| P number: | P531435 |
|---|---|
| Caption: | Photomicrograph of Charlestown Main Limestone. Light: XPL. Magnification: x2.5. Glenniston Quarry, 1 mile north of Auchtertool, Fifeshire, Scotland. |
| Description: | A compact, fawn-coloured dolomite with crinoid ossicles. This specimen is Carboniferous Limestone Series in age. BGS sample number SL 279. British Geological Survey Petrology Collection sample number S 35802. Photomicrograph details: Light: XPL, Magnification: x2.5. The rock is composed of interlocking grains of dolomite, 0.1-0.2 mm across, amongst which there are single crystal dolomite replacements of crinoid ossicles and coarsely crystalline aggregates after shell casts. There is great variation in the degree of preservation of the original outline of the organic constituents, some ossicles and shell casts being perfect, while others are mere indications. Calcite was not distinguished in the thin section, but must be fairly uniformly present through the rock on the evidence of slight overall effervescence with cold dilute hydrochloric acid. |
| Date taken: | Sun Jun 25 00:00:00 GMT 1905 |
| Photographer: | Unknown |
| Copyright statement: | Unknown |
| Orientation: | Landscape |
| Size: | 385.09 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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