Ancient life

Fossilized structures of bacteria or algae, found in an ancient seabed now exposed in the state of Mato Grosso do Sul, Brazil. Credit: Bruno Becker-Kerber/Harvard University

540-million-year-old fossils from Brazil change understanding of the origins of animals

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Structures previously thought to be footprints of tiny marine animals have turned out to be fossilized communities of bacteria and algae. The finding suggests that some of the Ediacaran oceans did not yet support such animals.
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