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Afon Dringarth
The Afon Dringarth (or simply ''Tringarth'') is a river in Powys, Wales and wholly contained within the Brecon Beacons National Park. Its headwater streams drain the eastern slopes of Fan Dringarth (which is probably named after the river), the southern slopes of Craig Cerrig-gleisiad and the western slopes of Fan Fawr. The river flows south-southwest for about 6 km / 3.5 mi to its confluence with the Afon Llia one mile north of the village of Ystradfellte, continuing south as the Afon Mellte. The river may derive its name from the hill immediately to its west, Fan Dringarth. The Afon Dringarth flows across ground formed from the Old Red Sandstone laid down during the Devonian period. The presence of areas of glacial till reveals that the area was inundated by ice during the ice ages. The waters of the river were impounded by a dam during the early 20th century to form Ystradfellte Reservoir. External links Images of Afon Dringarth and area on Geograph website Refere ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Powys
Powys (; ) is a Local government in Wales#Principal areas, county and Preserved counties of Wales, preserved county in Wales. It is named after the Kingdom of Powys which was a Welsh succession of states, successor state, petty kingdom and principality that emerged during the Middle Ages following the end of Roman rule in Britain. Geography Powys covers the historic counties of Montgomeryshire and Radnorshire, most of Brecknockshire, and part of Denbighshire (historic), historic Denbighshire. With an area of about , it is now the largest administrative area in Wales by land and area (Dyfed was until 1996 before several Preserved counties of Wales, former counties created by the Local Government Act 1972 were abolished). It is bounded to the north by Gwynedd, Denbighshire and Wrexham County Borough; to the west by Ceredigion and Carmarthenshire; to the east by Shropshire and Herefordshire; and to the south by Rhondda Cynon Taf, Merthyr Tydfil County Borough, Caerphilly County Bor ... [...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] |
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] |
Fan Dringarth
Fan Llia is a subsidiary summit of Fan Fawr in the Fforest Fawr section of the Brecon Beacons National Park, Wales. In common with other peaks in the Fforest Fawr uplands it lies within the county of Powys. The hill has the form of a broad ridge aligned south-south-west to north-north-east peaking at an altitude of 632 m. It has a subsidiary top to the north which is known as Fan Dringarth and which attains a height of 617 m. Its broad northern ridge is eventually truncated by the cliffs of Craig Cwm-du. A number of features of archaeological interest are to be found on its flanks including several house platforms. Geology The hill is formed largely from sandstones of the Brownstones Formation of the Old Red Sandstone dating from the Devonian period. Its southernmost slopes (around Cefn Perfedd) are formed in Plateau Beds Formation sandstones and an area in the north-east is underlain by sandstones and mudstones of the Senni Beds Formation. Rock exposures are infrequent − ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Craig Cerrig-gleisiad
Craig Cerrig-gleisiad is a subsidiary summit of Fan Fawr in the Fforest Fawr section of the Brecon Beacons National Park, South Wales. It makes up half of the Craig Cerrig-gleisiad and Fan Frynych National Nature Reserve with its sister peak Fan Frynych. The summit is marked by a pile of stones, and sits on the edge of steep north facing cliffs which provide one of the few habitats for Arctic–alpine plants this far south in the British Isles. To the south-west is Fan Llia. Geology The outstanding feature of the mountain is the L-shaped glacial cwm which faces to the northeast. Its modern form is considered to be the result of a complex history of both glacial action and rock-slope failure, a portion of the west wall having collapsed after the main part of the last ice age. Some of the debris was re-worked during the Loch Lomond Stadial and parts stretch as far as the A470 road.Richard Shakesby, Classic Landforms of the Brecon Beacons, 2002, Geological Association Landform G ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fan Fawr
Fan Fawr ( Welsh 'great peak') is a mountain in the Fforest Fawr section of the Brecon Beacons National Park, in Powys, Wales and over 734 m (2,408 ft) high. The summit overlooks the steep eastern face and is marked by a cairn. Unusually, the trig point on this hill does not sit at the summit but 600 m to the south-west on a subsidiary spur. The hill is drained to the west by streams flowing into the Afon Dringarth and to the east by streams draining into the Taf Fawr. The Dringarth is dammed to the west to form Ystradfellte Reservoir as is the Taf Fawr east of the hill to form Beacons Reservoir. To the north-east water flows into the Afon Tarell, a tributary of the River Usk whilst to the south the headwaters of the Afon y Waun conduct water to the Afon Hepste and eventually to the River Neath. Geology The hill is largely formed from sandstones of the Brownstones Formation of the Old Red Sandstone which were laid down during the Devonian period. On the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Afon Llia
The Afon Llia is a short river in Powys, Wales, and which is wholly contained within the Brecon Beacons National Park. Several streams draining the eastern slopes of Fan Nedd and the western slopes of Fan Dringarth in the Fforest Fawr section of the national park meet to form the river, which then flows southwards for to its confluence with the Afon Dringarth, the combined waters continuing south as the Afon Mellte. The name probably derives from the Welsh root ''lly–'' found in ''llyfu, llyo'' ('lick, lap') but it has probably been influenced by the local pronunciation of ''lleiaf'' ('smallest'). The river flows over ground formed from Old Red Sandstone rocks laid down during the Devonian period. The valley was inundated by ice during the last glacial period as evidenced by the low mounds of moraine present in the valley and through which the river has since cut. Historical route The valley of the Llia provides one of the lower passes—summit height —throug ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ystradfellte
Ystradfellte is a village and community in Powys, Wales, about north of Hirwaun, with 556 inhabitants. It belongs to the historic county of Brecknockshire (Breconshire) and the Fforest Fawr area of the Brecon Beacons National Park, beside the Afon Mellte river. The village is linked by minor roads with Heol Senni to the north and the A4059 north of Penderyn, and with Pontneddfechan, which lies in the community, at the head of the Vale of Neath to the south. History Ystradfellte is chiefly known in history as the place where the Welsh nobleman and rebel leader Llywelyn Bren surrendered at the end of his revolt of 1316. Llywelyn gave himself up on the condition that his men be spared, but was himself put to death in 1318 at Cardiff. The village was connected to mains electricity in 1960, as one of the last communities in the whole of England and Wales to be wired. Outlying properties in the Nedd Fechan valley had to wait until December 2005 for their connection. Features The v ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Afon Mellte
Afon Mellte or the River Mellte is a river in south Wales. It is formed by the confluence of the Afon Llia and the Afon Dringarth. It then flows south through the village of Ystradfellte to Pontneddfechan where it joins with the Nedd Fechan to become the River Neath ( cy, 'Afon Nedd'). The river derives its name from 'mellt' - the Welsh word for 'lightning' - after its tendency to rise and fall rapidly in response to heavy rainfall. Underground section The entire river runs underground for 1/2 km at Porth yr Ogof as it crosses the Carboniferous Limestone outcrop. It resurges at Pwll Glas. There are fifteen known entrances to the cave system. It is a complex maze of passageways, large and small, mostly developed along one or two major bedding planes. In extreme flood conditions the entire cave can flood to the roof. It is used heavily by school and adventure groups though sections of the cave can be hazardous for the unwary. There have been a number of fatalities ove ... [...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 Period
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] |
Glacial Till
image:Geschiebemergel.JPG, Closeup of glacial till. Note that the larger grains (pebbles and gravel) in the till are completely surrounded by the matrix of finer material (silt and sand), and this characteristic, known as ''matrix support'', is diagnostic of till. image:Glacial till exposed in roadcut-750px.jpg, Glacial till with tufts of grass Till or glacial till is unsorted glacier, glacial sediment. Till is derived from the erosion and entrainment of material by the moving ice of a glacier. It is deposited some distance down-ice to form terminal, lateral, medial and ground moraines. Till is classified into primary deposits, laid down directly by glaciers, and secondary deposits, reworked by fluvial transport and other processes. Description Till is a form of '' glacial drift'', which is rock material transported by a glacier and deposited directly from the ice or from running water emerging from the ice. It is distinguished from other forms of drift in that it is depos ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
