| P number: | P521236 |
|---|---|
| Caption: | Rock specimen of marble. Balvraid, Gleann Beag, Glenelg, Invernessshire, Scotland. |
| Description: | The photograph is a detail of the sample surface which has been cut and polished in order to show the presence of a complex deformed and folded dark layer, within a pale-coloured crystalline marble. The dark layer may represent a thin bed of mudstone which has been deposited into a carbonate (limestone) sequence. Once the strata have been deeply buried, earth movements have resulted in deformation and the different composition of the thin layer from the rest of the rock has allowed it to become much more deformed. British Geological Survey Petrology Collection sample number EMC468. Marble is a metamorphosed limestone, produced by recrystallization under conditions of high temperature and pressure. It is the impurities in the original limestone that react to produce their attractive appearance, making them valued as decorative stones. The geology of Glenelg is very complex, containing a crucial contact between the Lewisian basement rocks and the overlying Moine metasedimentary sequence. It is acknowledged as very significant to the understanding of the early geological evolution of Scotland. |
| Date taken: | Sun Dec 01 00:00:00 GMT 2002 |
| Photographer: | McTaggart, F.I. |
| Associate: | T.S. Bain |
| Copyright statement: | NERC |
| Additional information: | EMC468 |
| Orientation: | Landscape |
| Size: | 214.90 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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