| P number: | P527960 |
|---|---|
| Caption: | Photomicrograph of Tayvallich Limestone. Light: PPL. Magnification: x2.5. Quarry 270 yards south-east of Baluachraig, one and a quarter miles south by west of Kilmartin, Argyllshire, Scotland |
| Description: | Dark grey, moderately crystalline limestone, containing numerous pebbles of vitreous quartz, pink feldspar and dark red material. This specimen is Dalradian Supergroup (Precambrian) in age. BGS Sample Number SL 125. British Geological Survey Petrology Collection sample number S 34573. In section, irregular areas of brownish oolite are seen to pass into a mosaic of clearer recrystallized calcite. Grains and aggregates of quartz and rounded crystals of microcline reaching 3.0 mm in length are numerous. The dark red pebbles appear to be microcline with much haematitic impregnation. The quartz probably originated as pebble grains, but shows considerable recrystallization. A limestone in which original oolitic structure is preserved in small regions within fully recrystallized rock. |
| Date taken: | 25/06/1905 |
| Photographer: | Unknown |
| Copyright statement: | Unknown |
| Orientation: | Landscape |
| Size: | 344.35 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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