| P number: | P528001 |
|---|---|
| Caption: | Photomicrograph of cementstone. Light: XPL. Magnification: x2.5. Linhouse Water, 120 yards north-west of the upper (south) railway viaduct, 2 miles south of Mid Calder, Midlothian, Scotland. |
| Description: | A dull compact grey rock, composed mainly of grains of carbonate, 0.005-0.01 mm across, which by refractive index tests is shown to be ferriferous dolomite. Slightly larger grains up to 0.02 mm are much altered to limonite and probably represent original siderite. This specimen is Calciferous Sandstone Series (Carboniferous) in age. BGS sample number SL 181. British Geological Survey Petrology Collection sample number S 34902. Photomicrograph details: Light: XPL, Magnification: x2.5. In thin seams rich in quartz and muscovite the carbonates are less finely grained and oxidized siderite up to 0.05 mm can be distinguished among clear finely granular carbonate. Fresh biotite is present but scarce in these seams and alkali-feldspar, muscovite and chlorite also are present. Contemporaneous brecciation of the fine-grained dolomite into the arenaceous seams suggest that the dolomite is an original precipitation or a lime-mud contemporaneously dolomitized. The rock is a micrograined ferriferous dolomite with arenaceous laminae. |
| Date taken: | Sun Jun 25 00:00:00 GMT 1905 |
| Photographer: | Unknown |
| Copyright statement: | Unknown |
| Orientation: | Landscape |
| Size: | 267.95 KB; 1000 x 663 pixels; 85 x 56 mm (print at 300 DPI); 265 x 175 mm (screen at 96 DPI); |
| Average Rating: | Not yet rated |
| Categories: | Unsorted Images |
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