| P number: | P527930 |
|---|---|
| Caption: | Photomicrograph of Kirkby's IIIa Limestone. Light: PPL. Magnification: x2.5. Shore at Randerston, Fifeshire, Scotland. |
| Description: | The limestone is a banded grey and buff close-grained dolomite with flinty fracture. This specimen is Calciferous Sandstone Series (Carboniferous) in age. BGS sample number SL 28. British Geological Survey Petrology Collection sample number S 34450. Photomicrograph details: Light: PPL, Magnification: x2.5. The sample is composed of finely granular dolomite of 0.02-0.03 mm grain size, the refractive index of which is 1.697 or slightly greater, indicating a content of about 20 per cent ferrodolomite. The rock contains numerous thin tests of ostracods many of which are preserved in black material which is probably pyrite. Granules and tiny cubes of oxidized pyrite are scattered through the rock. Yellow phosphatic fossil fragments are very scarce. In summary, a ferriferous dolomite in which the grain varying from microcrystalline to pelitomorphic probably reflects the variation of grain in the original limestone. Shells of ostracods are delineated by more and less dense concentrations of pyrite powder through which the more coarsely crystalline dolomite within the shells grows. |
| Date taken: | Sun Jun 25 00:00:00 GMT 1905 |
| Photographer: | Unknown |
| Copyright statement: | Unknown |
| Orientation: | Landscape |
| Size: | 311.24 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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