Garth Bank Quarry

Garth Bank Quarry is a Site of Special Scientific Interest in Brecknock, Powys, Wales. The Countryside Council for Wales describes the significance of the quarry as follows: `The rocks in this quarry are siltstones and pebbly sandstones of late Ordovician and early Silurian age, approximately 440 to 445 million years old. The rocks provide an ins....
Found on http://en.wikipedia.org/wiki/Garth_Bank_Quarry
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