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Black Mountain (Wales)
The Black Mountain (), is a mountain in the Black Mountains, Wales, Black Mountains. It is the only Marilyn (hill), Marilyn to fall exactly on the Wales, Welsh–England, English border, Powys and Herefordshire. Its parent peak, Waun Fach, lies to the west. Access The Black Mountain is the highest point on Hatterrall Ridge. Offa's Dyke Path passes along the ridge, more or less from south to north. A steeper path leads to the summit from near the former youth hostel in the Vale of Ewyas to the west. The summit is unmarked and, because of the very shallow gradients along the summit ridge, virtually impossible to determine ''in situ''. Open access to all the moorland here means that deviation from the paths is allowed. The ground is peaty and normally very wet even in good weather, especially on the highest ground. It is the highest summit in England south of Great Whernside in the Yorkshire Dales, even though higher neighbours are very close by in Wales. However, some List of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Offa's Dyke Path
Offa's Dyke Path () is a long-distance footpath loosely following the Wales–England border. Officially opened on 10 July 1971, by John Hunt, Baron Hunt, Lord Hunt, it is one of Britain's National Trails and draws hillwalking, walkers from throughout the world. About of the route either follows, or keeps close company with, the remnants of Offa's Dyke, an Earthworks (engineering), earthwork traditionally thought to have been constructed in the late 8th century on the orders of Offa of Mercia, King Offa of Mercia. Walking trail Traveling south to north, starting by the Severn Estuary at Sedbury, near Chepstow, and finishing at Prestatyn on the north coast, the walk will take an average walker roughly 12 days to complete. Roughly following the border in parts, and elsewhere the ancient monument of Offa's Dyke, as well as natural features such as the Hatterrall Ridge, the Dyke Path passes through a variety of landscapes. The route traces the eastern edge of the Black Mountai ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Parent Peak
In topography, prominence or relative height (also referred to as autonomous height, and shoulder drop in US English, and drop in British English) measures the height of a mountain or hill's summit relative to the lowest contour line encircling it but containing no higher summit within it. It is a measure of the independence of a summit. The key col ("saddle") around the peak is a unique point on this contour line and the ''parent peak'' (if any) is some higher mountain, selected according to various criteria. Definitions The prominence of a peak is the least drop in height necessary in order to get from the summit to any higher terrain. This can be calculated for a given peak in the following manner: for every path connecting the peak to higher terrain, find the lowest point on the path; the ''key col'' (or ''highest saddle'', or ''linking col'', or ''link'') is defined as the highest of these points, along all connecting paths; the prominence is the difference between the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Calcrete
Caliche () is a soil accumulation of soluble calcium carbonate at depth, where it precipitates and binds other materials—such as gravel, sand, clay, and silt. It occurs worldwide, in aridisol and mollisol soil orders—generally in arid or semiarid regions, including in central and western Australia, in the Kalahari Desert, in the High Plains of the western United States, in the Sonoran Desert, Chihuahuan Desert and Mojave Desert of North America, and in eastern Saudi Arabia at Al-Hasa. Caliche is also known as calcrete or kankar (in India). It belongs to the duricrusts. The term is borrowed from Spanish and is originally from the Latin word , meaning lime. Caliche is generally light-colored but can range from white to light pink to reddish-brown, depending on the minerals present. Caliche is a mark of older landscapes. It generally occurs on or very near the surface. Where caliche layers originate at some depth from the soil surface, intact landscapes and buried landsca ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Devonian
The Devonian ( ) is a period (geology), geologic period and system (stratigraphy), system of the Paleozoic era (geology), era during the Phanerozoic eon (geology), eon, spanning 60.3 million years from the end of the preceding Silurian period at million years ago (Megaannum, Ma), to the beginning of the succeeding Carboniferous period at Ma. It is the fourth period of both the Paleozoic and the Phanerozoic. It is named after Devon, South West England, where rocks from this period were first studied. The first significant evolutionary radiation of history of life#Colonization of land, life on land occurred during the Devonian, as free-spore, sporing land plants (pteridophytes) began to spread across dry land, forming extensive coal forests which covered the continents. By the middle of the Devonian, several groups of vascular plants had evolved leaf, leaves and true roots, and by the end of the period the first seed-bearing plants (Pteridospermatophyta, pteridospermatophyt ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Old Red Sandstone
Old Red Sandstone, abbreviated ORS, is an assemblage of rocks in the North Atlantic region largely of Devonian age. It extends in the east across Great Britain, Ireland and Norway, and in the west along the eastern seaboard of North America. It also extends northwards into Greenland and Svalbard. These areas were a part of the paleocontinent of Euramerica (Laurussia). In Britain it is a lithostratigraphic unit (a sequence of rock strata) to which stratigraphers accord supergroup status and which is of considerable importance to early paleontology. The presence of ''Old'' in the name is to distinguish the sequence from the younger New Red Sandstone which also occurs widely throughout Britain. Sedimentology The Old Red Sandstone describes a group of sedimentary rocks deposited in a variety of environments in the late Silurian, through the Devonian and into the earliest part of the Carboniferous. The body of rock, or facies, is dominated by terrigenous deposits and co ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mudstone
Mudstone, a type of mudrock, is a fine-grained sedimentary rock whose original constituents were clays or muds. Mudstone is distinguished from ''shale'' by its lack of fissility.Blatt, H., and R.J. Tracy, 1996, ''Petrology.'' New York, New York, W. H. Freeman, 2nd ed, 529 pp. The term ''mudstone'' is also used to describe carbonate rocks (limestone or dolomite) that are composed predominantly of carbonate mud. However, in most contexts, the term refers to siliciclastic mudstone, composed mostly of silicate minerals. The NASA Curiosity rover has found deposits of mudstone on Mars that contain organic substances such as propane, benzene and toluene. Definition There is not a single definition of mudstone that has gained general acceptance,Boggs 2006, p.143 though there is wide agreement that mudstones are fine-grained sedimentary rocks, composed mostly of silicate grains with a grain size less than . Individual grains this size are too small to be distinguished without a micros ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sandstone
Sandstone is a Clastic rock#Sedimentary clastic rocks, clastic sedimentary rock composed mainly of grain size, sand-sized (0.0625 to 2 mm) silicate mineral, silicate grains, Cementation (geology), cemented together by another mineral. Sandstones comprise about 20–25% of all sedimentary rocks. Most sandstone is composed of quartz or feldspar, because they are the most resistant minerals to the weathering processes at the Earth's surface. Like uncemented sand, sandstone may be imparted any color by impurities within the minerals, but the most common colors are tan, brown, yellow, red, grey, pink, white, and black. Because sandstone beds can form highly visible cliffs and other topography, topographic features, certain colors of sandstone have become strongly identified with certain regions, such as the red rock deserts of Arches National Park and other areas of the Southwestern United States, American Southwest. Rock formations composed of sandstone usually allow the p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Mountain Lists
Perhaps the first of what would become many notable mountain lists around the world was Sir Hugh Munro’s catalogue of the Munros, the peaks above 3,000’ elevation in Scotland. Once defined the list became a popular target for what became known as peak bagging, where the adventurous attempted to summit all of the peaks on the list. Over time the peaks on such lists grew more challenging, with perhaps the eight-thousanders as the most notable (the mentioned list being first fully completed by Reinhold Messner in 1986). Other extreme examples are the Seven Summits, defined as the highest peaks on each of the seven continents. An ever-growing collection of peak lists is maintained and published on mountaineering-related websites. Worldwide *The Eight-thousanders are the fourteen mountains over in height, all in the Himalaya and Karakoram ranges in Asia. *The Seven Summits are the highest peaks on each continent, from the Vinson Massif in Antarctica to Everest in Asia. * ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ordnance Survey National Grid
The Ordnance Survey National Grid reference system (OSGB), also known as British National Grid (BNG), is a system of geographic grid references, distinct from latitude and longitude, whereby any location in Great Britain can be described in terms of its distance from the origin (0, 0), which lies to the west of the Isles of Scilly. The Ordnance Survey (OS) devised the national grid reference system, and it is heavily used in its survey data, and in maps based on those surveys, whether published by the Ordnance Survey or by commercial map producers. Grid references are also commonly quoted in other publications and data sources, such as guide books and government planning documents. A number of different systems exist that can provide grid references for locations within the British Isles: this article describes the system created solely for Great Britain and its outlying islands (including the Isle of Man). The Irish grid reference system is a similar system created by the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Yorkshire Dales
The Yorkshire Dales are a series of valleys, or Dale (landform), dales, in the Pennines, an Highland, upland range in England. They are mostly located in the Ceremonial counties of England, ceremonial county of North Yorkshire, but extend into Cumbria and Lancashire; they are entirely within the Historic counties of England, historic boundaries of Yorkshire. The majority of the dales are within the Yorkshire Dales National Park, created in 1954. The exception is the area around Nidderdale, which forms the separate Nidderdale AONB, Nidderdale Area of Outstanding Natural Beauty. The landscape of the Yorkshire Dales consists of sheltered glacial valleys separated by exposed moorland. The predominant rock is Carboniferous Limestone, which is particularly visible in the south-west in features such as Malham Cove. It is overlain in many areas by the Yoredale Series of alternating weak shales and hard limestones and sandstones, which give the dales their characteristic 'stepped' appeara ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Great Whernside
Great Whernside is a fell in the Yorkshire Dales, England, not to be confused with Whernside, some to the west. Its summit is the highest point of the eastern flank of Wharfedale above Kettlewell. Great Whernside forms the watershed between Wharfedale and Nidderdale, and is on the boundary between the Yorkshire Dales National Park and Nidderdale Area of Outstanding Natural Beauty. The River Nidd rises on the eastern slopes of Great Whernside, above Angram Reservoir. Name The name ''Whernside'', first recorded in 1214 as ''Querneside'', is of Old English origin. It is derived from ''cweorn'' 'Quern-stone, quern' or 'millstone' and ''sīde'' 'hillside', so means "hillside where millstones are found". The upper part of the hill is composed of millstone grit, and there were once quarries on the Wharfedale side. According to one source the name was originally applied to the hillside on the Wharfedale side, and then extended to the whole hill as seen from Wharfedale. The hill ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Moorland
Moorland or moor is a type of Habitat (ecology), habitat found in upland (geology), upland areas in temperate grasslands, savannas, and shrublands and the biomes of montane grasslands and shrublands, characterised by low-growing vegetation on Soil pH, acidic soils. Moorland today generally means uncultivated hill land (such as Dartmoor in South West England), but also includes low-lying wetlands (such as Sedgemoor, also South West England). It is closely related to heath, although experts disagree on the exact distinction between these types of vegetation. Generally, moor refers to Highland (geography), highland and high rainfall areas, while heath refers to lowland zones which are more likely to be the result of human activity. Moorland habitats are found mainly in Tropics, tropical Africa, Northern Europe, northern and western Europe, and South America. Most of the world's moorlands are diverse ecosystems. In the extensive moorlands of the tropics, biodiversity can be extremely ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
