What Is a Cast Fossil?

By Staff WriterLast Updated Mar 27, 2020 9:58:36 AM ET
cast-fossil
Alice Cahill/Moment/Getty Images

A cast fossil preserves the impression of the hard parts of an organism, such as a shell or exoskeleton. Cast fossils are most commonly found in sandstones and other porous rocks. Since hard parts do not decay as quickly as softer tissues, they are most likely to leave cast fossils.

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