Derived fossil
Encyclopedia
A derived fossil or reworked fossil is a fossil
Fossil
Fossils are the preserved remains or traces of animals , plants, and other organisms from the remote past...

 found in rock made later than when the fossilized animal or plant died: it happens when a hard fossil is freed from a soft rock formation by erosion
Erosion
Erosion is when materials are removed from the surface and changed into something else. It only works by hydraulic actions and transport of solids in the natural environment, and leads to the deposition of these materials elsewhere...

and redeposited in a currently forming sedimentary deposit.
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