| P number: | P001079 |
|---|---|
| Old photograph number: | D03531 |
| Caption: | Lion Rock, Great Cumbrae. Buteshire. A Tertiary age tholeiitic andesite dyke of cumbraeite type intruded into Upper Devonian sandstones. The rock is a former sea stack, now preserved on the post-glacial raised beach. |
| Description: | Lion Rock, Great Cumbrae. Buteshire. A Tertiary age tholeiitic andesite dyke of cumbraeite type intruded into Upper Devonian sandstones. The rock is a former sea stack, now preserved on the post-glacial raised beach. The cumbraeite dyke, forming a wall on a 15 feet high raised beach is a porphyritic rock with large yellowish-white phenocrysts of plagioclase feldspar in a black vitreous groundmass. The dyke is sixteen feet wide and can be traced inland for about one mile where it ends abruptly against a major north-south fault. The dyke is part of a major swarm of north-west - south-east trending dykes associated with the intense and prolonged Tertiary volcanism that was spread over eleven million years from 63-52 Ma. In particular, they are associated with the dyke swarm emanating from Mull. |
| Date taken: | 01/07/1983 |
| Photographer: | McTaggart, F.I. |
| Copyright statement: | NERC |
| Acknowledgment: | This image was digitized with grant-in-aid from SCRAN the Scottish Cultural Resources Access Network |
| X longitude/easting: | 217900 |
| Y latitude/northing: | 654900 |
| Coordinate reference system, ESPG code: | 27700 (OSGB 1936 / British National Grid) |
| Orientation: | Landscape |
| Size: | 353.68 KB; 1000 x 789 pixels; 85 x 67 mm (print at 300 DPI); 265 x 209 mm (screen at 96 DPI); |
| Average Rating: | Not yet rated |
| Categories: | Best of BGS Images/ Geological structures |
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