English: Estimated evolution of atmospheric and the concentration of O2 in the shallow and deep oceans. The stages are: stage 1 (3.85–2.45Gyr ago (Ga)), stage 2 (2.45–1.85Ga), stage 3 (1.85–0.85Ga), Stage 4 (0.85–0.54Ga )and stage 5 (0.54Ga–present)
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== Summary == {{Information |Description=Estimated evolution of atmospheric <math>\ P_{{O_{{2}}}}</math> and the concentration of O<sub>2</sub> in the shallow and deep oceans |Source=http://dx.doi.org/10.1098/rstb.2006.1838 figure 10 |Date=June 29, 2006