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P001079

Uploaded on:
13/02/2009 10:19:12
Type:
Digital Asset
File Size:
353.68 KB
Dimensions:
1000 x 789 pixels
5010 views 4 downloads
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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