2022

NF7202 : Lewisian gneiss outcrop

taken 2 years ago, near to Bruernish, Barra, Na h-Eileanan an Iar, Scotland

Lewisian gneiss outcrop
Lewisian gneiss outcrop
The Lewisian Gneiss, exposed in extensive glaciated outcrops at this location (see NF7202 : Glaciated rock pavement) shows remarkable banded structure or foliation. This originates where the early-formed, pale granitic rock has been intruded by dark basaltic material and the composite then deformed in a more or less plastic state. Shearing has caused dark material to be stretched out in thin bands (top left) or thicker, more brittle blocks which have started to detach from each other. The last record is of transverse fractures which have been filled with new, quartz-rich mineralisation. This view is around 45 cms wide.

Creative Commons Licence [Some Rights Reserved]   © Copyright Jonathan Wilkins and licensed for reuse under this Creative Commons Licence.
Geographical Context: Geological interest Rocks, Scree, Cliffs Primary Subject: Geological Feature
This photo is linked from: Automatic Clusters: · Rock Outcrop [3] Other Photos: · Glaciated rock pavement ·
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1:50,000 Modern Day Landranger(TM) Map © Crown Copyright
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NF7202, 20 images   (more nearby 🔍)
Photographer
Jonathan Wilkins   (more nearby)
Date Taken
Friday, 13 May, 2022   (more nearby)
Submitted
Sunday, 12 June, 2022
Subject Location
OSGB36: geotagged! NF 7226 0250 [10m precision]
WGS84: 56:59.8157N 7:23.9618W
Camera Location
OSGB36: geotagged! NF 7226 0250
View Direction
NORTH (about 0 degrees)
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Image Type (about): close look 
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