The Carreg Cennen Disturbance is a zone of geological faults and

folds Benjamin Scott Folds (born September 12, 1966) is an American singer-songwriter, musician, and composer, who is the first artistic advisor to the National Symphony Orchestra at the John F. Kennedy Center for the Performing Arts, Kennedy Center in ...

in south and mid Wales which forms a part of both the Church Stretton Fault Zone and the Welsh Borderland Fault System. To the southwest it is known as the 'Llandyfaelog Disturbance'. These structures which stretch from

Pembrokeshire Pembrokeshire ( ; cy, Sir Benfro ) is a Local government in Wales#Principal areas, county in the South West Wales, south-west of Wales. It is bordered by Carmarthenshire to the east, Ceredigion to the northeast, and the rest by sea. The count ...

to Shropshire are thought to have originated during the Caledonian Orogeny or mountain-building period.

Influence on the landscape

It is most impressively revealed at Carreg Cennenhttps://www.geograph.org.uk/search.php?i=4967683 images of Carreg Cennen on Geograph website itself where the

mediaeval In the history of Europe, the Middle Ages or medieval period lasted approximately from the late 5th to the late 15th centuries, similar to the post-classical period of global history. It began with the fall of the Western Roman Empire a ...

castle sits perched atop a 90m cliff of Carboniferous Limestone which is caught up within a faulted block sitting between two arms of the Disturbance. It is probably also responsible for the alignment of the

Afon Cennen The Afon Cennen is a river in the county of Carmarthenshire, south Wales. It rises on the northern slopes of the Black Mountain to the east of the summit of Tair Carn Uchaf and flows north to Blaencennen Farm, then westwards past Carreg Cennen ...

to the west of this location where the river follows the line of the fault for over 2.5 mi / 4 km.

The Caledonian Orogeny

The Carreg Cennen Disturbance is one of the more southerly geological features within Britain which can be described as following the Caledonoid trend. The phrase describes a suite of major northeast-southwest oriented geological structures associated with the closure of the former

Iapetus Ocean The Iapetus Ocean (; ) was an ocean that existed in the late Neoproterozoic and early Paleozoic eras of the geologic timescale (between 600 and 400 million years ago). The Iapetus Ocean was situated in the southern hemisphere, between the paleoco ...

in the middle Palaeozoic era and giving rise to the Caledonian Orogeny. The Neath Disturbance and the Cribarth Disturbance are similar features also found in south Wales. The

Bala Fault The Bala Fault is a SW-NE trending geological fault in Wales that extends offshore into Cardigan Bay. In the offshore area it is a major normal fault and forms the bounding structure to the Cardigan Bay Basin, with a fill including about of Lias ...

Menai Strait Fault Menai may refer to the following places: Australia *Menai, New South Wales Africa *Menai Bay on the island of Zanzibar, Tanzania *Menai Island, a Cosmoledo atoll islet, Seychelles Europe *Menai, an electoral ward in Bangor, Wales, UK *Menai (Caern ...

, Southern Uplands Fault, Highland Boundary Fault and

Great Glen Fault The Great Glen Fault is a strike-slip fault that runs through the Great Glen in Scotland. The fault is mostly inactive today, but occasional moderate tremors have been recorded over the past 150 years. Location Aligned northeast to southwest, t ...

are other major Caledonoid structures of Britain.

References

{{reflist Geology of Wales

Influence on the landscape

The Caledonian Orogeny

See also

References