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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 Llanfachreth is a settlement approximately three miles north-east of Dolgellau, Gwynedd, in the community of Brithdir and Llanfachreth within the historic boundaries of Merionethshire ( cy, Meirionnydd, Sir Feirionnydd), Wales. History Llan .... 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 Llan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arenig Fawr
Arenig Fawr ( en, Great High Ground) is a mountain in Snowdonia, North Wales, close to Llyn Celyn reservoir, alongside the A4212 between Trawsfynydd and Bala. Location Arenig Fawr is the highest member of the Arenig range, with Arenig Fach ( en, Small High Ground), 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 and the surrounding villages. The summit, which is also known as Moel yr Eglwys ( en, Bare hill of the church), 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 sca ... [...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 Cambri ... [...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. The Ordovician spans 41.6 million years from the end of the Cambrian Period million years ago (Mya) to the start of the Silurian Period Mya. 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 flourish during the Ordovician as it did in the earlier Cambrian Perio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Volcanoes Of Wales
A volcano is a rupture 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 most 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 can also form where there is stretching and thinning of the crust's plates, such as in the East African Rift and the Wells Gray-Clearwater volcanic field and Rio Grande rift in North America. Volcanism away from plate boundaries has been postulated to arise from upwelling diapirs from the core–mantle boundary, deep in the Earth. This results in hotspot volcanism, of which the Hawaiian hotspot is an example. Volcanoes are usually not created where two tectonic plates slide pa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
