- GeoRef, Copyright 2004, American Geological Institute. Reference includes data from Bibliography and Index of Geology Exclusive of North America, Geological Society of America, Boulder, CO, United States
Some 23 faults with an offset of more than 30 feet, cutting sharply across the strike of the beds, and exhibiting either a dextral or a sinistral pattern have been mapped in the Ludlovian (Silurian)-Downtonian (Devonian) rocks of the Llandeilo area, Wales. They are described as rotational strike-slip faults. Their form resembles that of fractures that have been attributed to the Armorican stress system.