Cwm Llwyd Fault

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 4km 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

References

  1. ↑ "Geological faults in the Geopark". Fforest Fawr Geopark. 2011. Retrieved 2014-03-16.
  2. ↑ 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.

Coordinates: 51°50′21″N 3°52′22″W / 51.83917°N 3.87278°W