The remains (or an impression) of a plant or animal that existed in a past geological age and that has been excavated from the soil
The process of turning some plant material into stone by infiltration with water carrying mineral particles without changing the original shape
A space in a rock that has the shape of the remains of a living thing that once occupied that space.
A type of fossil that forms when a mold becomes filled in with minerals that then harden.
Hardened tree sap