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garden/geologic-timeline.md

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Geologic Timeline

  • Hadean: 4.571 BYA to 4.0 BYA
    • Named due to hellish conditions
  • Archaean: 4.0 BYA to 2.5 BYA
    • Reasonably condusive to life
    • Pretty certain that cellular life originated here
    • 3.48 BYA: First cellular life, Stromatolites
    • 3 BYA: Oxygenic photosynthesis defines the end of the Archaean
  • Proterozoic: 2.5 BYA to 541 MYA
    • 2.8 BYA to 1.9 BYA: Banded Iron Formations imply periods of high oxygenation
    • CH₄ (Methane) + 2O₂ → CO₂ + 2H₂O: Methane concentration decreased, while Oxygen and CO₂ increased
    • huronian-glaciation
    • Ediacaran
  • Phanerozoic: 541 MYA to Present