SN5779 : Wave-cut platform below Allt Wen

taken 9 years ago, near to Rhydyfelin, Ceredigion/Sir Ceredigion, Great Britain

Wave-cut platform below Allt Wen
Wave-cut platform below Allt Wen
Alternating hard and soft layers have been folded up vertically and eroded by the tides, resulting in a regular ripple pattern at the surface.

Allt Wen, the northern end of the coastal cliff south of Aberystwyth, is a remarkable geological site. A number of micro-folds only a few metres across with nearly parallel vertical limbs have been exposed on a wave-cut platform at the base of the cliff. The exact sequence of events that have taken place here is still debated, but it is thought that during the Caledonian orogeny 400Ma ago, freshly deposited layers of sediment became pressurised and folded before they were fully lithified and thus more deformable. There are also quartz veins parallel with the bedding in some places. It is thought that they were pressed into the fresh sediment before the folding took place. For more details, see the Geological Conservation Review's site report LinkExternal link .
Geological Conservation Review
The Geological Conservation Review (GCR) is a database of geological reference sites in Great Britain. It is published by the Joint Nature Conservation Committee (JNCC) in the form of site reports collected in printed volumes covering different geological periods and topical areas such as fossils, minerals or geomorphology. The site reports are gradually put online in a searchable database LinkExternal link .
Allt Wen GCR site
Allt Wen, the northern end of the coastal cliff south of Aberystwyth, is a remarkable geological site. A number of small folds only a few metres across with nearly parallel vertical limbs have been exposed on a wave-cut platform at the base of the cliff. The exact sequence of events that have taken place here is still debated, but it is thought that during the Caledonian orogeny 400Ma ago, freshly deposited layers of sediment became pressurised and folded before they were fully lithified and thus more deformable. There are also quartz veins parallel with the bedding in some places. It is thought that they were pressed into the fresh sediment before the folding took place. For more details, see the Geological Conservation Review's site report LinkExternal link .
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SN5779, 77 images   (more nearby )
Photographer
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Date Taken
Sunday, 7 March, 2010   (more nearby)
Submitted
Friday, 12 March, 2010
Geographical Context
Coastal  Geological interest 
Primary Subject of Photo
Rock 
Category
Wave-cut platform   (more nearby)
Subject Location
OSGB36: geotagged! SN 575 794 [100m precision]
WGS84: 52:23.6411N 4:5.7389W
Camera Location
OSGB36: geotagged! SN 575 794
View Direction
North-northwest (about 337 degrees)
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