| P number: | P528009 |
|---|---|
| Caption: | Photomicrograph of limestone. Light: PPL. Magnification: x2.5. Thorlieshope Limeworks, 400 yards south of Hob Knowe, 4 miles east of Riccarton Junction, Roxburghshire, Scotland. |
| Description: | A grey, fine-grained cavernous limestone, with cavities which in some cases represent shells dissolved away. This specimen is Calciferous Sandstone Series (Carboniferous) in age. BGS sample number SL 200. British Geological Survey Petrology Collection sample number S 35056. Photomicrograph details: Light: PPL, Magnification: x2.5. Small black pellets are numerous in patches. The rock is composed of a large number of large fairly thin-walled shells, which enclose turbid calcite-mudstone in various stages of recrystallization, in a partially recrystallized and dolomitized matrix. The less recrystallized portions show a clotted structure and contain fragments of thin shells. In places the rock contains rolled or angular fragments of shelly calcite-mudstone, shell fragments coated with precipitated calcite and, more rarely, ooliths, together with fragments of hollow structures, perhaps spines. Refractive index tests show that both dolomite and ankerite are present in the sample. |
| Date taken: | Sun Jun 25 00:00:00 GMT 1905 |
| Photographer: | Unknown |
| Copyright statement: | Unknown |
| Orientation: | Landscape |
| Size: | 287.05 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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