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Alyn Valley Fault
This is a list of the named geological faults affecting the rocks of Wales. See the fault (geology), main article on faults for a fuller treatment of fault types and nomenclature but in brief, the main types are normal faults, reverse faults, thrusts or thrust faults and strike-slip faults. Many faults may have acted as both normal faults at one time and as reverse or thrust faults at another and may or may not have also incorporated some degree of strike-slip movement too. Fault zones, fault belts and fault complexes typically describe assemblages of faults which have a common origin and history and whose alignments tend to be sub-parallel to one another. There are also a number of Disturbance (geology), 'disturbances', notably in South Wales. These linear features are a combination of faults and fold (geology), folds - the relative importance of faulting and folding varying along the length of each disturbance. Key to tables *Column 1 indicates the name of the fault. Note that ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wales
Wales ( ) is a Countries of the United Kingdom, country that is part of the United Kingdom. It is bordered by the Irish Sea to the north and west, England to the England–Wales border, east, the Bristol Channel to the south, and the Celtic Sea to the south-west. , it had a population of 3.2 million. It has a total area of and over of Coastline of Wales, coastline. It is largely mountainous with its higher peaks in the north and central areas, including Snowdon (), its highest summit. The country lies within the Temperate climate, north temperate zone and has a changeable, Oceanic climate, maritime climate. Its capital and largest city is Cardiff. A distinct Culture of Wales, Welsh culture emerged among the Celtic Britons after the End of Roman rule in Britain, Roman withdrawal from Britain in the 5th century, and Wales was briefly united under Gruffudd ap Llywelyn in 1055. After over 200 years of war, the Conquest of Wales by Edward I, conquest of Wales by King Edward I o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ceibwr Bay Fault
The Ceibwr Bay Fault is a WSW-ENE trending fault zone that cuts Ordovician rocks of the Ashgill Nantmel Mudstones Formation and the Caradoc Dinas Island Formation. The fault is exposed on the south side of Cardigan Bay in Wales and forms part of the Fishguard-Cardigan Fault Zone. It extends from the coast at Ceibwr Bay at its western end to the coast at Aberporth Aberporth is a seaside village, community (Wales), community and electoral ward in Ceredigion, Wales. The population at the 2001 Census, was 2,485, of whom 49 per cent could speak the Welsh language. At the 2011 Census, the population of the co ... at its eastern end. The fault zone is thought to have been active as a normal fault throughout the deposition of the Ordovician sequence. See also * List of geological faults of Wales References Geology of Wales Cardigan Bay {{Wales-geo-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vale Of Clwyd
The Vale of Clwyd () is a tract of low-lying ground in the county of Denbighshire in north-east Wales. The Vale extends south-southwestwards from the coast of the Irish Sea for some 20 miles (about 30 km) forming a triangle of low ground bounded on its eastern side by the well-defined scarp of the Clwydian Range and to the west by numerous low hills. The River Clwyd (Welsh: ) which rises within Clocaenog Forest, southwest of Denbigh, runs the full length of the vale. It is joined by the two major left bank tributaries of the River Clywedog (Welsh: ) and River Elwy (Welsh: ) and the smaller right bank tributary of the River Wheeler (Welsh: ). History Dyffryn Clwyd was a cantref of Medieval Wales, and from 1282 was a marcher lordship. Settlement and administration At its seaward end are the coastal resorts of Kinmel Bay (Welsh: ), Rhyl and Prestatyn whilst the town of Abergele and city of St Asaph (Welsh: ) lie just inland. The other principal towns of the vale are ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shell Island (Wales)
Mochras (also known in English as Shell Island) is a peninsula lying west of Llanbedr in Gwynedd, Wales. The peninsula was formed after the River Artro was diverted by the Earl of Winchilsea in 1819 from its previous course where it entered the sea to the south of Mochras. Prior to this, access to the ancient settlement on the 'island' would have been through the village of Llandanwg, which is now across the estuary. Mochras is known for the wide variety of seashells that wash up on the beach, and for its wild flowers. It is said to have been connected to the mythical Cantre'r Gwaelod. The peninsula lies within the Snowdonia National Park. From the end of October to the following March local farmers bring their sheep from the lowlands to graze on the 'island'. Geology Mochras is significant for the UK earth sciences. The area consists of a low lying raised beach (which encompasses the nearby Llanbedr Airport). Between 1967 and 1969 the Institute of Geological Sciences (n ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Menai Strait
The Menai Strait () is a strait which separates the island of Anglesey from Gwynedd, on the mainland of Wales. It is situated between Caernarfon Bay in the south-west and Conwy Bay in the north-east, which are both inlets of the Irish Sea. The strait is about long and varies in width from between Fort Belan and Abermenai Point to between Puffin Island (Anglesey), Puffin Island () and Penmaenmawr. It contains several islands, including Church Island (Anglesey), Church Island (), on which is located St Tysilio's Church, Menai Bridge, St Tysilio's Church. The strait is bridged by the Menai Suspension Bridge (), which was completed in 1826 to a design by Thomas Telford and carries the A5 road (Great Britain), A5 road, and the Britannia Bridge () a truss arch bridge which carries the North Wales Main Line and the A55 road; it is an adaptation of a Tubular bridge, tubular railway bridge completed in 1850 to a design by Robert Stephenson, which was severely damaged by a fire in 1970. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Neath Disturbance
The Neath Disturbance is a geological structure which stretches across south Wales from Swansea Bay northeastwards as far as Hereford in western England. It consists of a series of both faults and associated folds which were active during the mountain-building period known as the Variscan orogeny. This line of weakness probably featured in the earlier Caledonian Orogeny and perhaps reflects a more ancient line of weakness in the basement rocks. The Disturbance gives rise to a lineament crossing the region, that is to say that it is responsible for a number of significant landscape features along its 100 km length. Prominent amongst these is the Vale of Neath, a deep valley incised by a glacier during the ice ages along this line of weakness in the Earth's crust and now occupied by the River Neath between Pontneddfechan and Swansea Bay. The hill of Moel Penderyn also lies on the Disturbance a little further east. A part of the Vale of Grwyne north of The Sugarloaf and t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cwm Pennant Fault
The Cwm Pennant Fault is a SSW-NNE trending normal fault system in North Wales. While initially understood as a simple normal fault system throwing down to the east, research has revealed it is part of a wider, more complex structure known as the Cwm Pennant Fracture Zone. This zone represents one of several linear belts of unusual deformation across North Wales, interpreted as reflecting the movement of older Lower Palaeozoic-era rocks above pre-existing basement fractures. The fracture zone has influenced regional geology since at least the Early Cambrian, affecting sedimentation patterns, controlling volcanic activity, and playing a crucial role during the end- Caledonian mountain-building event through a process of transpression – a combination of compression and sideways movement. The structural characteristics of the Cwm Pennant Fracture Zone, including intense folding and distinctive cleavage patterns, have helped geologists develop a new understanding of how deep baseme ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cwm Llwyd Fault
The Cwm Llwyd Fault is a fault in the west of the Black Mountain of South Wales. It runs north, parallel to the A4069 road, for over 4 km from near Brynaman to meet the Carreg Cennen Disturbance near Brest Cwm Llwyd. It moved as a sinistral (left lateral) strike-slip fault during the Variscan Orogeny. Together with the Llwyn Celyn Fault it formed a left-stepping offset that created a pull apart structure, which preserved the Cwm Llwyd Outlier of Namurian rocks. Description The Cwm Llwyd Fault is a steep, north-to-south-trending fracture that slices through the Black Mountain escarpment near Nant Oesglyn in Carmarthenshire, Wales. It separates older Devonian and Dinantian limestones on its east from progressively younger Namurian sandstones and shales on its west, giving a total vertical mismatch (known to geologists as throw) of roughly 200–225 m where the fault crosses the escarpment. Field mapping shows that displacement increases north-wards, so that below the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cribarth Disturbance
The Cribarth Disturbance is a geological structure forming a lineament which stretches across south Wales from Swansea up the Swansea Valley then northeastwards to Brecon and beyond. It consists of both a series of faults and associated folds which were active during the mountain-building period known as the Variscan orogeny. This line of weakness probably featured in the earlier Caledonian Orogeny and perhaps reflects a more ancient line of weakness in the basement rocks. It is also known (in part) as the Tawe Valley Disturbance or the Swansea Valley Disturbance. Influence on the landscape The Disturbance is responsible for a number of significant landscape features along its 50 km length. Prominent amongst these is the Swansea Valley, formed both by glacial action during the ice ages and river erosion along this line of weakness in the Earth's crust between Abercraf and Swansea. It is now occupied by the River Tawe. The geologically complex mountain of Cribarth also lie ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Moel Oernant
Moel Oernant is a high hill in the community of Trawsfynydd in the county of Gwynedd in North Wales. It has a number of western tops, the highest of which reaches a height of overlooking the waterbody known as Llyn Gelli-Gain and another at Frîdd Wen exceeds . To the south of the lake is the top of Pîg Idris which reaches 429m. The minor top of Y-Foel attains 430m to the northeast of Moel Oernant. Geology The hill is formed largely from the mudstones, siltstone and sandstones of the Maentwrog Formation and the siltstones of the underlying Clogau Formation, component units of the Mawddach Group of Cambrian age sedimentary rocks. Sandstones and siltstones of the Gamlan Formation of the Harlech Group are also present. An igneous intrusion of microtonalite lies to the west of the summit and the whole hill is cross-cut by dykes of similar material and later dolerite. Some quartz vein mineralization is recorded within the microtonalite outcrop. A number of faults criss-cros ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
River Conwy
The River Conwy (; ) is a river in north Wales. From its source to its discharge in Conwy Bay it is long and drains an area of 678 square km. "Conwy" was formerly anglicised as "Conway." The name 'Conwy' derives from the old Welsh words ''cyn'' (chief) and ''gwy'' (water), the river being originally called the 'Cynwy'. It rises on the Migneint moor where a number of small streams flow into Llyn Conwy, then flows in a generally northern direction, being joined by the tributaries of the rivers Machno and Afon Lledr before reaching Betws-y-coed, where it is also joined by Llugwy. From Betws-y-coed the river continues to flow north through Llanrwst, Trefriw (where it is joined by the Afon Crafnant) and Dolgarrog (where it is joined by Afon Porth-llwyd and Afon Ddu) before reaching Conwy Bay at Conwy. A local quay, Cei Cae Gwyn, is located on its bank. During spring tides the river is tidal as far as Tan-lan, near Llanrwst. Tributaries of the River Conwy This is a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
