| P number: | P001964 |
|---|---|
| Old photograph number: | C00704 |
| Caption: | Downan shore, 1.6 km. south of Ballantrae, Ayrshire. Ordovician pillow lavas with interstices filled with limestone and chert. Rocks are scoured by recent wave action. |
| Description: | Downan shore, 1.6 km. south of Ballantrae, Ayrshire. Ordovician pillow lavas with interstices filled with limestone and chert. Rocks are scoured by recent wave action. Pillow lavas are indicative of submarine extrusion. The limestone and chert probably precipitated from contemporary sea water as the lavas cooled. The lavas form part of the Downan Point Lava Formation, thought to be of Caradoc age. Pillow lavas form when molten magma is erupted underwater and the surface is cooled rapidly to form a hard crust. Tongues of hot lava burst through weak points in the crust and subsequently neck-off as large sack-like blobs of lava. These are still soft and they commonly roll down the front of the lava flow to form pillow shapes. |
| Date taken: | 01/01/1897 |
| 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: | 206500 |
| Y latitude/northing: | 580500 |
| Coordinate reference system, ESPG code: | 27700 (OSGB 1936 / British National Grid) |
| Orientation: | Landscape |
| Size: | 299.67 KB; 1001 x 727 pixels; 85 x 62 mm (print at 300 DPI); 265 x 192 mm (screen at 96 DPI); |
| Average Rating: | Not yet rated |
| Categories: | Best of BGS Images/ Images from the archives, Geoscience subjects/ Igneous features/ Pillow lavas |
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