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Limestone is dissolved very slowly over a period of time. Erratics at Norber are boulders of gritstone standing on a plinth of limestone. The boulders protect the limestone from chemical weathering.

It is exotic: it sits next to an ancient village settlement, and is perpetually warm. It is huge: the stone, gigantic limestone boulders from about 4m to 18m tall at the base of a 400m wall." During ...