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Eras

Siderian

Proterozoic

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The first period of the Paleoproterozoic era, spanning 2.5 billion to 2.3 billion years ago. Atmospheric free oxygen rose permanently during the Siderian and the following Rhyacian period in the Great Oxidation Event, the first great environmental crisis in Earth's history, driven by photosynthetic cyanobacteria and ending the planet's prior anoxic atmosphere.

Facts
Rank
Period 1
Start (Million Years Ago)
2500 1
End (Million Years Ago)
2300 1
Cross-Tradition Connections

In Discipline

Geochronology, Disciplines

Part Of

Paleoproterozoic, Eras

Precursor To

Rhyacian, Eras
Sources
1. Paleoproterozoic (Wikipedia)
Wikimedia FoundationTable of Paleoproterozoic periods
Quote, Table of Paleoproterozoic periods
atmospheric free oxygen levels soared permanently during the Siderian and Rhyacian periods in an aerochemical event called the Great Oxidation Event
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