Ferruginous Stromatolites (IMAGE)

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.

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