Disturbance (geology)
In 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
[edit]The following named features comprise both faulting and folding;
| 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
[edit]References
[edit]- ^ British Geological Survey 1:50,000 map sheets 214, 215, 231 'Merthyr Tydfil', 232 'Abergavenny', 247 'Swansea' & accompanying memoirs
- ^ Brenchley PJ & Rawson PF (eds) 2006 The Geology of England and Wales (2nd edn), The Geological Society, London (p135)
- ^ sheets 25 & 31 of 1:50K scale map geological map series of British Geological Survey
- ^ 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.
- ^ Cossey et al, 2004, British Lower Carboniferous Stratigraphy, Geological Conservation Review Series, no 29, Joint Nature Conservation Committee, Peterborough
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