| P number: | P002389 |
|---|---|
| Old photograph number: | C02734 |
| Caption: | Columnar basalt and natural arch, Carsaig Arches, south Mull, Argyllshire. |
| Description: | Columnar basalt and natural arch, Carsaig Arches, south Mull, Argyllshire. Old sea stack with natural arch cut in tuffs (volcanic ash). The cliffs in the left background, probably part of a lava flow or sill, display good examples of columnar jointing in the basalt. Note the scree on left which is composed of basalt blocks broken off from the columns. Part of the Mull Tertiary volcanic centre. Columnar jointing is a characteristic feature of many minor intrusions. It is especially obvious in sills where the columns are commonly vertical. They originate with the development of a regular series of contraction joints as the rock cools from molten magma and crystallizes to a solid state. The columns are commonly hexagonal in pattern when viewed end-on. |
| Date taken: | Thu Jan 01 00:00:00 GMT 1920 |
| Photographer: | Manson, W. |
| Copyright statement: | Crown |
| Acknowledgment: | This image was digitized with grant-in-aid from SCRAN the Scottish Cultural Resources Access Network |
| X longitude/easting: | 153500 |
| Y latitude/northing: | 721500 |
| Coordinate reference system, ESPG code: | 27700 (OSGB 1936 / British National Grid) |
| Orientation: | Landscape |
| Size: | 196.19 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/ Igneous features/ Lava flows |
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