File:Folded strata below Allt Wen - geograph.org.uk - 1750035.jpg
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English: Folded strata below Allt Wen Layers of silurian sedimentary rock have been folded up to a vertical orientation on the beach below the cliff of Allt Wen. One of several micro-fold axes can be seen in the background on the right. The rocks are in fact grey; the reddish tinge is caused by a glorious Cardigan Bay sunset.
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 http://www.thegcr.org.uk/Sites/GCR_v03_C04_Site2318.htm . |
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| Source | From geograph.org.uk |
| Author | Rudi Winter |
| Attribution (required by the license) | Rudi Winter / Folded strata below Allt Wen / |
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This image was taken from the Geograph project collection. See this photograph's page on the Geograph website for the photographer's contact details. The copyright on this image is owned by Rudi Winter and is licensed for reuse under the Creative Commons Attribution-ShareAlike 2.0 license.
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This file is licensed under the Creative Commons Attribution-Share Alike 2.0 Generic license.
Attribution: Rudi Winter
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| current | 22:51, 5 March 2011 | | 768 × 1,024 (538 KB) | GeographBot (talk | contribs) | == {{int:filedesc}} == {{Information |description={{en|1=Folded strata below Allt Wen Layers of silurian sedimentary rock have been folded up to a vertical orientation on the beach below the cliff of Allt Wen. One of several micro-fold axes can be seen i |
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