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 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 disturbances. The Silverdale and Burtreeford disturbances are found in northern England.

List of disturbances

The following named features comprise both faulting and folding;
Disturbance nameCountyCountryBGS map sheetbook reference/s
Burtreeford DisturbanceEnglandE&W 19, 31
Caerbryn DisturbanceCarmarthenshireWalesE&W 230
Carreg Cennen DisturbanceWalesE&W 230
Clun Forest DisturbanceShropshireEnglandE&W 165BGS memoir sheet 165
Cribarth DisturbanceWalesE&W 230, 231
Llandyfaelog DisturbanceCarmarthenshireWalesE&W 231
Llannon DisturbanceCarmarthenshireWalesE&W 230
Neath DisturbanceWalesE&W 231
Pontyclerc DisturbanceCarmarthenshireWalesE&W 230
Saron DisturbanceCarmarthenshireWalesE&W 230
Silverdale DisturbanceEnglandE&W 25
Stockdale DisturbanceEnglandGCR29, p205
Trimsaran DisturbanceWales

See also List of geological folds in Great Britain.