| P number: | P527954 |
|---|---|
| Caption: | Photomicrograph of Index Limestone. Light: PPL. Magnification: x2.5. 300 yards south of High Polquhirter, 1 mile south-east of New Cumnock, Ayrshire, Scotland. |
| Description: | Dull, brownish-grey, fine-grained dolomite. This specimen is Carboniferous Limestone Series in age. BGS sample number SL 95. British Geological Survey Petrology Collection sample number S 34561. Photomicrograph details: Light: PPL, Magnification: x2.5. The rock consists of granular dolomite, about 0.1 mm grain which is turbid with amorphous dust and speckled with opaque brown material, perhaps limonite. The dolomite is ankeritic. The section shows a number of fragmentary fossils which have been recrystallized and filled in with coarse carbonate. Staining of the sample by the silver nitrate-potassium chromate method shows that this carbonate as well as coarse material in cracks is dolomite, calcite being present only as specks distributed abundantly in and throughout the dolomite of the matrix. A small quantity of bitumen is present, mainly along stylolitic films, and also a little pyrite. |
| Date taken: | Sun Jun 25 00:00:00 GMT 1905 |
| Photographer: | Unknown |
| Copyright statement: | Unknown |
| Orientation: | Landscape |
| Size: | 373.50 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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