The longest eon, spanning almost two billion years, in which Earth's atmosphere gained free oxygen and life grew from single cells into the first multicellular organisms. This description is adapted from Wikipedia contributors under CC BY-SA 4.0; changes were made. https://creativecommons.org/licenses/by-sa/4.0/
Facts
Start (Million Years Ago) End (Million Years Ago) Key EventThe Great Oxidation Event, when photosynthesis raised atmospheric oxygen for the first time, and the later evolution of the first complex, multicellular life. 1 Connections
Anticipated By
Has Geologic Rank
In Discipline
Source Geologic Time Scale (Wikipedia)
Precursor To
Sources
1. Geologic Time Scale (Wikipedia)
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