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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 is a type of sedimentary rock made of calcium carbonate. Limestone can be composed of skeletal remains of organisms, chemically precipitated from sea water that is super-saturated with calcium carbonate or a combination of both.