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P524410


P number: P524410
Caption: Photomicrograph of garnet-mica schist. Light: PPL, Magnification x 2. Glen Roy half a mile north-east of Stone and east of Beinn a' Monicag, Invernessshire.
Description: The image is a photomicrograph of a thin section of garnet-mica schist, showing large dark crystals of garnet within a lighter-coloured matrix of muscovite, quartz and feldspar. British Geological Survey Petrology Collection sample number S 82420. Light: PPL, Magnification x 2. Light: PPL, Magnification x 2. The large subspherical crystals in the image are garnet porphyroblasts. They can be easily identified from their high relief in thin section and the presence of distinctive internal fractures and inclusions. This specimen is from Glen Roy, half a mile north-east of Stone and belongs to the Leven Schist Formation, Appin Group, Dalradian Supergroup (Precambrian). It represents deposition in a slowly subsiding basin where periodically subsidence outstripped sedimentation. It was followed by the Ballachulish Slate Formation, a formation characterized by sedimentation in a basin with progressive diminution of clastic supply culminating in the formation of limestones in an open marine setting.
Date taken: 01/01/2003
Photographer: Hyslop, E.K.
Copyright statement: NERC
X longitude/easting: 229820
Y latitude/northing: 785710
Coordinate reference system, ESPG code: 27700 (OSGB 1936 / British National Grid)
Orientation: Landscape
Size: 329.18KB; 1000 x 667 pixels; 85 x 56 mm (print at 300 DPI); 265 x 176 mm (screen at 96 DPI);
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