Free Oxygen and the Early Ocean & Atmosphere

Recently some new evidence has been uncovered about when the earth's atmosphere began to be oxygenated.  In addition to obviously affecting the composition of the atmosphere, that oxygenation event would have impacted ocean chemistry as well.  It's thought that this oxygenation was brought about by simple cyanobacteria, amongst the simplest photosynthetic organisms on the planet.



Earth Oxygenation