…the remains or impression of a prehistoric plant or animal embedded in rock and preserved in petrified form…
…a natural fuel such as coal or gas, formed in the geological past from the remains of living organisms…
…the record of the occurrence and evolution of living organisms through geological time as inferred from fossils…
…a fossil that is useful for dating and correlating the strata in which it is found…
…a fossil of a footprint, trail, burrow, or other trace of an animal rather than of the animal itself…
…a fossil redeposited in a sediment which is younger than the one in which it first occurred…
