Cwm Llwyd Fault Explained

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

References

51.8392°N -3.8728°W

Notes and References

  1. Web site: Geological faults in the Geopark . Fforest Fawr Geopark . 2011 . 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. 10.1002/gj.1061. 129320893 .