cast fossil

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cast fossil (plural cast fossils)

  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.

Related terms[edit]

  • mold fossil (the rock that surrounds the cast fossil in which the cavity is in the shape of the fossil)