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As with all exploratory science, the answer to the oldest fossil changes with time, as new discoveries and evaluation techniques are made.

The Gunflint Chert along the northern shore of Lake Superior, produces definite fossils, and these date to about 2.0 Ga ago (Ga = 10^9 years). Other sites also lay claim, and of course the determination of these very early fossils is difficult, if not actually uncertain.

A site in Western Australia at Warrawoona, also produces probable early fossils from about 3.4Ga ago. Sites in Canada and India also show promise of very early life forms. Amazingly enough one of these early organisms, a blue-green algae helps form Stromatolites, and a famous site where they may still be seen growing, is at Shark Bay in NW Australia. [That is not to suggest that the individuals from long ago are still living.]

And of course, Antarctica still largely remains to be discovered.

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