Banded Iron Formation

A nearly 3-billion-year-old banded iron formation from Canada shows that the atmosphere and ocean once had no oxygen. 

Jaspilite banded iron formation (BIF) (Ironwood Iron-Forma…

Banded Iron Formation by Carlos Clarivan/science Photo Library

Paleoproterozoic Banded Iron Formation of the Quadrilátero

Banded iron formation from Michigan, USA

Banded Iron Formation

Banded iron formation - Wikipedia

What is the BIF slab? Western Australian Museum

Banded Iron Formation at Jasper Knob in Michigan

Microbial processes during deposition and diagenesis of Banded

File:Banded iron formation (Goldman Meadows Formation, Mesoarchean; Atlantic City Iron Mine, South Pass, Wyoming, USA) 2 (30749219994).jpg - Wikipedia