| P number: | P527988 |
|---|---|
| Caption: | Photomicrograph of limestone in Brora Arenaceous Series. Light: PPL. Magnification: x10. Ardassie Point, Brora, Sutherland, Scotland. |
| Description: | A dull, dark grey compact limestone. This specimen is Jurassic in age. BGS sample number SL 161. British Geological Survey Petrology Collection sample number S 34848. Photomicrograph details: Light: PPL, Magnification: x10. The sample is composed of a base of intermingled clear, finely granular calcite and pelitomorphic calcite in which are set angular grains of quartz, irregular granular groups of pyrite, splinters of coaly matter, accessory muscovite, biotite and siliceous pebbles, and a few 'galls' of calcareous grit. Echinodermal and shell fragments are present and small spherical bodies are very numerous. The spherical bodies range in diameter from 0.05 to 0.12 mm. Many present smooth, continuous surfaces to the matrix and some appear to possess a thin peripheral shell. Many however present no definite boundary to the matrix and the carbonate sectors of which they are composed project to different amounts into the matrix. The nature of these bodies is uncertain; they resemble 'sporangites' described in Devonian black shales. |
| Date taken: | Sun Jun 25 00:00:00 GMT 1905 |
| Photographer: | Unknown |
| Copyright statement: | Unknown |
| Orientation: | Landscape |
| Size: | 324.34 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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