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cast-fossil definition: Noun (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, also call...
A fossil skeleton is not hard to understand, it is mineralized bone. Impressions are similar to pressing a leaf in a book to dry and preserve it. A cast is a little different. A cast is defined as: The secondary rock or mineral that fills a natural mold, producing a replica of a fossil. (emphasis added) Bates, R. L., Jackson, J. A., editors, (prepared by the American Geological Institute), 1976, Dictionary of Geological Terms, third edition; Anchor Books (Doubleday).