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Cribarth Disturbance
The Cribarth Disturbance is a geological structure forming a lineament which stretches across south Wales from Swansea up the Swansea Valley then northeastwards to Brecon and beyond. It consists of both a series of faults and associated folds which were active during the mountain-building period known as the Variscan orogeny. This line of weakness probably featured in the earlier Caledonian Orogeny and perhaps reflects a more ancient line of weakness in the basement rocks. It is also known (in part) as the Tawe Valley Disturbance or the Swansea Valley Disturbance.〔Howells, M.F. 2007 'British Regional Geology: Wales' Keyworth, Nottingham, British Geological Survey〕
==Influence on the landscape==
The Disturbance is responsible for a number of significant landscape features along its 50 km length. Prominent amongst these is the Swansea Valley, formed both by glacial action during the ice ages and river erosion along this line of weakness in the Earth's crust between Abercraf and Swansea. It is now occupied by the River Tawe. The geologically complex mini-mountain of Cribarth also lies on the Disturbance and indeed gives its name to the feature.〔Ordnance Survey Explorer maps 165 'Swansea', OL12 'Brecon Beacons National Park: western area'〕〔British Geological Survey 1:50,000 map sheets 230 'Ammanford', 231 'Merthyr Tydfil', 247 'Swansea' & accompanying memoirs〕
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