SN5779 : Folded strata below Allt Wen

near to Rhydyfelin, Ceredigion/Sir Ceredigion, Great Britain

Folded strata below Allt Wen
Folded strata below Allt Wen
This close-up shows a cross section of the folded strata exposed on the wave-cut platform below the cliffs of Allt Wen. The dark gray material is grainier and more brittle than the light grey sediment it alternates with. The width of the pictured area is about 25cm.

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 .
Creative Commons Licence [Some Rights Reserved]   © Copyright Rudi Winter and licensed for reuse under this Creative Commons Licence.
year taken
2010
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SN5779, 58 images   (more nearby)
Photographer
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Image classification?
Supplemental image
Date Taken
Sunday, 7 March, 2010   (more nearby)
Submitted
Friday, 12 March, 2010
Geographical Context
Geological interest  Rocks, Scree, Cliffs 
Primary Subject of Photo
Rock 
Category
Rock strata   (more nearby)
Subject Location
OSGB36: geotagged! SN 575 794 [100m precision]
WGS84: 52:23.6411N 4:5.7389W
Photographer Location
OSGB36: geotagged! SN 575 794
View Direction
Northeast (about 45 degrees)
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