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Era

Proterozoic

proh-tur-uh-ZOH-ik
Proterozoic

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
Rank
Eon 1
Start (Million Years Ago)
2500 1
End (Million Years Ago)
538.8 1
Key Event
The 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

Archean, Eras

Has Geologic Rank

Geologic Eon, Concepts

In Discipline

Geochronology, Disciplines
Source Geologic Time Scale (Wikipedia)

Precursor To

Phanerozoic, Eras
Sources
1. Geologic Time Scale (Wikipedia)
Wikimedia FoundationView the Source
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