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There are mold and cast fossils in many local creeks, streams, and/or rivers.

If the original organism dissolves or decays, leaving a hollow in the rock, that is a mold.

If the mold fills up with sediment which gradually hardens into the shape of the original organism, then that is a cast.

Casts are copies of fossilized plants or animals. Molds are hollow impressions of the fossil.
Its a Fossil.

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