| P number: | P527970 |
|---|---|
| Caption: | Photomicrograph of Castlecary Limestone, upper leaf. Light: PPL. Magnification: x2.5. Black Devon at North Shaw Wood, 1.5 miles west of Saline, Fifeshire, Scotland. |
| Description: | Pale bluish-grey, dull, compact dolomite. This specimen is Carboniferous Limestone Series in age. BGS sample number SL 115. British Geological Survey Petrology Collection sample number S 34588. Photomicrograph details: Light: PPL, Magnification: x2.5. The rock is composed of dolomitized fragments of large shells in a matrix of dolomite-quartz sandstone. The shells show so sharp a difference in coarseness of dolomite recrystallization, 0.2 mm grain size, from that of the matrix 0.04 mm, that they may represent a period of dolomitization prior to their accumulation as detrital grains in the present sediment. Some of the fragments look like dolomite-rock rather than shells. The matrix is composed of granular dolomite without rhomboid shape, small and angular grains of quartz, many streaks of dark material, probably decomposed rock or feldspar, abundant pyrite and some pyritized carbonaceous material. The dolomite is ankeritic. Arenaceous dolomite in which the original elastic and clastizoic structures are preserved, though the internal structure of the fossils has been destroyed. |
| Date taken: | Sun Jun 25 00:00:00 GMT 1905 |
| Photographer: | Unknown |
| Copyright statement: | Unknown |
| Orientation: | Landscape |
| Size: | 412.06 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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