SN5779 : Twin micro-fold axes below Allt Wen

near to Rhydyfelin, Ceredigion/Sir Ceredigion, Great Britain

Twin micro-fold axes below Allt Wen
Twin micro-fold axes below Allt Wen
Two micro-fold axes surface on the wave-cut platform below the cliff of Allt Wen. A relatively thick band of light grey sediment makes it easy to follow the repeated folding pattern. In the background, yet another fold axis can be seen a little higher up.

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.
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SN5779, 60 images   (more nearby )
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Date Taken
Sunday, 7 March, 2010   (more nearby)
Friday, 12 March, 2010
Geological feature   (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
Southwest (about 225 degrees)
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