| P number: | P001848 |
|---|---|
| Old photograph number: | B00922 |
| Caption: | North Queensferry, Fifeshire. Spheroidal weathering of dolerite sill. |
| Description: | North Queensferry, Fifeshire. Spheroidal weathering of dolerite sill. Part of the Midland Valley quartz-dolerite sill exposed by quarrying or railway cutting. Chemical weathering of iron- and magnesium-rich rocks commences along the line of joints, where circulating groundwater rapidly alters the rock to chlorite minerals. Thereafter, weathering slowly attacks the fault blocks from the outside, replacing the hard, tough, dark blue-grey dolerite by softer brown rock which still retains its mineral texture, until only spheroidal cores of fresh rock remain. |
| Date taken: | Mon Jan 01 00:00:00 GMT 1912 |
| Photographer: | Lunn, R. |
| Copyright statement: | Crown |
| Acknowledgment: | This image was digitized with grant-in-aid from SCRAN the Scottish Cultural Resources Access Network |
| X longitude/easting: | 313500 |
| Y latitude/northing: | 680500 |
| Coordinate reference system, ESPG code: | 27700 (OSGB 1936 / British National Grid) |
| Orientation: | Landscape |
| Size: | 273.06 KB; 1000 x 726 pixels; 85 x 61 mm (print at 300 DPI); 265 x 192 mm (screen at 96 DPI); |
| Average Rating: | Not yet rated |
| Categories: | Unsorted Images, Geoscience subjects/ Igneous features/ Volcanic vents, necks and plugs, Geoscience subjects/ Landforms, weathering/ Rock weathering, Geoscience subjects/ Landforms, weathering/ Weathering along bedding. Joints, cleavage |
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