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Usk Inlier
The Usk Inlier is a domed outcrop of rock strata of Silurian age in Monmouthshire in south-eastern Wales. It is located in the countryside between the towns of Caerleon and Pontypool and the village of Raglan. The longer axis of the dome or ' pericline', often referred to as the Usk Anticline, is aligned north–south. The inlier is largely surrounded by a sequence of Old Red Sandstone rocks of Devonian The Devonian ( ) is a geologic period and system of the Paleozoic era, spanning 60.3 million years from the end of the Silurian, million years ago (Mya), to the beginning of the Carboniferous, Mya. It is named after Devon, England, whe ... age, though both these and the Silurian rocks are largely obscured by superficial deposits.British Geological Survey 1:50,000 scale geological map sheets 232, 233, 249 & 250 (England & Wales series) References Anticlines Landforms of Monmouthshire Geology of Wales Rock formations of Wales {{Wales-geo-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dome (geology)
A dome is a feature in structural geology consisting of symmetrical anticlines that intersect each other at their respective apices. Intact, domes are distinct, rounded, spherical-to- ellipsoidal-shaped protrusions on the Earth's surface. However, a transect parallel to Earth's surface of a dome features concentric rings of strata. Consequently, if the top of a dome has been eroded flat, the resulting structure in plan view appears as a bullseye, with the youngest rock layers at the outside, and each ring growing progressively older moving inwards. These strata would have been horizontal at the time of deposition, then later deformed by the uplift associated with dome formation. Formation mechanisms There are many possible mechanisms responsible for the formation of domes, the foremost of which are post-impact uplift, refolding, and diapirism. Post-impact uplift A complex crater, caused by collision of a hypervelocity body with another larger than itself, is typified by th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Silurian
The Silurian ( ) is a geologic period and system spanning 24.6 million years from the end of the Ordovician Period, at million years ago ( Mya), to the beginning of the Devonian Period, Mya. The Silurian is the shortest period of the Paleozoic Era. As with other geologic periods, the rock beds that define the period's start and end are well identified, but the exact dates are uncertain by a few million years. The base of the Silurian is set at a series of major Ordovician–Silurian extinction events when up to 60% of marine genera were wiped out. One important event in this period was the initial establishment of terrestrial life in what is known as the Silurian-Devonian Terrestrial Revolution: vascular plants emerged from more primitive land plants, dikaryan fungi started expanding and diversifying along with glomeromycotan fungi, and three groups of arthropods (myriapods, arachnids and hexapods) became fully terrestrialized. A significant evolutionary milestone during ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Monmouthshire
Monmouthshire ( cy, Sir Fynwy) is a county in the south-east of Wales. The name derives from the historic county of the same name; the modern county covers the eastern three-fifths of the historic county. The largest town is Abergavenny, with other towns and large villages being: Caldicot, Chepstow, Monmouth, Magor and Usk. It borders Torfaen, Newport and Blaenau Gwent to the west; Herefordshire and Gloucestershire to the east; and Powys to the north. Historic county The historic county of Monmouthshire was formed from the Welsh Marches by the Laws in Wales Act 1535 bordering Gloucestershire to the east, Herefordshire to the northeast, Brecknockshire to the north, and Glamorgan to the west. The Laws in Wales Act 1542 enumerated the counties of Wales and omitted Monmouthshire, implying that the county was no longer to be treated as part of Wales. However, for all purposes Wales had become part of the Kingdom of England, and the difference had little practical effect. F ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wales
Wales ( cy, Cymru ) is a Countries of the United Kingdom, country that is part of the United Kingdom. It is bordered by England to the Wales–England border, east, the Irish Sea to the north and west, the Celtic Sea to the south west and the Bristol Channel to the south. It had a population in 2021 of 3,107,500 and has a total area of . Wales has over of coastline and is largely mountainous with its higher peaks in the north and central areas, including Snowdon (), its highest summit. The country lies within the Temperateness, north temperate zone and has a changeable, maritime climate. The capital and largest city is Cardiff. Welsh national identity emerged among the Celtic Britons after the Roman withdrawal from Britain in the 5th century, and Wales was formed as a Kingdom of Wales, kingdom under Gruffydd ap Llywelyn in 1055. Wales is regarded as one of the Celtic nations. The Conquest of Wales by Edward I, conquest of Wales by Edward I of England was completed by 1283, th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Caerleon
Caerleon (; cy, Caerllion) is a town and community in Newport, Wales. Situated on the River Usk, it lies northeast of Newport city centre, and southeast of Cwmbran. Caerleon is of archaeological importance, being the site of a notable Roman legionary fortress, Isca Augusta, and an Iron Age hillfort. Close to the remains of Isca Augusta are the National Roman Legion Museum and the Roman Baths Museum. The town also has strong historical and literary associations: Geoffrey of Monmouth elevated the significance of Caerleon as a major centre of British history in his ''Historia Regum Britanniae'' (c. 1136), and Alfred Lord Tennyson wrote '' Idylls of the King'' (1859–1885) while staying in Caerleon. History Pre-Roman history The area around Caerleon is of considerable archaeological interest with a number of important Neolithic sites. By the Iron age, the area was home to the powerful Silures tribe and appears to have been the centre of a wealthy trading network, both manufact ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pontypool
Pontypool ( cy, Pont-y-pŵl ) is a town and the administrative centre of the county borough of Torfaen, within the historic boundaries of Monmouthshire in South Wales. It has a population of 28,970. Location It is situated on the Afon Lwyd river in the county borough of Torfaen. Located at the eastern edge of the South Wales coalfields, Pontypool grew around industries including iron and steel production, coal mining and the growth of the railways. A rather artistic manufacturing industry which also flourished here alongside heavy industry was Japanning, a type of lacquer ware. Pontypool itself consists of several smaller districts, these include Abersychan, Cwmffrwdoer, Pontnewynydd, Trevethin, Penygarn, Wainfelin, Tranch, Brynwern, Pontymoile, Blaendare, Cwmynyscoy, New Inn, Griffithstown and Sebastopol. History The name of the town in Welsh – ''Pont-y-pŵl'' – originates from a bridge ('pont') associated with a pool in the Afon Lwyd. The Welsh word ''pŵl'' is a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Raglan, Monmouthshire
Raglan (; ( cy, Rhaglan) is a village and community in Monmouthshire, south east Wales, United Kingdom. It is located some 9 miles south-west of Monmouth, midway between Monmouth and Abergavenny on the A40 road very near to the junction with the A449 road. The fame of the village derives from Raglan Castle, built for William ap Thomas and now maintained by Cadw. The community includes the villages of Llandenny and Pen-y-clawdd. Raglan itself has a population of 1,183. History and buildings The village stands at the crossing point of two Roman roads, that from Gloucester to Usk, and that from Chepstow to Abergavenny. Raglan was first mentioned in the will of Walter de Clare. The earliest market in Raglan was recorded in 1354. The market cross in the town, which stands in the centre of the cross roads between the church and the Beaufort Arms Inn, consists now only of a massive base on which has been mounted a lamp post. In the large space around this stone the markets were held, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pericline
:''Pericline also refers to a doubly plunging anticline or syncline.'' Pericline is a form of albite exhibiting elongate prismatic crystals. Pericline twinning is a type of crystal twinning which show fine parallel twin laminae typically found in the alkali feldspars microcline Microcline (KAlSi3O8) is an important igneous rock-forming tectosilicate mineral. It is a potassium-rich alkali feldspar. Microcline typically contains minor amounts of sodium. It is common in granite and pegmatites. Microcline forms during slo .... The twinning results from a structural transformation between high temperature and low temperature forms.Tsatskis, I. and E.K.H. Salje (1996) ''Time evolution of pericline twin domains in alkali feldspars'', American Mineralogist, Volume 81, pages 800-81PDF/ref> References Crystallography Tectosilicates {{silicate-mineral-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Inlier
An inlier is an area of older rock (geology), rocks surrounded by younger rocks. Inliers are typically formed by the erosion of overlying younger rocks to reveal a limited outcrop, exposure of the older underlying rocks. Fault (geology), Faulting or fold (geology), folding may also contribute to the observed outcrop pattern. A classic example from Great Britain is that of the inlier of folded Ordovician and Silurian rocks at Horton in Ribblesdale in North Yorkshire which are surrounded by the younger flat-lying Carboniferous Limestone. The location has long been visited by geology students and experts. Another example from South Wales is the Usk Inlier in Monmouthshire where Silurian age rocks are upfolded amidst Old Red Sandstone rocks of Devonian age. A similar outcrop pattern which results from movement on a thrust fault followed by erosion may be termed a window (geology), window. Conversely an outlier is an area of younger rock surrounded by older rocks. An outlier is typical ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Old Red Sandstone
The Old Red Sandstone 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 northeastern seaboard of North America. It also extends northwards into Greenland and Svalbard. These areas were a part of the ancient continent of Euramerica, Euramerica/Laurussia. In Britain it is a lithostratigraphy, lithostratigraphic unit (a sequence of rock strata) to which Stratigraphy, stratigraphers accord Geological unit#Lithostratigraphic units, supergroup status and which is of considerable importance to early paleontology. For convenience the short version of the term, ORS is often used in literature on the subject. The term was coined to distinguish the sequence from the younger New Red Sandstone which also occurs widely throughout Britain. Sedimentology The Old Red Sandstone describes a suite of sedimentary rocks deposited in a variety of environments during the Devonian ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Devonian
The Devonian ( ) is a geologic period and system of the Paleozoic era, spanning 60.3 million years from the end of the Silurian, million years ago (Mya), to the beginning of the Carboniferous, Mya. It is named after Devon, England, where rocks from this period were first studied. The first significant adaptive radiation of life on dry land occurred during the Devonian. Free-sporing vascular plants began to spread across dry land, forming extensive forests which covered the continents. By the middle of the Devonian, several groups of plants had evolved leaves and true roots, and by the end of the period the first seed-bearing plants appeared. The arthropod groups of myriapods, arachnids and hexapods also became well-established early in this period, after starting their expansion to land at least from the Ordovician period. Fish reached substantial diversity during this time, leading the Devonian to often be dubbed the Age of Fishes. The placoderms began dominating ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
David J
David John Haskins (born 24 April 1957, Northampton, Northamptonshire, England), better known as David J, is a British alternative rock musician, producer, and writer. He is the bassist for the gothic rock band Bauhaus and for Love and Rockets. He has composed the scores for a number of plays and films, and also wrote and directed his own plays, ''Silver for Gold (The Odyssey of Edie Sedgwick)'', in 2008, which was restaged at REDCAT in Los Angeles in 2011, and ''The Chanteuse and The Devil's Muse'' in 2011. His artwork has been shown in galleries internationally, and he has been a resident DJ at venues such as the Knitting Factory. David J has released a number of singles and solo albums, and in 1990 he released one of the first No. 1 hits on the then nascent Modern Rock Tracks charts, with "I'll Be Your Chauffeur". His most recent single, "The Day That David Bowie Died" entered the UK vinyl singles chart at number 4 in 2016. The track appears on his double album, ''Vaga ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
