Banded Iron Formation

A nearly 3-billion-year-old banded iron formation from Canada shows that the atmosphere and ocean once had no oxygen. 

File:Glacially eroded jaspilite banded iron formation outcrop

Banded Iron Formation stock image. Image of drilled - 176252629

Banded iron formation (BIF) - Stock Image - C029/7116 - Science

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Banded Iron Formation BIF

Banded Iron Formation by Carlos Clarivan/science Photo Library

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Banded iron formation in Barberton Mountain Land - Mountain

Banded iron formations: oceans, algae and iron oxide - CSIRO