| P number: | P528032 |
|---|---|
| Caption: | Photomicrograph of Lower Lias limestone. Light: PPL. Magnification: x2.5. Western outcrop of limestone in Allt Eas Mhor, Sconser, Skye, Invernessshire, Scotland. |
| Description: | A dark grey limestone with large shall fragments and a brecciated appearance in parts and veined by calcite. This specimen is Jurassic in age. BGS sample number SL 242. British Geological Survey Petrology Collection sample number S 35342. Photomicrograph details: Light: PPL, Magnification: x2.5. In thin section the rock is seen to be essentially a dark calcite-mudstone of very fine grainsize, about 0.003 mm. It contains fragments of shells of very varying size. The largest show detailed internal structures, whilst the smallest are down to embryo forms. The shells are considerably recrystallized, but the original fibrous structure is indicated by streaks of dust. Patches of coarsely recrystallized clear calcite represent in most cases fragments of large thick shells. In summary, the sample is a highly fossiliferous limestone with a very fine-grained mud-rich matrix. |
| Date taken: | Sun Jun 25 00:00:00 GMT 1905 |
| Photographer: | Unknown |
| Copyright statement: | Unknown |
| Orientation: | Landscape |
| Size: | 255.78 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: | Best of BGS Images/ Rocks and minerals under the microscope |
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