Microbes and minerals may have set off Earth's oxygenation
news.mit.edu
news.mit.edu
This research is additional details/evidence on the evolutionary path of the suspect life forms.
The Great Oxidation Event was also the largest mass extinction event in planet's history. Prior to mass availability of oxygen almost all organisms were anaerobic and oxygen was poisonous to them, just like other strong oxidants, for example chlorine or fluorine, are poisonous to us.
This took around 750 million years. Rust, slowly raining down onto the seabed, for three quarters of a billion years. Deep time is chilling.
And also the fact that it was "banded" indicates that there may have been periodic local surges of oxygen like an "agal bloom", which would have been self-limiting when the producing organisms were poisoned by their own wastes.