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Fossils

What is a cast fossil?

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2014-12-13 17:27:54

One form of fossil forms when an organism dies and its body is

covered by layers of sediment. As time passes, the organism itself,

particularly when composed primarily of softer materials, is eroded

and carried away, leaving a negative imprint of its body. 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. This is called a cast fossil.


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