| P number: | P527981 |
|---|---|
| Caption: | Photomicrograph of Craighead (Stinchar) Limestone. Light: PPL. Magnification: x2.5. Craighead Limeworks, 1.5 miles north-north-east of Old Dailly and 3.5 miles north-east of Girvan, Ayrshire, Scotland. |
| Description: | Compact limestone, pale green in colour with white mottles. This specimen is Ordovician in age. BGS sample number SL 152. British Geological Survey Petrology Collection sample number S 34654. Photomicrograph details: Light: PPL, Magnification: x2.5. Large algal growths, in finely granular clear calcite, are embedded in a turbid, very fine textured aggregate of calcite granules probably with clay admixture and in places cemented by Girvanella fossils. In this base groundmass the main fossils are echinodermal and polyzoan fragments and a few thin-walled shells. The groundmass base has a patchy appearance suggesting the break-up of a clean limestone followed by packing of more muddy limestone round the fragments. A few tiny quartz grains are scattered in the turbid limestone. The rock is traversed by calcite-filled cracks. |
| Date taken: | Sun Jun 25 00:00:00 GMT 1905 |
| Photographer: | Unknown |
| Copyright statement: | Unknown |
| Orientation: | Landscape |
| Size: | 339.22 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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