| P number: | P521334 |
|---|---|
| Caption: | Rock specimen of fine grained sandstone. Shore, south-east of Dunbar, Haddingtonshire, Scotland. |
| Description: | The sample is a fine-grained 'red' sandstone, typical of many of the Devonian Old Red Sandstones of Scotland. It is composed predominantly of grains of quartz, with subordinate feldspar and flakes of white mica. The mica is typically aligned along the bedding planes, producing a reflective shimmer to these surfaces. The rock is thinly bedded and rather laminated, although this is not shown in the photograph which looks directly onto a bedding surface. British Geological Survey Petrology Collection sample number EMC2448. Sandstones are classified as arenaceous rocks, and are often described in terms of their grain size. In general, sandstones are described as Very Fine (0.125 to 0.062 mm.), Fine (0.25 to 0.125 mm.), Medium (0.5 to 0.25 mm.), Coarse (1 to 0.5 mm.) and Very Coarse (2 to 1 mm.). Other ways of describing sandstones are by their sorting characteristics, particles shape, mineralogy and matrix cement. The Upper Devonian rocks in the southern part of the Midland Valley extend from Dunbar and the Pentland Hills to Ayrshire. The predominant lithology is sandstone, red or pink in colour, and less commonly purplish, yellow or white. The Devonian rocks were laid down in an internal basin within a large continent. The basin lay between the mountains of the Caledonian Orogeny in the north and the newly formed Southern Uplands in the south. |
| Date taken: | Sun Dec 01 00:00:00 GMT 2002 |
| Photographer: | McTaggart, F.I. |
| Associate: | T.S. Bain |
| Copyright statement: | NERC |
| Additional information: | EMC2448 |
| Orientation: | Landscape |
| Size: | 234.97 KB; 1000 x 702 pixels; 85 x 59 mm (print at 300 DPI); 265 x 186 mm (screen at 96 DPI); |
| Average Rating: | Not yet rated |
| Categories: | Best of BGS Images/ Geological structures |
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