| P number: | P002618 |
|---|---|
| Old photograph number: | D00236 |
| Caption: | North of Neap of Skea, Shetland Isles. Mullion structure of quartzite in mica-schist: close-up of steep folds in a series of interlayered rocks. |
| Description: | North of Neap of Skea, Shetland Isles. Mullion structure of quartzite in mica-schist: close-up of steep folds in a series of interlayered rocks. Folds developed in interbedded quartzite (metamorphosed sandstone) and mica-schist (metamorphosed mudstone). The folds developed as the layered rocks, under high temperature and pressure were shortened parallel to the layering. Under these conditions quartzite is less ductile than mica-schist and the folds acquire a characteristic cuspate-lobate shape. The rocks in the foreground have broken parallel to the layering revealing rounded (lobate) antiformal folds of the upper surface of a bed of quartzite, separated from each other by narrow, sharp-crested (cuspate) synformal folds with 'nipped-in' cores of mica-schist. The result is a linear structure (fold mullions) resembling the appearance of the clustered columns which support the arches of mullioned windows in Gothic churches. |
| Date taken: | Sun Jan 01 00:00:00 GMT 1961 |
| Photographer: | Fisher, W.D. |
| Copyright statement: | Crown |
| Acknowledgment: | This image was digitized with grant-in-aid from SCRAN the Scottish Cultural Resources Access Network |
| X longitude/easting: | 437500 |
| Y latitude/northing: | 1184500 |
| Coordinate reference system, ESPG code: | 27700 (OSGB 1936 / British National Grid) |
| Orientation: | Landscape |
| Size: | 242.67 KB; 1000 x 756 pixels; 85 x 64 mm (print at 300 DPI); 265 x 200 mm (screen at 96 DPI); |
| Average Rating: | Not yet rated |
| Categories: | Unsorted Images, Geoscience subjects/ Structural features/ Mullion |
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