The Carreg Cennen Disturbance is a zone of geological faults and folds in south and mid Wales which forms a part of both the and the Welsh Borderland Fault System. To the southwest it is known as the 'Llandyfaelog Disturbance'. These structures which stretch from Pembrokeshire to Shropshire are thought to have originated during the Caledonian Orogeny or mountain-building period.