Purple and green slates of Cambrian age were worked at vast quarries on the flanks of Snowdon and at Bethesda, Dinorwig, Corris and Blaenau Ffestiniog.
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'RIGS groups' are being established in different parts of Wales with the aim of supporting locations designated as regionally important geodiversity sites and assisting in the implementation of Local Geodiversity Action Plans ('LGAPs').
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Wales' many fine cathedrals, abbeys and castles have used a variety of stones in their construction; Caerbwdi Sandstone in St David's Cathedral, Old Red Sandstone at Llanthony Priory and Tintern Abbey, 'Blue Pennant' sandstone in Caerphilly Castle and Sudbrook Sandstone at Caldicot Castle to name but a few.
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