Uploaded on:
17/03/2009 04:23:30
Type:
Digital Asset
File Size:
304.15 KB
Dimensions:
1000 x 665 pixels
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P number: P527879
Caption: Ballachulish Limestone from a quarry at Tom an Aoil, Spean Bridge, Invernessshire.
Description: A grey, crystalline limestone belonging to the Dalradian Supergroup (Precambrian) and from a quarry 300 yards north-north-west of Tom an Aoil, and one and three-quarters of a mile east-north-east of Spean Bridge, Invernessshire. British Geological Survey Petrology Collection sample number MC 7655. The limestone is composed of a mosaic of equidimensional grains of closely twinned calcite, 0.4-1-0 mm. across, between which small idioblastic quartz grains, about 0.1 mm across, are scattered. The bedding of the limestone is vertical and strikes north-north-east to north-east. The thickness of the band of high-quality limestone was at least 25 to 30 feet in the quarry, which was nowhere more than 15 feet deep.
Date taken: 25/06/1905
Photographer: Unknown
Copyright statement: Unknown
Orientation: Landscape
Size: 304.15 KB; 1000 x 665 pixels; 85 x 56 mm (print at 300 DPI); 265 x 176 mm (screen at 96 DPI);
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