File:The Double Unconformity - geograph.org.uk - 823319.jpg
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English: The Double Unconformity On Beinn Gharbh there is a double unconformity. An unconformity is a gap in time between two layers of rock which lie one directly on top of the other. The lower part of the mountain is formed of hummocky Lewisian gneiss up to 2700 million years old. Above this there are horizontal ledges of Torridonian sandstone, laid down between 1200 million and 700 million years ago. Finally, the slope on the east (left) is of Cambrian Quartzite, laid down some 200 million years later still. In this last gap in time, parts of the sandstone were eroded away, so that the quartzite on the upper part of the mountain lies on top of the sandstone, but on the eastern end of the ridge the quartzite lies directly on the gneiss, with no sandstone in between. |
| Date | |
| Source | From geograph.org.uk |
| Author | Anne Burgess |
| Attribution (required by the license) | Anne Burgess / The Double Unconformity / |
| Camera location |   | View this and other nearby images on: OpenStreetMap |  |
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| Object location | | View this and other nearby images on: OpenStreetMap | |
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This image was taken from the Geograph project collection. See this photograph's page on the Geograph website for the photographer's contact details. The copyright on this image is owned by Anne Burgess and is licensed for reuse under the Creative Commons Attribution-ShareAlike 2.0 license.
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This file is licensed under the Creative Commons Attribution-Share Alike 2.0 Generic license.
Attribution: Anne Burgess
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 17:09, 20 February 2011 | | 640 × 427 (260 KB) | GeographBot (talk | contribs) | == {{int:filedesc}} == {{Information |description={{en|1=The Double Unconformity On Beinn Gharbh there is a double unconformity. An unconformity is a gap in time between two layers of rock which lie one directly on top of the other. The lower part of the |
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