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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.
Ribblehead, North Yorkshire. 1  One of the largest areas of limestone [limestone: A sedimentary rock consisting mainly of calcium carbonate. 2  It is commonly used as a building stone. ] 3  in the UK is found in the Yorkshire Dales National Park, near Malham and Ingleton.4  Limestone is a sedimentary rock made of calcium carbonate. It is commonly used as a building stone. ] 2  in the UK is found in the Yorkshire Dales National Park, near Malham and Ingleton. 3  Limestone is a sedimentary rock made of calcium carbonate.