SH7704 : Bedding and cleavage

taken 9 years ago, near to Llanwrin, Powys, Great Britain

Bedding and cleavage
Bedding and cleavage
The rocks in the hills north of the Afon Dyfi belong to the Llandovery group, the oldest part of the Silurian period. The section shown here, which is about 4m high and part of a small rockface by the side of the steep track into Esgaireira forest, appears to be metamorphic rock. The rock splits into thin, almost vertical layers, while wider coloured bands can be seen at an angle of about 30 degrees with the vertical. This occurs when sedimentary rock containing small orientated crystals is folded under pressure. The crystals align perpendicular to the applied stress, resulting in cleavage planes between them. The original bedding, i.e. the pre-metamorphic sedimentary layers, remain identifiable as bands intersecting the cleavage planes.
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SH7704, 14 images   (more nearby )
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Date Taken
Sunday, 29 March, 2009   (more nearby)
Saturday, 4 April, 2009
Geographical Context
Geological interest  Rocks, Scree, Cliffs 
Primary Subject of Photo
Rock strata   (more nearby)
Subject Location
OSGB36: geotagged! SH 7738 0440 [10m precision]
WGS84: 52:37.4083N 3:48.7728W
Camera Location
OSGB36: geotagged! SH 7738 0440
View Direction
South-southwest (about 202 degrees)
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Other Tags
Rock Strata 

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Image classification(about): Supplemental image
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