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Most calcium carbonate deposits are made up of the skeletal remains of marine plants and animals that have fallen to sediment on the bottom of shallow seas after their death. If the conditions are right, these sediments can build up over geological time to form extremely thick layers.
Calcium Carbonate. The chemical compound calcium carbonate is composed of calcium, carbon and oxygen. A simplified equation for its formation would be the addition of calcium, oxygen and carbon dioxide to form CaCO3, the chemical formula for calcium carbonate. A major source of the compound is marine organisms such as coral, shellfish and mollusks, which use it to construct their shells, or skeleton-like casing.