| P number: | P521479 |
|---|---|
| Caption: | Rock specimen of crystalline limestone. Near Kidston, Hamilton Hill, Peebles, Peebles. |
| Description: | The sample is a striking pale-coloured coarsely crystalline limestone containing large white patches of clear calcite and darker areas of micritic carbonate. British Geological Survey Petrology Collection sample number EMC 3390. Most limestones are made of the mineral calcite, a simple compound of calcium and carbonate. Dolomite, which is a calcium-magnesium carbonate is also common. The term micrite is used to describe a limestone which is microcrystalline with a grainsize generally less than 0.01 mm. This specimen of crystalline limestone from near Kidston, Hamilton Hill, near Peebles belongs to the Shinnel Formation, Tweedale Member, Leadhills Group and is of Ashgill age (Ordovician). The formation consists of olistoliths of limestone and extrusive igneous rocks within sandstones and siltstones. During the Ordovician and into the Silurian, the great mountain belt to the north formed during the earlier Grampian Orogeny shed detritus southwards towards the Midland Valley and the Southern Uplands great Iapetus Ocean was slowly closing. |
| Date taken: | Wed Jan 01 00:00:00 GMT 2003 |
| Photographer: | Unknown |
| Copyright statement: | NERC |
| Orientation: | Landscape |
| Size: | 256.27 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: | Unsorted Images |
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