The Cwm Llwyd Fault is a fault in the west of the Black Mountain of South Wales. It runs north, parallel to the A4069 road, for over 4 km from near Brynaman to meet the Carreg Cennen Disturbance near Brest Cwm Llwyd.[1] It moved as a sinistral (left lateral) strike-slip fault during the Variscan Orogeny. Together with the Llwyn Celyn Fault it formed a left-stepping offset that created a pull apart structure, which preserved the Cwm Llwyd Outlier of Namurian rocks.[2]
See also edit
References edit
- ^ "Geological faults in the Geopark". Fforest Fawr Geopark. 2011. Retrieved 16 March 2014.
- ^ Walsh, P.T.; Barclay W.T.; Battiau-Queney Y. (2007). "The Cwm Llwyd Outlier, Carmarthenshire, South-West Wales – Britain's deepest karstic subsidence or Variscan pull-apart structure?". Geological Journal. 42 (1): 1–23. doi:10.1002/gj.1061. S2CID 129320893.
51°50′21″N 3°52′22″W / 51.83917°N 3.87278°W
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