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Eras

Paleoproterozoic

Proterozoic

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The first and longest of the Proterozoic eon's three eras, spanning 2.5 billion to 1.6 billion years ago. It is defined by the Great Oxidation Event, in which atmospheric free oxygen rose from near nothing to a meaningful fraction of modern levels, and by the roughly 300 million year Huronian glaciation and the assembly of the early supercontinent Columbia, also called Nuna.

Facts
Rank
Era 1
Start (Million Years Ago)
2500 1
End (Million Years Ago)
1600 1
Key Event
Atmospheric free oxygen levels soared permanently during the Siderian and Rhyacian periods in an aerochemical event called the Great Oxidation Event. 1
Cross-Tradition Connections

Encompasses

Orosirian, Eras
Rhyacian, Eras
Siderian, Eras
Statherian, Eras

In Discipline

Geochronology, Disciplines

Part Of

Proterozoic, Eras

Precursor To

Mesoproterozoic, Eras
Sources
1. Paleoproterozoic (Wikipedia)
Wikimedia FoundationLead section
Quote, Lead section
spanning from 2,500 to 1,600 million years ago
View the Source
1. Paleoproterozoic (Wikipedia)
Wikimedia FoundationGreat Oxidation Event section
Quote, Great Oxidation Event section
Atmospheric free oxygen levels soared permanently during the Siderian and Rhyacian periods in an aerochemical event called the Great Oxidation Event.
View the Source
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