2021-10-13 04:49:32 +00:00
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# Geologic Timeline
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- [[Hadean]]: 4.571 BYA to 4.0 BYA
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- Named due to hellish conditions
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- [[Archaean]]: 4.0 BYA to 2.5 BYA
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- Reasonably condusive to life
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- Pretty certain that cellular life originated here
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- 3.48 BYA: First cellular life, [[Stromatolites]]
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- 3 BYA: Oxygenic photosynthesis defines the end of the Archaean
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- [[Proterozoic]]: 2.5 BYA to 541 MYA
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- 2.8 BYA to 1.9 BYA: Banded Iron Formations imply periods of high
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oxygenation
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- CH₄ (Methane) + 2O₂ → CO₂ + 2H₂O: Methane concentration decreased, while
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Oxygen and CO₂ increased
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2021-11-19 08:36:29 +00:00
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- [[huronian-glaciation|Huronian Glaciation]]
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2021-10-13 04:49:32 +00:00
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- [[Ediacaran]]
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- [[Phanerozoic]]: 541 MYA to Present
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- Started with a mass-extinction event
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- Divided into [[Paleozoic]], [[Mesozoic]], and [[Cenozoic]]
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