Uploaded on:
26/12/2012 10:30:18
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P number: P805591
Caption: Aptian Sands at Windmill Pit, Stone (Lower Greensand). Excursion to Aylesbury, Hartwell and Stone, July 27th 1912.
Description: In this pit is seen a bed of white sand 9 feet in thickness and beautifully false bedded with bands of pebbles, carbonaceous sands and concretions. Above them with an apparent unconformity due to contemporaneous erosion is a bed of clay 5 to 6 feet thick with ironstone bands near the base. These sands have been bleached by the action of organic acids arising from the decomposition of vegetable matter which have run out the iron and other soluble substances leaving a nearly pure silica suitable for glassmaking.
Copyright statement: NERC
Additional information: From the Geologists' Association Carreck Archive. The Reader Geological Photographs 1910, 1911 and 1912.
Orientation: Landscape
Size: 264.78 KB; 999 x 773 pixels; 85 x 65 mm (print at 300 DPI); 264 x 205 mm (screen at 96 DPI);
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Categories: Special collections/ Geologists' Association 'Carreck Archive'/ T W Reader geological photographs 1910, 1911 and 1912  


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