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Wenlock Group
The Wenlock Group (Wenlockian), in geology, is the middle series of stratum, strata in the Silurian (Upper Silurian) of Great Britain. This group in the typical area in the Wales, Welsh border counties contains the following formations: Much Wenlock Limestone Formation, 90–300 ft.; Wenlock Shale, up to 1900 ft.; Woolhope or Barr Limestone and shale, 150 ft. Stratigraphy Woolhope Beds The Woolhope Beds consist mainly of shales which are generally calcareous and pass frequently into irregular nodular and lenticular limestone. In the Malvern Hills there is much shale at the base, and in places the limestone may be absent. These beds are best developed in Herefordshire; they appear also at May Hill in Gloucestershire and in Radnorshire. Common fossils are ''Phacops caudatus'', ''Encrinurus tuberculatus'', ''Orthis calligramma'', ''Atrypa reticularis'', and ''Orthoceras annulatum''. Wenlock Shales The Wenlock Shales are pale or dark-grey shales which extend thro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geology
Geology (). is a branch of natural science concerned with the Earth and other astronomical objects, the rocks of which they are composed, and the processes by which they change over time. Modern geology significantly overlaps all other Earth sciences, including hydrology. It is integrated with Earth system science and planetary science. Geology describes the structure of the Earth on and beneath its surface and the processes that have shaped that structure. Geologists study the mineralogical composition of rocks in order to get insight into their history of formation. Geology determines the relative ages of rocks found at a given location; geochemistry (a branch of geology) determines their absolute ages. By combining various petrological, crystallographic, and paleontological tools, geologists are able to chronicle the geological history of the Earth as a whole. One aspect is to demonstrate the age of the Earth. Geology provides evidence for plate tectonics, the ev ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Orthoceras
''Orthoceras'', from Ancient Greek ὀρθός (''orthós''), meaning "straight", and κέρας (''kéras''), meaning "horn", is a genus of extinct nautiloid cephalopod restricted to Middle Ordovician-aged marine limestones of the Baltic States and Sweden. This genus is sometimes called ''Orthoceratites''. Note it is sometimes misspelled as ''Orthocera'', ''Orthocerus'' or ''Orthoceros''. ''Orthoceras'' was formerly thought to have had a worldwide distribution due to the genus' use as a wastebasket taxon for numerous species of conical-shelled nautiloids throughout the Paleozoic and Triassic. Since this work was carried out and re-cataloging of the genus, ''Orthoceras'' '' sensu stricto'' refers to ''Orthoceras regulare'', of Ordovician-aged Baltic Sea limestones of Sweden and neighboring areas. These are slender, elongate shells with the middle of the body chamber transversely constricted, and a subcentral orthochoanitic siphuncle. The surface is ornamented by a network ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ludlow
Ludlow ( ) is a market town and civil parish in Shropshire (district), Shropshire, England. It is located south of Shrewsbury and north of Hereford, on the A49 road (Great Britain), A49 road which bypasses the town. The town is near the confluence of the rivers River Corve, Corve and River Teme, Teme. The oldest part is the medieval Defensive wall, walled town, founded in the late 11th century after the Norman Conquest, Norman conquest of England. It is centred on a small hill which lies on the eastern bank of a bend of the River Teme. Situated on this hill are Ludlow Castle and the parish church, St Laurence's Church, Ludlow, St Laurence's, the largest in the county. From there the streets slope downward to the rivers River Corve, Corve and River Teme, Teme, to the north and south respectively. The town is in a sheltered spot beneath Mortimer Forest and the Clee Hills, which are clearly visible from the town. Ludlow has nearly 500 listed buildings, including examples of med ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aymestrey
Aymestrey ( ) is a village and civil parish in north-western Herefordshire, England. The population of this civil parish, including the hamlet of Yatton, Aymestrey, Yatton, at the United Kingdom Census 2011, 2011 Census was 351. Location It is located on the A4110 road, about 7 miles north-west of Leominster and 8 miles south-west of the historic market town of Ludlow, in south Shropshire. The village is on the River Lugg. Amenities and history Aymestrey is home to several homes and cottages, the church dedicated to St John the Baptist and Alchmund of Derby, St Alkmund, a village hall and a pub or Public house#Inns, Inn: The Riverside Inn, situated next to River Lugg just off the main road. The Mortimer Trail ''geograph.org.uk'' waymarked recreational walk passes through the village ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dudley
Dudley ( , ) is a market town in the West Midlands, England, southeast of Wolverhampton and northwest of Birmingham. Historically part of Worcestershire, the town is the administrative centre of the Metropolitan Borough of Dudley. In the 2011 census, it had a population of 79,379. The wider Metropolitan Borough had a population of 312,900. In 2014, the borough council adopted a slogan describing Dudley as the capital of the Black Country, a title by which it had long been informally known. Originally a market town, Dudley was one of the birthplaces of the Industrial Revolution and grew into an industrial centre in the 19th century with its iron, coal, and limestone industries before their decline and the relocation of its commercial centre to the nearby Merry Hill Shopping Centre in the 1980s. Tourist attractions include Dudley Zoo and Castle, the 12th century priory ruins, and the Black Country Living Museum. History Early history Dudley has a history dating b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anticline
In structural geology, an anticline is a type of Fold (geology), fold that is an arch-like shape and has its oldest Bed (geology), beds at its core, whereas a syncline is the inverse of an anticline. A typical anticline is convex curve, convex up in which the hinge or crest is the location where the curvature is greatest, and the limbs are the sides of the fold that Strike and dip, dip away from the hinge. Anticlines can be recognized and differentiated from antiforms by a sequence of rock layers that become progressively older toward the center of the fold. Therefore, if age relationships between various Stratum, rock strata are unknown, the term antiform should be used. The progressing age of the rock strata towards the core and uplifted center, are the trademark indications for evidence of anticlines on a geological map. These formations occur because anticlinal ridges typically develop above thrust faults during crustal deformations. The uplifted core of the fold cau ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wenlock Edge
Wenlock Edge is a limestone escarpment near Much Wenlock, Shropshire, England and a site of special scientific interest because of its geology. It is over long, running southwest to northeast between Craven Arms and Much Wenlock, and is roughly 1,083 feet above sea level. The deciduous woodland which runs along it covers much of the steep slopes of the escarpment and in parts it is very well preserved. It was featured on the 2005 TV programme ''Seven Natural Wonders'' as one of the wonders of the Midlands. Wenlock Edge contains many interesting features such as Flounders' Folly, Wilderhope Manor and Shipton Hall and waymarked walks such as the Shropshire Way and bridleways such as the Jack Mytton Way. It is a popular area for hillwalking, cycling, mountain biking and horseback rider, horseriding and is also frequented by tourists and sightseers. Robert Hart (horticulturist), Robert Hart created a model forest gardening, forest garden from a small orchard on his farm called H ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Concretion
A concretion is a hard and compact mass formed by the precipitation of mineral cement within the spaces between particles, and is found in sedimentary rock or soil. Concretions are often ovoid or spherical in shape, although irregular shapes also occur. The word ''concretion'' is borrowed from Latin , itself derived from ''concrescere'' , from ''con-'' and ''crescere'' . Concretions form within layers of sedimentary strata that have already been deposited. They usually form early in the burial history of the sediment, before the rest of the sediment is hardened into rock. This concretionary cement often makes the concretion harder and more resistant to weathering than the host stratum. There is an important distinction to draw between concretions and nodules. Concretions are formed from mineral precipitation around some kind of nucleus while a nodule is a replacement body. Descriptions dating from the 18th century attest to the fact that concretions have long been regarde ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gertrude Elles
Gertrude Lilian Elles MBE (8 October 1872 – 18 November 1960) was a British geologist, known for her work on graptolites. Personal life Gertrude Elles was born on 8 October 1872. She was the youngest of six children and growing up was given the nickname "G" by her family. She was spoken of quite highly by the people around her and was described as having a wide range of love for music and always growing her knowledge of the world. Every year, the Elles family would travel to the Morenish Estate near Killen to hunt grouse. During these family vacations, the young Gertrude fell in love with Scotland, especially the Highlands. Elles' love for geology evolved through exploration of the outdoors, museum visits, and fieldtrips. Her interests allowed her to bond with family members such as her nephew whom she showed evidence of mechanical weathering by plants too along Moine Thrust. Elles' first introduction into geology as a formal practice was within her courses she took at W ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Graptolite
Graptolites are a group of colonial animals, members of the subclass Graptolithina within the class Pterobranchia. These filter-feeding organisms are known chiefly from fossils found from the Middle Cambrian ( Miaolingian, Wuliuan) through the Lower Carboniferous ( Mississippian). A possible early graptolite, ''Chaunograptus'', is known from the Middle Cambrian. Recent analyses have favored the idea that the living pterobranch '' Rhabdopleura'' represents an extant graptolite which diverged from the rest of the group in the Cambrian. Fossil graptolites and ''Rhabdopleura'' share a colony structure of interconnected zooids housed in organic tubes (theca) which have a basic structure of stacked half-rings (fuselli). Most extinct graptolites belong to two major orders: the bush-like sessile Dendroidea and the planktonic, free-floating Graptoloidea. These orders most likely evolved from encrusting pterobranchs similar to ''Rhabdopleura''. Due to their widespread abundance, pl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Coral
Corals are colonial marine invertebrates within the subphylum Anthozoa of the phylum Cnidaria. They typically form compact Colony (biology), colonies of many identical individual polyp (zoology), polyps. Coral species include the important Coral reef, reef builders that inhabit tropical oceans and secrete calcium carbonate to form a hard skeleton. A coral "group" is a colony of very many cloning, genetically identical polyps. Each polyp is a sac-like animal typically only a few millimeters in diameter and a few centimeters in height. A set of tentacles surround a central mouth opening. Each polyp excretes an exoskeleton near the base. Over many generations, the colony thus creates a skeleton characteristic of the species which can measure up to several meters in size. Individual colonies grow by asexual reproduction of polyps. Corals also breed sexually by spawning: polyps of the same species release gametes simultaneously overnight, often around a full moon. Fertilized eggs form ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Monmouthshire
Monmouthshire ( ; ) is a Principal areas of Wales, county in the South East Wales, south east of Wales. It borders Powys to the north; the English counties of Herefordshire and Gloucestershire to the north and east; the Severn Estuary to the south, and Torfaen, Newport, Wales, Newport and Blaenau Gwent to the west. The largest town is Abergavenny, and the administrative centre is Usk. The county is administered by Monmouthshire County Council. It sends two directly-elected members to the Senedd at Cardiff and one elected member to the Parliament of the United Kingdom, UK parliament at Westminster. The county name is identical to that of the Monmouthshire (historic), historic county, of which the current local authority covers the eastern three-fifths. Between 1974 and 1996, the county was known as Gwent (county), Gwent, recalling Kingdom of Gwent, the medieval kingdom which covered a similar area. The present county was formed under the Local Government (Wales) Act 1994, which ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
