Uploaded on:
16/03/2009 11:07:42
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285.26 KB
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P number: P527724
Caption: Diatomite from Toombridge, Bann Valley, Northern Ireland.
Description: A specimen of diatomite from Toombridge, Bann Valley, Northern Ireland. The diatomaceous earth deposits of the Bann Valley have been known and exploited for many years and have been used by many British manufacturers. British Geological Survey Petrology Collection sample number MC 7501. The deposits occur in the counties of Antrim and Londonderry on both banks of the River Bann to the north of Lough Neagh. They were deposited in former glacially-formed lakes that have now been artificially drained. The principal workings are in Toombridge, but other beds of diatomaceous earth have been worked at Glassgort, eight miles north of Coleraine and between Portglenone and Portna. The diatomite is found in beds up to six feet thick under a thin covering of peat. In quality and content of impurities it varies considerably. Most of the production was sold for the manufacturing of insulating bricks.
Date taken: 25/06/1905
Photographer: Unknown
Copyright statement: Unknown
Orientation: Landscape
Size: 285.26 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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