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Iron formations and their paleobiology. (A) Filamentous and coccoidal microfossils in stromatolitic iron formation of the 1900 to 1850 Ma Gunflint Formation, Ontario. (B) Unusual microfossil in basinal chert of the Gunflint Formation. (C) Banded iron formation, 2480 to 2495 Ma Brockman Iron Formation, Western Australia; reddish and whitish bands reflect iron- and silica-rich layers, respectively. Scale bars, 25 µm (A); 10 µm (B); 3 cm (C).
