. 11000 BC), followed by scouring by sea waves, followed by isostatic uplift has produced many smooth coastal and littoral outcrops. Bedrock and superficial deposits may also be exposed at the Earth's surface due to human exca ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Glauconite
Glauconite is an iron potassium phyllosilicate ( mica group) mineral of characteristic green color which is very friable and has very low weathering resistance. It crystallizes with a monoclinic geometry. Its name is derived from the Greek () meaning 'bluish green', referring to the common blue-green color of the mineral; its sheen ( mica glimmer) and blue-green color. Its color ranges from olive green, black green to bluish green, and yellowish on exposed surfaces due to oxidation. In the Mohs scale it has a hardness of 2, roughly the same as gypsum. The relative specific gravity range is 2.4–2.95. It is normally found as dark green rounded concretions with the dimensions of a sand grain. It can be confused with chlorite (also of green color) or with a clay mineral. Glauconite has the chemical formula . Glauconite particles are one of the main components of greensand, glauconitic siltstone and glauconitic sandstone. Glauconite has been called a marl in an old and br ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
