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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.
Coral Skeleton Like most animals, coral have a skeleton, but unlike mammals and fish, their skeleton is formed by the outer skin and is exÂ­ternal to the polyp. This exoskeleton is made up of a white, chalky material called calcium carbonate, which is known more commonly as limestone.Much of the limestone that makes up northÂ­ern Saipan is made up of the remains of corals and other animals and plants that form calcium carbonate skeletons.ach polyp is like a tiny anemone (or jellyfish on its back) which secretes a calcium carbonate, or limestone skeleton on/in which it lives......that means corals are made up of calcium carbonate(which bones are made up of) which are secreted by the polyps.