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Marros Group
The Marros Group is the name given to a suite of rocks of Namurian age laid down during the Carboniferous Period in South Wales. These rocks were formerly known as the Millstone Grit Series but are now distinguished from the similar but geographically separate rock sequences of the Pennines and Peak District of northern England and northeast Wales by this new name. Stratigraphy The Group comprises a thick unit of coarse sandstone known as the Twrch Sandstone (formerly the ‘Basal Grit’) which is overlain by the Bishopston Mudstone and the Telpyn Point Sandstone. The mudstones of these latter two formations was formerly known as the ‘Middle Shales’, a name reflecting the position of this sequence sandwiched between the Basal Grit below and the Farewell Rock, the lowermost sandstone of the South Wales Coal Measures, above. The mudstone itself contains a few bands of sandstone such as the ‘Twelve Foot Sandstone’ and locally the ‘Cumbriense Sandstone’. Likewise the Twrc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
St Bride's Bay
St Brides Bay ( cy, Bae Sain Ffraid) is a bay in western Pembrokeshire, West Wales. Either Skomer Island or the mainland extremity of Wooltack Point at the western end of the Marloes Peninsula marks the southern limit of the bay whilst its northern limit is marked by Ramsey Island off St David's Head. The mouth of the bay is about wide and extends some eastwards from this line. Geology The northern and southern shores of the bay are mainly rocky in nature, backed by cliffs up to high. Its eastern shore comprises a series of large and small sandy beaches between rocky sections. The geological exposures around the bay reveal great complexity with considerable folding and faulting of the strata. The cliffs of its southern shore are formed from sandstones of Ordovician and Devonian age together with a suite of both intrusive and extrusive igneous rocks, some of which are Precambrian in age. Those in the north comprise a series of Precambrian and Cambrian age rocks of both sedi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
England
England is a country that is part of the United Kingdom. It shares land borders with Wales to its west and Scotland to its north. The Irish Sea lies northwest and the Celtic Sea to the southwest. It is separated from continental Europe by the North Sea to the east and the English Channel to the south. The country covers five-eighths of the island of Great Britain, which lies in the North Atlantic, and includes over 100 smaller islands, such as the Isles of Scilly and the Isle of Wight. The area now called England was first inhabited by modern humans during the Upper Paleolithic period, but takes its name from the Angles, a Germanic tribe deriving its name from the Anglia peninsula, who settled during the 5th and 6th centuries. England became a unified state in the 10th century and has had a significant cultural and legal impact on the wider world since the Age of Discovery, which began during the 15th century. The English language, the Anglican Church, and Engli ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carboniferous Limestone
Carboniferous Limestone is a collective term for the succession of limestones occurring widely throughout Great Britain and Ireland that were deposited during the Dinantian Epoch of the Carboniferous Period. These rocks formed between 363 and 325 million years ago. Within England and Wales, the entire limestone succession, which includes subordinate mudstones and some thin sandstones, is known as the Carboniferous Limestone Supergroup. Depositional basins Within Great Britain the suite of rocks known traditionally as the Carboniferous Limestone Series was deposited as marine sediments in three distinct ‘provinces’ separated by contemporary landmasses. One of these landmasses was the Wales-London-Brabant Massif, an east–west aligned belt of land stretching through central Wales and the English Midlands to East Anglia and on into Belgium. The limestones deposited to its south form a distinct South Wales-Mendip province which extends from Pembrokeshire in the west through ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Waterfall Country (Wales)
Waterfall Country (or sometimes Waterfalls Country) is an English name often given to the Vale of Neath in South Wales. The tourist area around the head of the valley has an unusually large number of publicly accessible waterfalls. The area is not officially defined but generally includes the group of falls on the Nedd Fechan, Pyrddin, Hepste and Mellte rivers, all of which lie between the villages of Pontneddfechan and Ystradfellte in the Brecon Beacons National Park. Each of these falls lies within or on the boundary of the county of Powys. A few miles further west are Henrhyd Falls on the Nant Llech, a tributary of the Tawe and to the south-west are Melin Court Falls on the Melin Court Brook, a tributary of the River Neath. These, along with Aberdulais Falls on the Dulais, a further tributary of the Neath are also encompassed by the term 'Waterfall/s Country' by some writers. Collectively the falls are one of the more popular natural attractions in South Wales, which has c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fault (geology)
In geology, a fault is a planar fracture or discontinuity in a volume of rock across which there has been significant displacement as a result of rock-mass movements. Large faults within Earth's crust result from the action of plate tectonic forces, with the largest forming the boundaries between the plates, such as the megathrust faults of subduction zones or transform faults. Energy release associated with rapid movement on active faults is the cause of most earthquakes. Faults may also displace slowly, by aseismic creep. A ''fault plane'' is the plane that represents the fracture surface of a fault. A ''fault trace'' or ''fault line'' is a place where the fault can be seen or mapped on the surface. A fault trace is also the line commonly plotted on geologic maps to represent a fault. A ''fault zone'' is a cluster of parallel faults. However, the term is also used for the zone of crushed rock along a single fault. Prolonged motion along closely spaced faults can blur the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mynydd Llangynidr
Mynydd Llangynidr is a mountain in the Brecon Beacons National Park largely in the county of Powys, south Wales. Its southern slopes extend into the northernmost parts of the county borough of Blaenau Gwent. It is named from the village of Llangynidr which sits in the valley of the River Usk to the north of it. It is essentially an undulating plateau rising in the west to a height of 557m at Garn Fawr at OS grid ref SO 123151. A secondary high point is achieved at a point marked by a trig point at SO 147159. To the north the hill overlooks the valleys of Dyffryn Crawnon and Cwm Claisfer, themselves tributary valleys of the Usk. The shallow upper valley (Cwm Carneilw) of the Ebbw River reaches into the plateau in the southeast whilst the upper reaches of the Sirhowy Valley and its tributary the Nant Trefil define its western margins. A further tributary, the Nant Milgatw, reaches in from the south whilst the sharp edge of Rassau Industrial Estate also defines a part of its southern ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mynydd Llangatwg
Mynydd Llangatwg or Llangattock Mountain is a hill in the Brecon Beacons National Park in the county of Powys, south Wales. It is named from the village of Llangatwg (or ' Llangattock') which sits in the valley of the River Usk to the north of it. It is essentially an undulating plateau rising in the west to a height of at and in the east to a height of at Hen Dy-aderyn / Twr Pen-cyrn. This spot is marked by a trig point. The shallow pool of Pwll Gwy-rhoc sits in a broad depression towards the northern edge of the plateau whilst a smaller pool frequently occupies a large shakehole a few hundred metres to its west. The hill forms an impressive northern scarp overlooking the Usk valley and commonly referred to as the Llangattock Escarpment. Its southern margins are more subdued. Its eastern end is defined by the drops into the Clydach Gorge. Beyond the B4560 to the west the hill merges with Mynydd Llangynidr which has a similar character. Particular features of note include 'T ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Brecon Beacons National Park
The Brecon Beacons National Park ( cy, Parc Cenedlaethol Bannau Brycheiniog) is one of three national parks in Wales, and is centred on the Brecon Beacons range of hills in southern Wales. It includes the Black Mountain (range), Black Mountain ( cy, Y Mynydd Du) in the west, Fforest Fawr (translates as 'great forest') and the Brecon Beacons in the centre and the Black Mountains, Wales, Black Mountains ( cy, Y Mynydd Du or Mynyddoedd Duon) in the east. Description The Brecon Beacons National Park was established in 1957, the last of the three Welsh parks designated after Snowdonia in 1951 and the Pembrokeshire Coast in 1952. It stretches from Llandeilo in the west to Hay-on-Wye in the northeast and Pontypool in the southeast, covering and encompassing four main regions – the Black Mountain (range), Black Mountain in the west, reaching 802 metres (2631 feet) at Fan Brycheiniog, Fforest Fawr and the Brecon Beacons in the centre, including the highest summit in the park and in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gwaun Cefnygarreg , river in Pembrokeshire
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Gwaun may refer to the following places in Wales: *Cwm Gwaun, village and community in Pembrokeshire *Gwaun-Cae-Gurwen, village in Neath Port Talbot *River Gwaun A river is a natural flowing watercourse, usually freshwater, flowing towards an ocean, sea, lake or another river. In some cases, a river flows into the ground and becomes dry at the end of its course without reaching another body of wa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tair Carn Uchaf
is a hill in the Brecon Beacons National Park ( cy, Parc Cenedlaethol Bannau Brycheiniog) in the county of Carmarthenshire, Wales. Its summit sits atop a plateau-like ridge at above sea level and is marked by one of the three huge cairns which give the mountain its name. The main ridge leads southwest towards the subsidiary top of Tair Carn Isaf ("Lower Three Cairns", ), which hosts further cairns. The summit of this top lies at , whilst a trig point just to its southwest lies at a height of 459 metres (1505'). To the south of the main ridge lies the subsidiary peak of Drysgol which reaches a height of . Geology and drainage To the south is the Amman Valley into which flow the streams of Nant Pedol and Nant-y-ffin or Berach whilst the Nant Gwythwch drains westwards into the River Loughor. Rainwater falling on the hill's northern slopes is likely to spend part of its journey underground on account of the band of Carboniferous Limestone which sweeps across this area from east ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carreg Dwfn
Carreg Dwfn (also referred to as Careg Dwfn and Carregydwfn and referred to also as Careg-y-dwfan. ) is a hill four miles southeast of Llandeilo and just to the south of the village of Trap in the county of Carmarthenshire, south Wales. It lies at the western extremity of the Brecon Beacons National Park and Fforest Fawr Geopark. Its summit at is towards the eastern end of a rocky east-west-aligned ridge. Geology The hill is formed from the coarse Twrch Sandstone (formerly known as the Basal Grit) laid down during the Namurian stage of the Carboniferous period. It is defined by faults to east and west. There are a handful of disused gritstone quarries on the southern slope of the hill. Quarrying rights at these sites were stopped by the Brecon Beacons National Park Authority in 2008. To its north is the large Craigyrodyn Quarry which worked the Carboniferous Limestone Carboniferous Limestone is a collective term for the succession of limestones occurring widely throughout G ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Marine Band (geology)
A marine band, in geology, is a bed of rock, commonly black or dark grey shale, containing an abundance of fossils of marine organisms. These strata represent episodes of flooding by seawater and are important in enabling the comparison or correlation of rock sequences in different localities. Examples * Maltby Marine Band – England * Milngavie Marine Band – Scotland * Redhall Marine Band – Scotland See also *Marine transgression A marine transgression is a geologic event during which sea level rises relative to the land and the shoreline moves toward higher ground, which results in flooding. Transgressions can be caused by the land sinking or by the ocean basins filling ... References Fossils Shale Mudstone {{geology-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
