A type of blue-gray limestone rock found in Dublin and Ireland, formed from ancient marine deposits and used historically in construction.
From Irish 'colpa' or related Celtic root. The term is geologically specific to Irish limestone formations and has been used since at least the 18th century in geological and construction contexts.
Dublin's iconic Georgian buildings and ancient monuments were literally built from calp limestone quarried from beneath the city itself, so when you walk Dublin's streets, you're walking on top of massive limestone deposits.
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