|The Dragon's Back|
the National Museum Wales have been digging at another outcrop in the Preselis. This is Craig Rhosyfelin, less than a mile north of Care Meini. What they found there excited them. Because bluestone outcrops is formed in huge slabs, they think it would have been possible to break off ‘monolith-sized’ slabs by hammering wooden wedges into cracks and wetting them thoroughly. As the wood swelled, the slab would simply break off, ready to be carted away.