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The Coal Measures
This stone is older than it looks. Send it to someone five minutes away.
Just found The Coal Measures in Crystal Palace Geological Illustrations #5.
Upper Carboniferous ironstone, quarried at Clay Cross Colliery, Ashover, Derbyshire, England. Nearest stop: Penge West.
This stone is older than it looks — worth five minutes if you're nearby.
https://www.londonpavementgeology.co.uk/location/1934-crystal-palace-geological-illustrations-5/
The closest other recorded buildings.
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