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[edit] Summary

Oxygen fluctuations in the earth's atmosphere estimated over the past 500+ million years. Geological eras: Camb. - Cambrian, Ord. - Ordovician, S. - Silurian, Dev. - Devonian, Carb. - Carboniferous, Pe. - Permian, Tri. - Triassic, Jur. - Jurassic, Cret. - Cretaceous, Cen. - Cenozoic

Accompanying evolutionary and geological events:

• 1) Radiation of animal phyla (Cambrian explosion)
• 2) First land plants
• 3) Ordovician-Silurian extinction events
• 4) Huge forests form on land, first land animals and seed plants
• 5) Coal formation, first conifers, insect and amphibian giantism
• 6) Low ocean levels, supercontinent Pangaea forms
• 7) Permian-Triassic extinction event
• 8) First primitive flowering plants and dinosaurs
• 9) Triassic-Jurassic extinction event
• 10) Age of dinosaurs
• 11) Radiation of flowering plants
• 12) Cretaceous-Tertiary extinction event
• 13) Radiation of mammals

(Created using Powerpoint, for sources also see:

• Paleos: The oxygen atmosphere
• Introduction to geochemical cycles)

[edit] Licensing

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