Atmospheric O2 rises to near modern values

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Atmospheric O2 rises to near modern values 600 mya

There is a further rise in atmospheric O2 from values of 1-10 % of modern to 100 % of modern values. This rise is associated with a second period of Snow Ball Earth and the rise of complex multicellular (but soft bodied) organisms (Ediacara biota).
Source: http://en.wikipedia.org/wiki/Ediacara_biota (Wikipedia)

Keywords: evolving_earth, climate