| P number: | P552892 |
|---|---|
| Caption: | Cornstone. Quarry 400 yards W. by N. of Selms, 1.25 miles south of East Calder. Mid Lothian. |
| Description: | A nodular rock composed of larger buff nodules which effervesce freely in cold dilute HCl and greenish non-effervescent nodules, in a fine breccia-like base containing much recrystallized or infiltrated calcite. The slide appears to include only the greenish nodules and these are composed of silty micaceous argillite or mudstone, marginally replaced by prisms of calcite growing in from the infilling calcite. The latter is composed of coarse grains which show growth zones and in places two periods of growth separated by a period of silica deposition. Some of the vein-like infillings contain also a central deposit of chalcedonic quartz. Mudstone, calcite-veined. SL0180. Britrocks S34901. Magnification x40. Light PPL. |
| Date taken: | Wed Jan 21 00:00:00 GMT 2004 |
| Photographer: | Sutherland, A. |
| Copyright statement: | NERC |
| Additional information: | Description from: Limestones of Scotland: chemical analyses and petrography. Edinburgh : HMSO, 1956. |
| Orientation: | Landscape |
| Size: | 315.78 KB; 1000 x 750 pixels; 85 x 64 mm (print at 300 DPI); 265 x 198 mm (screen at 96 DPI); |
| Average Rating: | Not yet rated |
| Categories: | Unsorted Images |
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