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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.
What is calcium carbonate? According to Wikipedia, calcium carbonate is a chemical compound with the formula CaCO3. It is a common substance found in rocks, and is the main component of shells of marine organisms, snails, coal balls, pearls, and eggshells.alcium carbonate is added to dog food for 3 primary reasons. First, it is an inexpensive source of calcium, which is an essential mineral for dogs. Second, it is used as a preservative. Thirdly, it is used as a color retention agent.