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Limestones are sedimentary rocks composed of calcium carbonate, often the detrital remains of shells or skeletons of marine organisms. Usually grey, white or yellow in colour.

Imported Portland Limestone was used throughout Northern Ireland for carving detail and prestigious buildings such as Parliament Buildings Stormont and City Hall. Local limestones include Antrim Chalk and the Carboniferous limestones of Armagh and Fermanagh.

Limestone sub-categories