| P number: | P531451 |
|---|---|
| Caption: | Photomicrograph of Gilmerton (No. 1) Limestone. Light: PPL. Magnification: x2.5. Whitfield Limeworks, 600 yards north-west of Deepsdykehead, 1 mile south-east of Carlops, Peeblesshire, Scotland |
| Description: | The sample is a grey to dark grey compact limestone. This specimen is Carboniferous Limestone Series in age. BGS Sample Number SL 183. British Geological Survey Petrology Collection sample number S 40472. In thin section it is seen to be composed of round and angular grains of very fine-grained calcite, 0.02-0.05 mm across, with a cement of calcite and clay. Fragments of shell are common, with scattered small crinoid columnals and rare fragments of phosphate. Small angular quartz grains, granules of pyrite and drops of opaque bitumen are present. In summary the sample is a very fine-grained muddy limestone composed of granules of clear calcite in a matrix of calcite and clay. The granular calcite is in part recognizable as fossil debris and includes tiny algal growths. |
| Date taken: | Sun Jun 25 00:00:00 GMT 1905 |
| Photographer: | Unknown |
| Copyright statement: | Unknown |
| Orientation: | Landscape |
| Size: | 446.98 KB; 1000 x 663 pixels; 85 x 56 mm (print at 300 DPI); 265 x 175 mm (screen at 96 DPI); |
| Average Rating: | Not yet rated |
| Categories: | Unsorted Images |
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