A nearly 3-billion-year-old banded iron formation from Canada shows that the atmosphere and ocean once had no oxygen.
Banded iron formation - Wikipedia
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File:Banded Iron Formation of Hamersley Range DSCN2938.jpg - Wikipedia
Banded Iron Formation - an overview
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Banded Iron Formation
Banded Iron Formation - The Australian Museum
File:Glacially eroded jaspilite banded iron formation outcrop
7. Banded Iron Formations (BIFs) from Sandur in India (Left) and
Microbial processes during deposition and diagenesis of Banded
Banded Iron Formation