| P number: | P519599 |
|---|---|
| Caption: | Specimen of roofing slate from Aberfoyle Slate Quarries, Perthshire, Scotland |
| Description: | Dark grey slate, termed 'blue variety', showing very strong banding or 'ribboning'. The specimen is of Precambrian, Dalradian age. British Geological Survey Petrology Collection sample number EMC 5774. Ribboning occurs when the original sedimentary bedding surfaces intersect the slaty cleavage surface. It shows the original nature of the mudstone or siltstone sedimentary rock from which the slate has formed as a result of metamorphic processes. The bands represent slightly different periods of sediment deposition, when conditions would vary. Some bands are thin and dark and represent very fine-grained periods of deposition. Others are lighter and coarser-grained, representing deposition of fine sand or silty sediments. |
| Date taken: | Wed Jan 01 00:00:00 GMT 2003 |
| Photographer: | Bain, T.S. |
| Copyright statement: | NERC |
| Orientation: | Portrait |
| Size: | 131.10 KB; 775 x 1000 pixels; 66 x 85 mm (print at 300 DPI); 205 x 265 mm (screen at 96 DPI); |
| Average Rating: | Not yet rated |
| Categories: | Unsorted Images |
Loading...
Loading...
Reviews
There is currently no feedback