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Dolerite
This stone is older than it looks. Send it to someone five minutes away.
Just found Dolerite in Betws-y-Coed Station.
Ordovician dolerite, quarried at Conwy Valley, Gwynedd, Wales. Nearest stop: Betws-y-Coed.
This stone is older than it looks — worth five minutes if you're nearby.
https://www.londonpavementgeology.co.uk/location/3945-betws-y-coed-station/
The closest other recorded buildings.
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