Before revision: This coincided with a 300 million year-long global ice age known as the Huronian glaciation (which might also have been partly caused by the oxidative depletion of the atmospheric methane — a powerful greenhouse gas — due to the Great Oxygenation) and devastated the anaerobic archaeal biota, leaving the niches open for eubacteria (both the aerobic proteobacteria and the photosynthetic cyanobacteria) to exploit and prosper.
After revision: This coincided with a 300 million year-long global ice age known as the Huronian glaciation (which might also have been partly caused by the oxidative depletion of the atmospheric methane — a powerful greenhouse gas — due to the Great Oxygenation) and devastated the anaerobic with antioxident capabilities biota, leaving the niches open for eubacteria (both the aerobic proteobacteria and the photosynthetic cyanobacteria) to exploit and prosper.