| P number: | P524252 |
|---|---|
| Caption: | Photomicrograph of grit. Light: XPL, Magnification x 2. West of Round Hill, south-west of Penpoint, near Thornhill, Dumfriesshire. |
| Description: | The image is a photomicrograph of a grit taken using crossed polarizing lenses in order to discriminate between the different components present. The rock is a mixture of several mineral types including quartz, feldspar, mica, iron oxide and broken-down rock fragments or 'lithics'. British Geological Survey Petrology Collection sample number S 94029. Light: XPL, Magnification x 2. Light: XPL, Magnification x 2. Mica is easily distinguished from the other components by having a brighter birefringence colour. This grit, found to the west of Round Hill, is part of the Gala Group, a series of Silurian coarse-grained greywackes, grits, flags, shales and conglomerates. The Gala Group is divided into three lithological formations, the Hawick Rocks, Queensbury Grits and the Abbotsford Flags. A graptolite fauna indicates an Upper Llandovery (Silurian) age. |
| Date taken: | Wed Jan 01 00:00:00 GMT 2003 |
| Photographer: | Hyslop, E.K. |
| Copyright statement: | NERC |
| X longitude/easting: | 283150 |
| Y latitude/northing: | 593170 |
| Coordinate reference system, ESPG code: | 27700 (OSGB 1936 / British National Grid) |
| Orientation: | Landscape |
| Size: | 291.61 KB; 1000 x 667 pixels; 85 x 56 mm (print at 300 DPI); 265 x 176 mm (screen at 96 DPI); |
| Average Rating: | Not yet rated |
| Categories: | Unsorted Images |
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