| P number: | P528016 |
|---|---|
| Caption: | Photomicrograph of Charlestown Main Limestone, higher dolomitic part. Light: XPL. Magnification: x2.5. North end of West Quarry, Charlestown, 3 miles south-west of Dunfermline, Fifeshire, Scotland. |
| Description: | A buff microcrystalline dolomite with many cavities which are surrounded by iron staining. This specimen is Carboniferous Limestone Series in age. BGS sample number SL 224. British Geological Survey Petrology Collection sample number S 35082. Photomicrograph details: Light: XPL, Magnification: x2.5. The rock is composed of turbid grains, rhomboid and irregular 0.1-0.25 mm across, of dolomite. Diffuse curved outlines of shells and crinoid columnals are preserved as single crystals of dolomite. There are a few small irregular grains of chert and secondary quartz and of composite granular quartz probably of detrital origin. Occasionally a crinoid columnal is considerably replaced by secondary quartz in which trabecular structure may be retained. The well preserved crinoid columnals can be seen in the hand specimen. They do not react with cold dilute acid but usually active effervescence can be seen on their borders or in the canal. No calcite can be distinguished in these positions in the section. |
| Date taken: | Sun Jun 25 00:00:00 GMT 1905 |
| Photographer: | Unknown |
| Copyright statement: | Unknown |
| Orientation: | Landscape |
| Size: | 364.52 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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