Banded iron formations (BIFs) contain well developed iron-rich thin alternating layers or laminations as seen here. This formation occurs due to the lack of burrowing species in the Precambrian period in which this sedimentary rock was created. The name comes from the various coloured layers.

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Banded iron formations (BIFs) contain well developed iron-rich thin alternating layers or laminations as seen here. This formation occurs due to the lack of burrowing species in the Precambrian period in which this sedimentary rock was created. The name comes from the various coloured layers. Odra Noel. Attribution-NonCommercial 4.0 International (CC BY-NC 4.0). Source: Wellcome Collection.