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Contact: Kea Giles
Geological Society of America

Ferruginous Stromatolites

Caption: These are approximately 1.8-billion-year-old ferruginous stromatolites from the Biwabik Iron Formation, Minn., USA.

Credit: E. Calvin Alexander Jr. for GSA Special Paper 504

Usage Restrictions: Credit to GSA and the photographer, E. Calvin Alexander Jr.

Related news release: Early Earth

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