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Gurney Slade Quarry
Gurney Slade quarry, is a limestone quarry near Gurney Slade between Binegar and Holcombe, on the Mendip Hills, Somerset, England. Gurney Slade quarry exhibits pale to very dark grey Carboniferous Limestone overlain by red and purple-coloured Triassic breccias and marls with a small faulted block of overlying Lower Jurassic breccias forming an angular unconformity with the Carboniferous Limestone. There is abundant vertical sediment infilled fissures and joints ( Neptunian Dykes). The rocks contain varying amounts of calcite mineralization, and there is common fossil material associated with the Carboniferous and Jurassic limestones. The limestone within the quarry dips to the south-east at around 30°. Work began at the quarry in the mid 18th century and grew after it was taken over by Francis Flower and Sons in 1928 producing stone for lime-burning. The quarry closed in 1947 and was reopened in 1951 by John Yeoman of Foster Yeoman. The next owner was City Sand and Gravel Co. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gurney Slade Quarry
Gurney Slade quarry, is a limestone quarry near Gurney Slade between Binegar and Holcombe, on the Mendip Hills, Somerset, England. Gurney Slade quarry exhibits pale to very dark grey Carboniferous Limestone overlain by red and purple-coloured Triassic breccias and marls with a small faulted block of overlying Lower Jurassic breccias forming an angular unconformity with the Carboniferous Limestone. There is abundant vertical sediment infilled fissures and joints ( Neptunian Dykes). The rocks contain varying amounts of calcite mineralization, and there is common fossil material associated with the Carboniferous and Jurassic limestones. The limestone within the quarry dips to the south-east at around 30°. Work began at the quarry in the mid 18th century and grew after it was taken over by Francis Flower and Sons in 1928 producing stone for lime-burning. The quarry closed in 1947 and was reopened in 1951 by John Yeoman of Foster Yeoman. The next owner was City Sand and Gravel Co. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Breccia
Breccia () is a rock composed of large angular broken fragments of minerals or rocks cemented together by a fine-grained matrix. The word has its origins in the Italian language, in which it means "rubble". A breccia may have a variety of different origins, as indicated by the named types including sedimentary breccia, tectonic breccia, igneous breccia, impact breccia, and hydrothermal breccia. A megabreccia is a breccia composed of very large rock fragments, sometimes kilometers across, which can be formed by landslides, impact events, or caldera collapse. Types Breccia is composed of coarse rock fragments held together by cement or a fine-grained matrix. Like conglomerate, breccia contains at least 30 percent of gravel-sized particles (particles over 2mm in size), but it is distinguished from conglomerate because the rock fragments have sharp edges that have not been worn down. These indicate that the gravel was deposited very close to its source area, since otherwise th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Foster Yeoman
Foster Yeoman Limited, based near Frome, Somerset, England, was one of Europe's largest independent quarrying and asphalt companies. It was sold to Aggregate Industries in 2006. History The company was founded by Foster Yeoman, from Hartlepool, at Dulcote, near Wells, in 1923. He was a former ship owner and had worked in the iron and steel business. Yeoman had served in the First World War and went into quarrying to provide employment for ex-soldiers. Between the wars Foster Yeoman Limited supplied contractors and local authorities in the South of England, reaching an early peak of prosperity in the 1930s. During the Second World War, the firm supplied materials for the construction of airfields. Most stone was sent away by rail as it is today. After the war, with Foster Yeoman ailing, business declined and the company came full circle, returning to the £20,000 turnover it had enjoyed in 1923. In 1949, Foster died and his son, John Foster Yeoman, became a managing director at ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Neptunian Dykes
Neptune was discovered in 1846 and has only made occasional appearances in fiction since then. The first time it was mentioned, then called "Leverrier's planet", was in the 1848 novel '' The Triumphs of Woman'' by Charles Rowcroft where an inhabitant of the planet visits Earth. The earliest stories where Neptune itself directly appears as a setting, such as the 1930s works " The Monsters of Neptune" by Henrik Dahl Juve and ''Last and First Men'' by Olaf Stapledon, portray it as a rocky planet rather than as having its actual gaseous composition; in the latter, it becomes humanity's refuge in the far future when the Sun expands. Later works rectified this error, with Alexei Panshin's 1969 short story " One Sunday in Neptune" depicting a voyage into Neptune's atmosphere and Alex Irvine's 2003 story " Shepherded by Galatea" featuring resource extraction in the atmosphere. In the 1969 novel '' Macroscope'' by Piers Anthony, Neptune is converted to a world ship. Neptune's largest moon ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fissures
A fissure is a long, narrow crack opening along the surface of Earth. The term is derived from the Latin word , which means 'cleft' or 'crack'. Fissures emerge in Earth's crust, on ice sheets and glaciers, and on volcanoes. Ground fissure A , also called an , is a long, narrow crack or linear opening in the Earth's crust. Ground fissures can form naturally, such as from tectonic faulting and earthquakes, or as a consequence of human activity, such as oil mining and groundwater pumping. Once formed, ground fissures can be extended and eroded by torrential rain. They can be hazardous to people and livestock living on the affected surfaces and damaging to property and infrastructure, such as roads, underground pipes, canals, and dams. In circumstances where there is the extensive withdrawal of groundwater, the earth above the water table can subside causing fissures to form at the surface. This typically occurs at the floor of arid valleys having rock formations and compacted ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Unconformity
An unconformity is a buried erosional or non-depositional surface separating two rock masses or strata of different ages, indicating that sediment deposition was not continuous. In general, the older layer was exposed to erosion for an interval of time before deposition of the younger layer, but the term is used to describe any break in the sedimentary geologic record. The significance of angular unconformity (see below) was shown by James Hutton, who found examples of Hutton's Unconformity at Jedburgh in 1787 and at Siccar Point in 1788. The rocks above an unconformity are younger than the rocks beneath (unless the sequence has been overturned). An unconformity represents time during which no sediments were preserved in a region or were subsequently eroded before the next deposition. The local record for that time interval is missing and geologists must use other clues to discover that part of the geologic history of that area. The interval of geologic time not represented is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lower Jurassic
The Early Jurassic Epoch (in chronostratigraphy corresponding to the Lower Jurassic Series) is the earliest of three epochs of the Jurassic Period. The Early Jurassic starts immediately after the Triassic-Jurassic extinction event, 201.3 Ma (million years ago), and ends at the start of the Middle Jurassic 174.1 Ma. Certain rocks of marine origin of this age in Europe are called "Lias" and that name was used for the period, as well, in 19th-century geology. In southern Germany rocks of this age are called Black Jurassic. Origin of the name Lias There are two possible origins for the name Lias: the first reason is it was taken by a geologist from an English quarryman's dialect pronunciation of the word "layers"; secondly, sloops from north Cornish ports such as Bude would sail across the Bristol Channel to the Vale of Glamorgan to load up with rock from coastal limestone quarries (lias limestone from South Wales was used throughout North Devon/North Cornwall as it con ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Marl
Marl is an earthy material rich in carbonate minerals, clays, and silt. When hardened into rock, this becomes marlstone. It is formed in marine or freshwater environments, often through the activities of algae. Marl makes up the lower part of the cliffs of Dover, and the Channel Tunnel follows these marl layers between France and the United Kingdom. Marl is also a common sediment in post-glacial lakes, such as the marl ponds of the northeastern United States. Marl has been used as a soil conditioner and neutralizing agent for acid soil and in the manufacture of cement. Description Marl or marlstone is a carbonate-rich mud or mudstone which contains variable amounts of clays and silt. The term was originally loosely applied to a variety of materials, most of which occur as loose, earthy deposits consisting chiefly of an intimate mixture of clay and calcium carbonate, formed under freshwater conditions. These typically contain 35–65% clay and 65–35% carbonate. The te ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Triassic
The Triassic ( ) is a geologic period and system which spans 50.6 million years from the end of the Permian Period 251.902 million years ago ( Mya), to the beginning of the Jurassic Period 201.36 Mya. The Triassic is the first and shortest period of the Mesozoic Era. Both the start and end of the period are marked by major extinction events. The Triassic Period is subdivided into three epochs: Early Triassic, Middle Triassic and Late Triassic. The Triassic began in the wake of the Permian–Triassic extinction event, which left the Earth's biosphere impoverished; it was well into the middle of the Triassic before life recovered its former diversity. Three categories of organisms can be distinguished in the Triassic record: survivors from the extinction event, new groups that flourished briefly, and other new groups that went on to dominate the Mesozoic Era. Reptiles, especially archosaurs, were the chief terrestrial vertebrates during this time. A specialized subgroup of archo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Limestone
Limestone ( calcium carbonate ) is a type of carbonate sedimentary rock which is the main source of the material lime. It is composed mostly of the minerals calcite and aragonite, which are different crystal forms of . Limestone forms when these minerals precipitate out of water containing dissolved calcium. This can take place through both biological and nonbiological processes, though biological processes, such as the accumulation of corals and shells in the sea, have likely been more important for the last 540 million years. Limestone often contains fossils which provide scientists with information on ancient environments and on the evolution of life. About 20% to 25% of sedimentary rock is carbonate rock, and most of this is limestone. The remaining carbonate rock is mostly dolomite, a closely related rock, which contains a high percentage of the mineral dolomite, . ''Magnesian limestone'' is an obsolete and poorly-defined term used variously for dolomite, for limes ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carboniferous
The Carboniferous ( ) is a geologic period and system of the Paleozoic that spans 60 million years from the end of the Devonian Period million years ago ( Mya), to the beginning of the Permian Period, million years ago. The name ''Carboniferous'' means "coal-bearing", from the Latin '' carbō'' ("coal") and '' ferō'' ("bear, carry"), and refers to the many coal beds formed globally during that time. The first of the modern 'system' names, it was coined by geologists William Conybeare and William Phillips in 1822, based on a study of the British rock succession. The Carboniferous is often treated in North America as two geological periods, the earlier Mississippian and the later Pennsylvanian. Terrestrial animal life was well established by the Carboniferous Period. Tetrapods (four limbed vertebrates), which had originated from lobe-finned fish during the preceding Devonian, became pentadactylous in and diversified during the Carboniferous, including early amphibian line ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
England
England is a country that is part of the United Kingdom. It shares land borders with Wales to its west and Scotland to its north. The Irish Sea lies northwest and the Celtic Sea to the southwest. It is separated from continental Europe by the North Sea to the east and the English Channel to the south. The country covers five-eighths of the island of Great Britain, which lies in the North Atlantic, and includes over 100 smaller islands, such as the Isles of Scilly and the Isle of Wight. The area now called England was first inhabited by modern humans during the Upper Paleolithic period, but takes its name from the Angles, a Germanic tribe deriving its name from the Anglia peninsula, who settled during the 5th and 6th centuries. England became a unified state in the 10th century and has had a significant cultural and legal impact on the wider world since the Age of Discovery, which began during the 15th century. The English language, the Anglican Church, and Engli ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
