| P number: | P521277 |
|---|---|
| Caption: | Rock specimen of shale. Shore at Luing Pier, Blackmill Bay, Luing, Argyllshire, Scotland. |
| Description: | The rock is a uniform grey mudstone with prominent white quartz veining. The quartz is harder than the shale rock, so it has weathered as prominent, upstanding veins. British Geological Survey Petrology Collection sample number EMC849. Quartz veins are very common in most types of rock. They generally form at high temperatures when the rocks are deeply buried, by the percolation of hydrothermal solutions containing dissolved silica. These fluids may infill cavities such as gas bubbles in lavas to form amygdales, and also flow along fractures and faults where they may precipitate out as veins. The Easdale Slate (Easdale Subgroup, Argyll Group, Dalradian Supergroup, Precambrian) consists predominantly of black carbonaceous, pyritic slates. They are thought to be of deepwater origin. They have been extensively quarried for slate roofing material on Seil and Luing. |
| Date taken: | Sun Dec 01 00:00:00 GMT 2002 |
| Photographer: | McTaggart, F.I. |
| Associate: | T.S. Bain |
| Copyright statement: | NERC |
| Additional information: | EMC849 |
| Orientation: | Landscape |
| Size: | 218.28 KB; 1000 x 775 pixels; 85 x 66 mm (print at 300 DPI); 265 x 205 mm (screen at 96 DPI); |
| Average Rating: | Not yet rated |
| Categories: | Best of BGS Images/ Geological structures |
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