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Moray Group
The Moray Group is a stratigraphic group, a set of geological rock strata of Paleocene to Eocene age, found beneath the North Sea and in the Faroe-Shetland Basin. Two sequences are recognised, a shelf succession consisting of sandstones and siltstones of the Dornoch Formation and a thicker basinal succession consisting of mainly mudstones of the Sele Formation and the Balder Formation The Balder Formation is a geological formation of lowermost Eocene in age, found in the Central and Northern North Sea and Faroe-Shetland Basin. The formation is named after Balder, a god from Norse mythology. Layers of tuff are found, particularly .... References {{Reflist Geological groups of the United Kingdom Paleogene System of Europe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Group (stratigraphy)
In geology, a group is a lithostratigraphic unit consisting of a series of related formations that have been classified together to form a group. Formations are the fundamental unit of stratigraphy. Groups may sometimes be combined into supergroups. Groups are useful for showing relationships between formations, and they are also useful for small-scale mapping or for studying the stratigraphy of large regions. Geologists exploring a new area have sometimes defined groups when they believe the strata within the groups can be divided into formations during subsequent investigations of the area. It is possible for only some of the strata making up a group to be divided into formations. An example of a group is the Glen Canyon Group, which includes (in ascending order) the Wingate Sandstone, the Moenave Formation, the Kayenta Formation, and the Navajo Sandstone. Each of the formations can be distinguished from its neighbor by its lithology, but all were deposited in the same vast ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stronsay Group
Stronsay () is an island in Orkney, Scotland. It is known as Orkney's 'Island of Bays', owing to an irregular shape with miles of coastline, with three large bays separated by two isthmuses: St Catherine's Bay to the west, the Bay of Holland to the south and Mill Bay to the east. Stronsay is in area, and in altitude at its highest point. It has a usually resident population of 349. The main village is Whitehall, home to a heritage centre. Sights on the island include the Vat of Kirbister, a natural arch described as the "finest in Orkney", white sand beaches in the three bays, and various seabirds amongst which are Arctic terns. Geography and geology As with most of Orkney, Stronsay is made up of Old Red Sandstone which has produced a fine soil in many places. It is generally low-lying. On the eastern coast, spectacular rock formations include the Vat of Kirbister – Stronsay's famous natural rock arch, often described as the finest in Orkney. The coast around Odiness Bay ... [...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 (parallel layering).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 disting ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Siltstone
Siltstone, also known as aleurolite, is a clastic sedimentary rock that is composed mostly of silt. It is a form of mudrock with a low clay mineral content, which can be distinguished from shale by its lack of fissility.Blatt ''et al.'' 1980, pp.381-382 Although its permeability and porosity is relatively low, siltstone is sometimes a tight gas reservoir rock, an unconventional reservoir for natural gas that requires hydraulic fracturing for economic gas production. Siltstone was prized in ancient Egypt for manufacturing statuary and cosmetic palettes. The siltstone quarried at Wadi Hammamat was a hard, fine-grained siltstone that resisted flaking and was almost ideal for such uses. Description There is not complete agreement on the definition of siltstone. One definition is that siltstone is mudrock ( clastic sedimentary rock containing at least 50% clay and silt) in which at least 2/3 of the clay and silt fraction is composed of silt-sized particles. Silt is defined a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sandstone
Sandstone is a clastic sedimentary rock composed mainly of sand-sized (0.0625 to 2 mm) silicate grains. Sandstones comprise about 20–25% of all sedimentary rocks. Most sandstone is composed of quartz or feldspar (both silicates) because they are the most resistant minerals to weathering processes at the Earth's surface. Like uncemented sand, sandstone may be any color due to impurities within the minerals, but the most common colors are tan, brown, yellow, red, grey, pink, white, and black. Since sandstone beds often form highly visible cliffs and other topographic features, certain colors of sandstone have been strongly identified with certain regions. Rock formations that are primarily composed of sandstone usually allow the percolation of water and other fluids and are porous enough to store large quantities, making them valuable aquifers and petroleum reservoirs. Quartz-bearing sandstone can be changed into quartzite through metamorphism, usually related to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rock Strata
In geology and related fields, a stratum ( : strata) is a layer of rock or sediment characterized by certain lithologic properties or attributes that distinguish it from adjacent layers from which it is separated by visible surfaces known as either '' bedding surfaces'' or ''bedding planes''.Salvador, A. ed., 1994. ''International stratigraphic guide: a guide to stratigraphic classification, terminology, and procedure. 2nd ed.'' Boulder, Colorado, The Geological Society of America, Inc., 215 pp. . Prior to the publication of the International Stratigraphic Guide, older publications have defined a stratum as either being either equivalent to a single bed or composed of a number of beds; as a layer greater than 1 cm in thickness and constituting a part of a bed; or a general term that includes both ''bed'' and ''lamina''.Neuendorf, K.K.E., Mehl, Jr., J.P., and Jackson, J.A. , eds., 2005. ''Glossary of Geology'' 5th ed. Alexandria, Virginia, American Geological Institute. 779 pp. . ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Group (stratigraphy)
In geology, a group is a lithostratigraphic unit consisting of a series of related formations that have been classified together to form a group. Formations are the fundamental unit of stratigraphy. Groups may sometimes be combined into supergroups. Groups are useful for showing relationships between formations, and they are also useful for small-scale mapping or for studying the stratigraphy of large regions. Geologists exploring a new area have sometimes defined groups when they believe the strata within the groups can be divided into formations during subsequent investigations of the area. It is possible for only some of the strata making up a group to be divided into formations. An example of a group is the Glen Canyon Group, which includes (in ascending order) the Wingate Sandstone, the Moenave Formation, the Kayenta Formation, and the Navajo Sandstone. Each of the formations can be distinguished from its neighbor by its lithology, but all were deposited in the same vast ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Montrose Group
The Montrose Group is a stratigraphic group, a set of geological rock strata of Paleocene age, found beneath the North Sea The North Sea lies between Great Britain, Norway, Denmark, Germany, the Netherlands and Belgium. An epeiric sea on the European continental shelf, it connects to the Atlantic Ocean through the English Channel in the south and the Norwegian S ... and locally onshore in southeastern England. It was originally described from offshore exploration wells in the North Sea. The Thanet Formation in the London Basin has more recently been assigned to the group. References {{Reflist Geological groups of the United Kingdom Paleocene Series of Europe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Balder Formation
The Balder Formation is a geological formation of lowermost Eocene in age, found in the Central and Northern North Sea and Faroe-Shetland Basin. The formation is named after Balder, a god from Norse mythology. Layers of tuff are found, particularly at the base of the unit, deposited by airfall from volcanoes associated with the North Atlantic Igneous Province The North Atlantic Igneous Province (NAIP) is a large igneous province in the North Atlantic, centered on Iceland. In the Paleogene, the province formed the Thulean Plateau, a large basaltic lava plain, which extended over at least in area and in .... References Geologic formations of the United Kingdom Eocene Series of Europe Ypresian Stage Mudstone formations Sandstone formations Tuff formations Eocene volcanism Reservoir rock formations ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paleocene
The Paleocene, ( ) or Palaeocene, is a geological epoch (geology), epoch that lasted from about 66 to 56 mya (unit), million years ago (mya). It is the first epoch of the Paleogene Period (geology), Period in the modern Cenozoic Era (geology), Era. The name is a combination of the Ancient Greek ''palaiós'' meaning "old" and the Eocene Epoch (which succeeds the Paleocene), translating to "the old part of the Eocene". The epoch is bracketed by two major events in Earth's history. The K–Pg extinction event, brought on by Chicxulub impact, an asteroid impact and possibly volcanism, marked the beginning of the Paleocene and killed off 75% of living species, most famously the non-avian dinosaurs. The end of the epoch was marked by the Paleocene–Eocene Thermal Maximum (PETM), which was a major climatic event wherein about 2,500–4,500 gigatons of carbon were released into the atmosphere and ocean systems, causing a spike in global temperatures and ocean acidification. In the Pal ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sele Formation , an aris ...
Sele may refer to: Places Africa * Sele, Burkina Faso, a village in the Ouéleni Department of Burkina Fase. * Sele, Ethiopia, a town in Agbe municipality Asia * Sele, Turkey, a Turkish village in Kailar in Ottoman times *Şələ, Azerbaijan *Seleucia (Susiana), an ancient city now in Iran formerly called ''Sele'' Europe *Sele Mill, a former watermill in Hertfordshire, England *Sele, West Sussex, an English hamlet *Sele Priory, a Benedictine monastery in modern-day Upper Beeding, West Sussex *Zell, Carinthia, the Slovene name * Sele, Norway, two villages with this name in Øygarden, Norway ;River: Sele (river), in southwestern Italy People with the surname *Aaron Sele, American baseball player *Baron Saye and Sele Baron Saye and Sele is a title in the Peerage of England held by the Twisleton-Wykeham-Fiennes family. The title dates to 1447 but it was recreated in 1603. Confusion over the details of the 15th-century title has led to conflicting order for ti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dornoch Formation
Dornoch (; gd, Dòrnach ; sco, Dornach) is a town, seaside resort, parish and former royal burgh in the county of Sutherland in the Highlands of Scotland. It lies on the north shore of the Dornoch Firth, near to where it opens into the Moray Firth to the east. The town is within the Highland local government council area. The town is near the A9 road, to which it is linked by the A949 and the B9168. The town also has a grass air strip suitable for small aircraft and helicopters. History The name 'Dornoch' is derived from the Gaelic for 'pebbly place', suggesting that the area contained pebbles the size of a fist (''dorn'') which could therefore be used as weapons. Archaeological excavations during the development of a new business park in 1997 revealed a building, evidence for ironworking and part of a whale, dating from 8th through the 11th centuries AD. The archaeologists surmised that the findings are of an industrial area on the edge of a settlement and that ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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