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. 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) Connections
Has Geologic Rank
In Discipline
Precursor To
Sources
1. Paleoproterozoic (Wikipedia)
Wikimedia FoundationTable of Paleoproterozoic periodsQuote, 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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