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....
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