| P number: | P528021 |
|---|---|
| Caption: | Photomicrograph of Charlestown Main Limestone (?). Light: PPL. Magnification: x2.5. St. Monans shore east of harbour, Fifeshire, Scotland. |
| Description: | A dull grey dolomite containing crinoid ossicles. This specimen is Carboniferous Limestone Series in age. BGS sample number SL 234. British Geological Survey Petrology Collection sample number S 35237. Photomicrograph details: Light: PPL, Magnification: x2.5. The thin section shows large crinoid columnals and shell fragments, the structure of which is destroyed by recrystallization, in a ground of dolomite, of grain size 0.02-0.1 mm, coloured brown by disseminated bituminous clay. Stylolitic films separate bands of debris of differing grain size. There are a few small brown isotropic phosphatic fossil fragments. The crinoid columnals are preserved in dolomite though generally retaining their single crystal structure and enclosing small rhombs of dolomite. The crinoid ossicles in this rock do not effervesce in cold dilute HCl, but a slight overall effervescence in the rock shows the dissemination of calcite. The dolomite is ferriferous, the ordinary refractive index being 1.695. |
| Date taken: | Sun Jun 25 00:00:00 GMT 1905 |
| Photographer: | Unknown |
| Copyright statement: | Unknown |
| Orientation: | Landscape |
| Size: | 323.20 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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