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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.
Flint is found in areas with chalk bedrock, this is because flint formed within the sediment that later became chalk. ADVERTISEMENT BY UKGE - OFFICIAL ADVERTISING PARTNER OF DISCOVERING FOSSILS. Left: A large selection of flint fossil echinoids found at Littlehampton.