| P number: | P521506 |
|---|---|
| Caption: | Rock specimen of altered sandstone. Corrygills shore, east-south-east of Brodick, Arran, Buteshire. |
| Description: | The sample is a sandstone with a very unusual 'honeycomb' weathering texture, with a series of irregular large cavities surrounded by prominent upstanding margins. British Geological Survey Petrology Collection sample number EMC 2016. The sandstone was sampled from the contact with an igneous dyke, suggesting that the peculiar texture may be the result of alteration perhaps by hydrothermal fluids at the time of dyke emplacement. Large numbers of dolerite and other dykes form swarms crossing the central igneous complex of Arran and the surrounding rocks. On Arran there are 525 dykes with an average thickness of 11.5 feet and a total aggregate thickness of dykes of 6050 feet. This represents a large amount of crustal stretching. The dykes intruded as molten rock would have baked the surrounding country rock as well as chilling the edge of the dyke. The dykes are of Tertiary age. |
| Date taken: | Wed Jan 01 00:00:00 GMT 2003 |
| Photographer: | Unknown |
| Copyright statement: | NERC |
| Orientation: | Landscape |
| Size: | 218.42 KB; 1000 x 775 pixels; 85 x 66 mm (print at 300 DPI); 265 x 205 mm (screen at 96 DPI); |
| Average Rating: | Not yet rated |
| Categories: | Best of BGS Images/ Geological structures |
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