NM3798 : Lewisian Gneiss

taken 6 years ago, 3 km from Kinloch, Highland, Great Britain

Lewisian Gneiss
Lewisian Gneiss
The gneissose texture can be seen here where 'light' and 'dark' (leucocratic and melanocratic) can be seen. The darker layers are full of amphibolitic minerals and the lighter pull of plagioclase. These rocks are heavily deformed and are craton material (ancient crust) in fact they are the oldest in the UK being nearly 3 billion years old, and that was a deformation date. They started out as barren granites or sediments before being taken down over 40km, twisted, intruded and eventually eroded. This was before torridonian sediments were deposited on an eroded landscape, the unconformity (Franciss gritty sandstone) can be seen near this locality.
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NM3798, 6 images   (more nearby )
Contributed by
Ashley Dace   (find more nearby)
Date Taken
Wednesday, 13 June, 2012   (more nearby)
Thursday, 21 June, 2012
Geographical Context
Geological interest 
Subject Location
OSGB36: geotagged! NM 371 988 [100m precision]
WGS84: 57:0.3524N 6:19.8951W
Camera Location
OSGB36: geotagged! NM 370 988
View Direction
Northeast (about 45 degrees)
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