File:Oxygenation-atm.svg

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Summary

Description	English: Estimated evolution of atmospheric $\ P_{{O_{{2}}}}$ . The upper red and lower green lines represent the range of the estimates. 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) .
Date	29 June 2006
Source	File:Oxygenation-atm.png
Author	Heinrich D. Holland
Permission ( Reusing this file)	I hereby grant Wikipedia the license under GFDL to use Figure 10 of my recent paper on the oxygenation of the atmosphere and oceans.

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