Geologist here. Yeah, there are a few places you can find microbial survivors of the GOE: https://en.wikipedia.org/wiki/Green_sulfur_bacteria https://en.wikipe

Geologist here. Yeah, there are a few places you can find microbial survivors of the GOE: https://en.wikipedia.org/wiki/Green_sulfur_bacteria https://en.wikipedia.org/wiki/Green_sulfur_bacteria https://en.wikipedia.org/wiki/Purple_sulfur_bacteria https://en.wikipedia.org/wiki/Purple_sulfur_bacteria Obligate anaerobic photoautotrophs: they photosynthesize, and need light to survive, but don't produce (and are killed by) O2. Unfortunately for them, post-GOE, there aren't many habitats that are anoxic but still have much light! There's at least one clade of "green sulfur bacteria" that apparently lives off the basically-invisible glow from a black smoker at a mid-ocean ridge: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1166624/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1166624/ fascinating stuff!