Banded Iron Formations, the common setting for iron ores, have been produced throughout geologic time wherever reducing conditions prevail in continental sedimentary basins.

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Banded Iron Formations (BIFs) are primarily associated with the Precambrian era and are thought to have formed in marine settings, not continental sedimentary basins. They are linked to periods when the oceans were rich in iron and the atmosphere had low oxygen levels.

Banded Iron Formations, the Common Setting for Iron Ores, Have