Carreg Cennen Disturbance
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The Carreg Cennen Disturbance is a zone of geological faults and folds in south and mid Wales which forms a part of both the Church Stretton Fault Zone and the Welsh Borderland Fault System. To the southwest it is known as the 'Llandyfaelog Disturbance'.[1]
These structures which stretch from Pembrokeshire to Shropshire are thought to have originated during the Caledonian Orogeny or mountain-building period.
It is most impressively revealed at Carreg Cennen[2] itself where the mediaeval castle sits perched atop a 90m cliff of Carboniferous Limestone which is caught up within a faulted block sitting between two arms of the Disturbance. It is probably also responsible for the alignment of the Afon Cennen to the west of this location where the river follows the line of the fault for over 2.5 mi / 4 km.