| P number: | P521507 |
|---|---|
| Caption: | Rock specimen of crenulated pelite. West end of Creag Mhor, Glen Muilinn, Glen Lyon, Perthshire. |
| Description: | The sample is a dark grey, fine-grained pelitic rock which has been deformed and tightly crenulated, producing a strong surface lineation. The rock is domiantly composed of very fine grained mica minerals, giving it a strong surface sheen. British Geological Survey Petrology Collection sample number EMC 1580. A crenulation is a small-scale folding with a wavelength of up to a few millimetres. It typically occurs along the cleavage planes of a deformed rock, and is related to a larger scale folding. When viewed from above or directly onto a cleavage plane a crenulation typically appears as a series of parallel lines, known as a crenulation lineation. This sample is from the Dalradian rocks of Glen Lyon which contains one of the most structurally complex tracts of the Dalradian Supergroup. The Ben Eagach Schist can be traced from north of Tyndrum eastwards to north of Loch Lyon and then continuously from north of Schiehallion and lower Glen Lyon to Ben Vrackie. It consists predominantly of distinctive dark grey to black graphitic schists, with impersistent thin limestones and amphibolites. Most of the stratbound mineralisation in the Dalradian occurs in this formation. |
| Date taken: | Wed Jan 01 00:00:00 GMT 2003 |
| Photographer: | Unknown |
| Copyright statement: | NERC |
| Orientation: | Landscape |
| Size: | 301.13 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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