The
Cribarth Disturbance is a geological structure forming a
lineament which stretches across south
Wales from
Swansea up the
Swansea Valley then northeastwards to
Brecon and beyond. It consists of both a series of
faults and associated
folds which were active during the mountain-building period known as the
Variscan orogeny. This line of weakness probably featured in the earlier
Caledonian Orogeny and perhaps reflects a more ancient line of weakness in the
basement rocks. It is also known (in part) as the
Tawe Valley Disturbance or the
Swansea Valley Disturbance.