| P number: | P531436 |
|---|---|
| Caption: | Photomicrograph of Charlestown Main (Seafield Tower) Limestone. Light: XPL. Magnification: x2.5. Shore south of Seafield Tower, Kirkcaldy, Fifeshire, Scotland. |
| Description: | A brown, compact, microcrystalline dolomite with crinoid ossicles scattered in the rock. This specimen is Carboniferous Limestone Series in age. BGS sample number SL 280. British Geological Survey Petrology Collection sample number S 35803. Photomicrograph details: Light: XPL, Magnification: x2.5. In thin section the rock is a dolomite of very variable grain, parts being of 0.1 mm grain size and cemented by limonitic clay, most being about 0.2 mm grain size, but large areas show recrystallized dolomite of grain 0.5-1.0 mm across. In this rock there is much more disseminated limonite (or limonitic clay) than in associated limestones, and because of original impurities having impregnated the carbonate of the crinoids, the trabecular structure is extensively preserved in spite of the dolomitization, which may have completely destroyed all other evidence, including shape. The rock shows some reaction with dilute hydrochloric acid, whilst the crinoid remains do not, indicating they have been dolomitized. |
| Date taken: | Sun Jun 25 00:00:00 GMT 1905 |
| Photographer: | Unknown |
| Copyright statement: | Unknown |
| Orientation: | Landscape |
| Size: | 365.54 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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