| P number: | P531434 |
|---|---|
| Caption: | Photomicrograph of Charlestown Main Limestone. Light: PPL. Magnification: x2.5. Bogie Mains Quarry, 1 mile north-west of Kirkcaldy station, Fifeshire, Scotland. |
| Description: | Dark grey bedded dolomitic chert, with white angular specks, showing an undulating lamination. This specimen is Carboniferous Limestone Series in age. BGS sample number SL 277. British Geological Survey Petrology Collection sample number S 35800. Photomicrograph details: Light: PPL, Magnification: x2.5. In thin section the rock consists of a matrix of fine-grained silica and obscure opaque material, in which are embedded numerous bodies of round, rectangular or less regular shapes, sometimes showing relics of shell structure. These may be composed entirely of cherty silica, of silica and prochlorite, silica and dolomite, or of all three; or they may be entirely of chlorite or of dolomite. Only in one large dolomite-silica fragment was the trabecular structure of a crinoid recognized. The chlorite is pleochroic from yellow to colourless. The rock appears to be a silicified shale, originally calcareous and rich in fossil debris. The large amount of chlorite suggests that pyroclastic material formed part of the original sediment. The silica available for silicification may also have been of volcanic origin. |
| Date taken: | Sun Jun 25 00:00:00 GMT 1905 |
| Photographer: | Unknown |
| Copyright statement: | Unknown |
| Orientation: | Landscape |
| Size: | 350.21 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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