The Ceibwr Bay Fault is a WSW-ENE trending

fault zone In geology, a fault is a planar fracture or discontinuity in a volume of rock across which there has been significant displacement as a result of rock-mass movements. Large faults within Earth's crust result from the action of plate tectonic ...

that cuts

Ordovician The Ordovician ( ) is a geologic period and System (geology), system, the second of six periods of the Paleozoic Era (geology), Era. The Ordovician spans 41.6 million years from the end of the Cambrian Period million years ago (Mya) to the start ...

rocks of the

Ashgill Ashgill is a village in South Lanarkshire, Scotland near Larkhall. It is part of the Dalserf parish. The village church dates back to 1889 The village has a shop The local school was first in Scotland to have an automated bell, installed in 1 ...

Nantmel Mudstones Formation and the

Caradoc Caradoc Vreichvras (; Modern cy, Caradog Freichfras, ) was a semi-legendary ancestor to the kings of Gwent. He may have lived during the 5th or 6th century. He is remembered in the Matter of Britain as a Knight of the Round Table, under the na ...

Dinas Island Formation. The fault is exposed on the south side of

Cardigan Bay Cardigan Bay ( cy, Bae Ceredigion) is a large inlet of the Irish Sea, indenting the west coast of Wales between Bardsey Island, Gwynedd in the north, and Strumble Head, Pembrokeshire at its southern end. It is the largest bay in Wales. Geograp ...

Wales Wales ( cy, Cymru ) is a Countries of the United Kingdom, country that is part of the United Kingdom. It is bordered by England to the Wales–England border, east, the Irish Sea to the north and west, the Celtic Sea to the south west and the ...

and forms part of the Fishguard-Cardigan Fault Zone. It extends from the coast at

Ceibwr Bay Ceibwr Bay ( cy, Bae Ceibwr) is a bay opening into the Irish Sea in Pembrokeshire, west Wales. It is about 7 km west of Cardigan, and 3 km south of the headland of Cemaes Head. It is owned by the National Trust, within the Pembrokeshire ...

at its western end to the coast at

Aberporth Aberporth is a seaside village, community and electoral ward in Ceredigion, Wales. The population at the 2001 Census, was 2,485, of whom 49 per cent could speak the Welsh language. At the 2011 Census, the population of the community was 2,374 a ...

at its eastern end. The fault zone is thought to have been active as a normal fault throughout the deposition of the Ordovician sequence.

References

Geology of Wales Cardigan Bay {{Wales-geo-stub

See also

References