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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.
Limestone Features. Limestone is the name given to rock which is composed mainly of calcium carbonate. Calcium carbonate is a chemical compound of calcium, carbon and oxygen. The chemical formula for calcium carbonate is CaCO 3. Limestone is a sedimentary rock which is formed underwater.imestone Features. Limestone is the name given to rock which is composed mainly of calcium carbonate. Calcium carbonate is a chemical compound of calcium, carbon and oxygen. The chemical formula for calcium carbonate is CaCO 3. Limestone is a sedimentary rock which is formed underwater.