Assertion: iron's point | /r/AtLocation | ancient earth
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text: However, with the discovery of Fe(II) oxidation carried out within anoxic conditions in the late 1990s  by using the light as energy source or chemolithotrophically, using a different terminal electron acceptor (mostly NO 3 -), arose the suggestion that the anoxic Fe2+ metabolism, pre-dates the anaerobic Fe2+ oxidation, whereas the age of the BIF pre-dates the oxygenic photosynthesis  pointing the microbial anoxic phototrophic and anaerobic chemolithotrophic metabolism may have been present in the ancient earth, and together with the Fe(III) reducers, they had been the responsible for the BIF in the Pre-Cambrian era