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The Burren is underlain by limestones of the Lower Carboniferous (Visean) period. The limestone formed as sediments in a tropical sea which covered most of Ireland approximately 350 million years ago.
(92Kb) This dramatic site, on the karstic limestone pavement of the Burren, is one of the most famous Irish dolmens. The name Poulnabrone literally means 'The hole of the sorrows'. The thin capstone sits on two 1.8m (6ft) high portal stones to create a chamber in a 9m (30ft) low cairn.