File:Jointing in the Sgurr Pitchstone - geograph.org.uk - 905154.jpg
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| Description |
English: Jointing in the Sgurr Pitchstone The steep alignment of columnar jointing and the deeply eroded basalt lava flows beneath An Sgurr indicate that the pitchstone flowed into an existing valley. Although the upper and lower face of the cliff shows a different jointing pattern, it is held that the pitchstone was emplaced in a single flow.
Pitchstone is a term for a dominantly-glassy, quickly-cooled lava that contains a significant proportion of earlier crystals. If it was all-glass it would be called obsidian. |
| Date | |
| Source | From geograph.org.uk |
| Author | Jonathan Wilkins |
| Attribution (required by the license) | Jonathan Wilkins / Jointing in the Sgurr Pitchstone / |
| 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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Licensing
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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 Jonathan Wilkins 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: Jonathan Wilkins
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 19:50, 21 February 2011 | | 480 × 640 (101 KB) | GeographBot (talk | contribs) | == {{int:filedesc}} == {{Information |description={{en|1=Jointing in the Sgurr Pitchstone The steep alignment of columnar jointing and the deeply eroded basalt lava flows beneath An Sgurr indicate that the pitchstone flowed into an existing valley. Althou |
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