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Rhobell Fawr
Rhobell Fawr is the site of an ancient volcano that was active during the Early Ordovician period in the Arenig range within the Snowdonia National Park. Despite its modest height of 734 m (2,408 feet), it is a mountain with views of higher peaks all around, including the north face of Cadair Idris and distant Snowdon. The paths are not well trodden, but there is a distinct path up from Bwlch Goriwared, a couple of miles north-north-east of the small village of Llanfachreth. References {{reflist External links www.geograph.co.uk : photos of Rhobell Fawr and surrounding area Mountains and hills of Snowdonia Marilyns of Wales Nuttalls Hewitts of Wales Volcanoes of Wales Ordovician volcanoes Brithdir and Llanfachreth Mountains and hills of Gwynedd ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arenig Fawr
is a mountain in Snowdonia, North Wales, close to Llyn Celyn reservoir, alongside the A4212 road, A4212 between Trawsfynydd and Bala, Gwynedd, Bala. Location Arenig Fawr is the highest member of the Arenigs, Arenig range, with , a smaller neighbouring mountain, lying to the north. It is surrounded by Moel Llyfnant to the west, Rhobell Fawr to the south and Mynydd Nodol to the east. Ascent The easy-to-moderate climb to the summit takes about 2½ hours from Llyn Celyn. There are no readily identifiable footpaths but the route is marked by an old wire boundary fence. Beneath the mountain is Llyn Arenig Fawr, a reservoir providing drinking water to Bala, Gwynedd, Bala and the surrounding villages. The summit, which is also known as , has a trig point and a memorial to eight American aircrew who died when their Flying Fortress bomber B-17F #42-3124 crashed on 4 August 1943. Some of the crash wreckage is still scattered across the hillside 300 m (330 yds) from the memorial locatio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arenig
In geology, the Arenig (or Arenigian) is a time interval during the Ordovician period and also the suite of rocks which were deposited during this interval. History The term was first used by Adam Sedgwick in 1847 with reference to the "Arenig Ashes and Porphyries" in the neighbourhood of Arenig Fawr, in Merioneth, North Wales. The rock-succession in the Arenig district has been recognized by W. G. Fearnsides (“On the Geology of Arenig Fawr and Moel Llanfnant", Q.J.G.S. vol. lxi., 1905, pp. 608–640, with maps). The above succession is divisible into: # A lower series of gritty and calcareous sediments, the "Arenig Series" as it is now understood; # A middle series, mainly volcanic, with shale, the "Llandeilo Series"; and # The shale and limestones of the Bala or Caradoc Stage. It was to the middle series (2) that Sedgwick first applied the term "Arenig". In the typical region and in North Wales generally the Arenig series appears to be unconformable upon the Camb ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ordovician Volcanoes
The Ordovician ( ) is a geologic period and system, the second of six periods of the Paleozoic Era, and the second of twelve periods of the Phanerozoic Eon. The Ordovician spans 41.6 million years from the end of the Cambrian Period Ma (million years ago) to the start of the Silurian Period Ma. The Ordovician, named after the Welsh tribe of the Ordovices, was defined by Charles Lapworth in 1879 to resolve a dispute between followers of Adam Sedgwick and Roderick Murchison, who were placing the same rock beds in North Wales in the Cambrian and Silurian systems, respectively. Lapworth recognized that the fossil fauna in the disputed strata were different from those of either the Cambrian or the Silurian systems, and placed them in a system of their own. The Ordovician received international approval in 1960 (forty years after Lapworth's death), when it was adopted as an official period of the Paleozoic Era by the International Geological Congress. Life continued to flour ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Volcanoes Of Wales
A volcano is commonly defined as a vent or fissure in the crust of a planetary-mass object, such as Earth, that allows hot lava, volcanic ash, and gases to escape from a magma chamber below the surface. On Earth, volcanoes are most often found where tectonic plates are diverging or converging, and because most of Earth's plate boundaries are underwater, most volcanoes are found underwater. For example, a mid-ocean ridge, such as the Mid-Atlantic Ridge, has volcanoes caused by divergent tectonic plates whereas the Pacific Ring of Fire has volcanoes caused by convergent tectonic plates. Volcanoes resulting from divergent tectonic activity are usually non-explosive whereas those resulting from convergent tectonic activity cause violent eruptions."Mid-ocean ridge tectonics, volcanism and geomorphology." Geology 26, no. 455 (2001): 458. https://macdonald.faculty.geol.ucsb.edu/papers/Macdonald%20Mid-Ocean%20Ridge%20Tectonics.pdf Volcanoes can also form where there is stretching a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nuttalls
Nuttall may refer to: People * Nuttall (name) * Nuttall baronets Nature * Nuttall's oak, a fast-growing large deciduous oak tree native to North America * Nuttall's woodpecker, a species of woodpecker found in oak woodlands of California * Nuttall sandstone, a very hard type of sandstone; see New River Gorge National River * Nuttall's toothwort, a species of cardamine flower. Places * Nuttall, Virginia, United States * Nuttall railway station, Nuttall village, Nasirabad, Balochistan, Pakistan * Nuttall mountains, hills that are over with a prominence above : ** List of Nuttall mountains in England ** List of Nuttall mountains in Wales Other uses * BAM Nuttall, a British construction company * Blackman–Nuttall window, a mathematical function used in signal processing—see Window function * Codex Zouche-Nuttall The Codex Zouche-Nuttall or Codex Tonindeye is an accordion-folded pre-Columbian document of Mixtec pictography, now in the collections of the British M ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Marilyns Of Wales
This is a list of Marilyn hills and mountains in the United Kingdom, Ireland and surrounding islands and sea stacks. Marilyns are defined as peaks with a prominence of or more, regardless of height or any other merit (e.g. topographic isolation, as used in Munros). Thus, Marilyns can be mountains, with a height above , or relatively small hills. there were 2,010 recorded Marilyns. Definition The Marilyn classification was created by Alan Dawson in his 1992 book ''The Relative Hills of Britain''. The name Marilyn was coined by Dawson as a punning contrast to the ''Munro'' classification of Scottish mountains above , but which has no explicit prominence threshold, being homophonous with (Marilyn) '' Monroe''. The list of Marilyns was extended to Ireland by Clem Clements. Marilyn was the first of several subsequent British Isles classifications that rely solely on prominence, including the P600s, the HuMPs, and the TuMPs. Topographic prominence is more difficult to est ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mountains And Hills Of Snowdonia
A mountain is an elevated portion of the Earth's crust, generally with steep sides that show significant exposed bedrock. Although definitions vary, a mountain may differ from a plateau in having a limited summit area, and is usually higher than a hill, typically rising at least above the surrounding land. A few mountains are isolated summits, but most occur in mountain ranges. Mountains are formed through tectonic forces, erosion, or volcanism, which act on time scales of up to tens of millions of years. Once mountain building ceases, mountains are slowly leveled through the action of weathering, through slumping and other forms of mass wasting, as well as through erosion by rivers and glaciers. High elevations on mountains produce colder climates than at sea level at similar latitude. These colder climates strongly affect the ecosystems of mountains: different elevations have different plants and animals. Because of the less hospitable terrain and climate, mountains ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Llanfachreth
Llanfachreth is a village approximately three miles north-east of Dolgellau, Gwynedd, in the Community (Wales), community of Brithdir and Llanfachreth within the historic boundaries of Merionethshire (), Wales. History Llanfachreth is a small village near Dolgellau in north west Wales; it was greatly influenced by the local Nannau, Wales, Nannau family. The village is mentioned in the Imperial Gazetteer of England and Wales by John Marius Wilson in 1872 : ''"LLANFACHRETH, a village and a parish in Dolgelly district, Merioneth. The village stands on the river Mawddach, at the N foot of Moel-Orthrwm, 3¼ miles NNE of Dolgelly r. station; and has a post office under Corwen, and fairs on 22 April, 30 June, 15 Aug., and 23 Oct. The parish comprises the townships of Nannau-Isafon and Nannau-Uwchafon. ..."'' The parish emerged from the ancient commote of Talybont, Meirionnydd. It is in the Mid and West Wales region, and is on a tributary of the Afon Mawddach. The village is in the va ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Snowdon
Snowdon (), or (), is a mountain in Snowdonia in North Wales. It has an elevation of above sea level, which makes it both the highest mountain in Wales and the highest in the British Isles south of the Scottish Highlands. Snowdon is designated a national nature reserve for its rare flora and fauna, and is located within Snowdonia National Park. The rocks that form Snowdon were produced by volcanoes in the Ordovician period, and the massif has been extensively sculpted by glaciation, forming the pyramidal peak of Snowdon and the arêtes of Crib Goch and Y Lliwedd. It is part of the larger Snowdon range, which includes Garnedd Ugain, Yr Aran, and Moel Eilio. There are several lakes on the mountain, the largest of which is Llyn Lydaw (), located on the eastern flank at . The mountain has been described as the "busiest in the United Kingdom", and in 2022 it was climbed by 543,541 walkers. There are six main paths to the summit, the most popular of which begins ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cadair Idris
Cadair Idris or Cader Idris is a mountain in the Meirionnydd area of Gwynedd, Wales. It lies at the southern end of the Snowdonia National Park near the town of Dolgellau. The peak, which is one of the most popular in Wales for walkers and hiking, hikers, is composed largely of Ordovician igneous rocks, with classic glaciation, glacial erosion features such as Cirque, cwms, moraines, Glacial striations, striated rocks, and roche moutonnée, roches moutonnées. Etymology means 'Idris's Chair'. Idris (giant), Idris is usually taken to be the name of a giant or, alternatively, it may refer to (or ), a 7th-century prince of Meirionnydd who won a battle against the Irish on the mountain. was in fact referred to as ('Idris the Giant') in some mediaeval genealogies of Meirionydd. The basic meaning of the word (Middle Welsh/Early Modern Welsh or ) is 'seat, chair' (borrowed from the Greek language, Greek , , 'chair'). In place names can mean 'stronghold, fort, fortress' or 'mount ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mountain
A mountain is an elevated portion of the Earth's crust, generally with steep sides that show significant exposed bedrock. Although definitions vary, a mountain may differ from a plateau in having a limited summit area, and is usually higher than a hill, typically rising at least above the surrounding land. A few mountains are inselberg, isolated summits, but most occur in mountain ranges. mountain formation, Mountains are formed through tectonic plate, tectonic forces, erosion, or volcanism, which act on time scales of up to tens of millions of years. Once mountain building ceases, mountains are slowly leveled through the action of weathering, through Slump (geology), slumping and other forms of mass wasting, as well as through erosion by rivers and glaciers. High elevations on mountains produce Alpine climate, colder climates than at sea level at similar latitude. These colder climates strongly affect the Montane ecosystems, ecosystems of mountains: different elevations hav ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
