SN5779 : Wave-cut platform below Allt Wen

taken 11 years ago, near to Penparcau, Ceredigion/Sir Ceredigion, Great Britain

Wave-cut platform below Allt Wen
Wave-cut platform below Allt Wen
This view along the wave-cut platform shows the vertical alignment of the strata. The rock in the foreground shows how the strata are bent due to the presence of nearby fold axes. Aberystwyth with its castle, South Beach and harbour can be seen in the background.

Allt Wen, the northern end of the coastal cliff south of Aberystwyth, is a remarkable geological site. A number of 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 (Archive LinkExternal link ) .
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SN5779, 77 images   (more nearby search)
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Date Taken
Sunday, 7 March, 2010   (more nearby)
Saturday, 13 March, 2010
Geographical Context
Geological interest  Rocks, Scree, Cliffs 
Primary Subject of Photo
Rock strata   (more nearby)
Subject Location
OSGB36: geotagged! SN 576 797 [100m precision]
WGS84: 52:23.8044N 4:5.6585W
Camera Location
OSGB36: geotagged! SN 575 795
View Direction
North-northeast (about 22 degrees)
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Image classification(about): Geograph
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