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This type of fossil is called a mold. A cast fossil forms when a mold fossil is filled with some form of mineral, usually through the seepage of water depositing the minerals within the mold. In time, the mold is filled and the materials deposited harden, creating a replica of the original fossil.

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mold fossil show an impression of an organism in a rock..example..like the misquito in the movie jarrasic park.in petrified rock ...cast fossil forms when a lant or animal dies and it's flesh decays and bones detoriate due to chemical reactions

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