FOSSILS

FOSSILS

ARE
remains of animals or plants that lived millions of years ago
and have become petrified.

THEY ARE USEFUL
to get information
about the evolution of that species,
the climate,
the environment,
and a geological era.

INDEX FOSSILS

used to date rocks

ARE
fossils of organisms that lived
for limited periods of time
in vast geographical areas.

Therefore,
wherever they are found on Earth,
we know that the rocks containing them
formed in the same period.