cast fossil

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cast fossil ‎(plural cast fossils)

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  1. A fossil formed when an animal, plant, or other organism dies, its flesh decays and bones deteriorate due to chemical reactions; minerals gradually enter into the cavity, resulting in a cast, which is in the general form of the original organism. A mold fossil is the rock that surrounds the cast fossil in which the cavity is in the shape of the fossil (very similar to a clay mold).