Disturbance (geology)

A disturbance is a linear zone of disturbed rock strata stretching for many miles across country which comprises a combination of folding and faulting. The British Geological Survey record a number of such features in South Wales including the Neath Disturbance, Pontyclerc Disturbance, Carreg Cennen Disturbance and the Cribarth Disturbance, the latter sometimes also known (at least in part) as the Tawe Valley or Swansea Valley Disturbance. The southwestward continuation of the Carreg Cennen Disturbance is known as the Llandyfaelog Disturbance.

Other examples in Wales and the border counties of England include the Clun Forest, Saron, Trimsaran and Llannon (or 'Llanon') disturbances.[1] The Silverdale[2] and Burtreeford disturbances[3] are found in northern England.

List of disturbances

The following named features comprise both faulting and folding;

Sortable table of named disturbances
Disturbance name County Country BGS map sheet book reference/s
Burtreeford Disturbance England E&W 19, 31
Caerbryn Disturbance Carmarthenshire Wales E&W 230
Carreg Cennen Disturbance Wales E&W 230
Clun Forest Disturbance Shropshire England E&W 165 BGS memoir sheet 165[4]
Cribarth Disturbance Wales E&W 230, 231
Llandyfaelog Disturbance Carmarthenshire Wales E&W 231
Llannon (or Llanon) Disturbance Carmarthenshire Wales E&W 230
Neath Disturbance Wales E&W 231
Pontyclerc Disturbance Carmarthenshire Wales E&W 230
Saron Disturbance Carmarthenshire Wales E&W 230
Silverdale Disturbance England E&W 25
Stockdale Disturbance England GCR29, p205[5]
Trimsaran Disturbance Wales

See also List of geological folds in Great Britain.

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References
  1. British Geological Survey 1:50,000 map sheets 214, 215, 231 'Merthyr Tydfil', 232 'Abergavenny', 247 'Swansea' & accompanying memoirs
  2. Brenchley PJ & Rawson PF (eds) 2006 The Geology of England and Wales (2nd edn), The Geological Society, London (p135)
  3. sheets 25 & 31 of 1:50K scale map geological map series of British Geological Survey
  4. Cave, R; Hains, B A (2001). Geology of the Country around Montgomery and the Ordovician rocks of the Shelve area (1st ed.). London: BGS; NERC;The Stationery Office. p. 127. ISBN 0118845527.
  5. Cossey et al, 2004, British Lower Carboniferous Stratigraphy, Geological Conservation Review Series, no 29, Joint Nature Conservation Committee, Peterborough
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