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The Cornubian batholith is a large mass of granite rock, formed about 280 million years ago, which lies beneath much of Cornwall and Devon in the South West Peninsula of England. The main exposed masses of granite are seen at Dartmoor , Bodmin Moor , St Austell , Carnmenellis , Land's End and the Isles of Scilly .
The geology of Cornwall, England, is dominated by its granite backbone, part of the Cornubian batholith, formed during the Variscan orogeny. Around this is an extensive metamorphic aureole (known locally as killas ) formed in the mainly Devonian slates that make up most of the rest of the county.
The Cornubian Massif was an upland area and source of sediment in southwest England during parts of the Late Permian to Early Cretaceous period and through most of the Cenozoic. In extent it covered approximately the current area of Devon and Cornwall .
The largest other islands are off the south coast: Looe Island and St Michael's Mount. The sea to the north of Cornwall is the Celtic Sea; before the usage of Celtic Sea it was part of the Bristol Channel. On Joel Gascoyne's map of 1699 this part of the Atlantic Ocean was named "The North Sea or Severn Channel". [2]
Gravity anomaly maps of the British Isles are interpreted as indicating the presence of granite plutons in the following areas. The list is not exhaustive: Galloway, UK; Cheviot Hills, UK; Mountains of Mourne, UK; Connemara, Ireland; County Donegal, Ireland; South West England (Cornubian batholith and Haig Fras granite), UK; Askrigg Block ...
South Downs; London-Brabant Massif; Cornubian batholith – Early Permian intrusion in the South West of England, forming moors where exposed at the surface, such as Dartmoor; Lizard Complex – a piece of obducted oceanic crust, (i.e. an Ophiolite). Iapetus Suture – line of closure of the Iapetus suture.
Cornwall (/ ˈ k ɔːr n w ɔː l,-w əl / ⓘ; [5] Cornish: Kernow [ˈkɛrnɔʊ] or [6]) is a ceremonial county in South West England. [7] It is recognised by Cornish and Celtic political groups as one of the Celtic nations, and is the homeland of the Cornish people.
Many more native South West students are prepared to go to the north of England, than northern students are prepared to study in the South West. Once graduated, around 50% stay in the region, with 15% each going to London or the South East (around 80% find work in the south of England).