Image: Oxygenation-atm
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Description: Estimated evolution of atmospheric PO2{\displaystyle \ 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)
Title: Oxygenation-atm
Credit: File:Oxygenation-atm.png
Author: Heinrich D. Holland
Permission: I hereby grant Wikipedia the license under GFDL to use Figure 10 of my recent paper on the oxygenation of the atmosphere and oceans.
Usage Terms: Creative Commons Attribution-Share Alike 3.0
License: CC-BY-SA-3.0
License Link: http://creativecommons.org/licenses/by-sa/3.0/
Attribution Required?: Yes
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