http://earthwise.bgs.ac.uk/index.php?action=history&feed=atom&title=File%3AP805591.jpg 2026-07-08T17:16:14Z Revision history for this page on the wiki MediaWiki 1.42.3 http://earthwise.bgs.ac.uk/index.php?title=File:P805591.jpg&diff=50827&oldid=prev 2020-09-30T22:52:55Z

<p>User created page with UploadWizard</p> <p><b>New page</b></p><div>=={{int:filedesc}}==<br /> {{Information<br /> |description={{en|1=Aptian Sands at Windmill Pit, Stone (Lower Greensand). Excursion to Aylesbury, Hartwell and Stone, July 27th 1912. 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. BGS image P805591.}}<br /> |date=2020-09-30<br /> |source=British Geological Survey<br /> |author=British Geological Survey<br /> |permission=<br /> |other versions=<br /> }}<br /> <br /> =={{int:license-header}}==<br /> {{subst:Custom license marker added by UW}}<br /> {{BGS}}</div>

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