| P number: | P001729 |
|---|---|
| Old photograph number: | B00317 |
| Caption: | Drumadoon, south-west Arran, Buteshire. Sill of columnar quartz porphyry, with little sill of basalt and beds of Triassic sandstone and shale below. |
| Description: | Drumadoon, south-west Arran, Buteshire. Sill of columnar quartz porphyry, with little sill of basalt and beds of Triassic sandstone and shale below. Composite sill. Basaltic and granitic magmas have partly mixed prior to intrusion. The main body of the sill is quartz porphyry, an acid rock which, however, contains inclusions of more basic rock. The outer skin of quartz dolerite contains quartz xenocrysts, indicating some mixing of magma before intrusion. Columnar jointing well developed in the main quartz porphyry. The quartz dolerite is the darker rock with closer jointing just above the contact. Dune cross-bedding visible in sandstones below contact. |
| Date taken: | Fri Jan 01 00:00:00 GMT 1897 |
| 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: | 188500 |
| Y latitude/northing: | 628500 |
| Coordinate reference system, ESPG code: | 27700 (OSGB 1936 / British National Grid) |
| Orientation: | Landscape |
| Size: | 292.81 KB; 1000 x 749 pixels; 85 x 63 mm (print at 300 DPI); 265 x 198 mm (screen at 96 DPI); |
| Average Rating: | Not yet rated |
| Categories: | Unsorted Images, Geoscience subjects/ Igneous features/ Sills |
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