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Major Events in the Paleozoic Eon

Type in the Eras and major events in the Paleozoic Eon
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Oakenshield97
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Last updated: June 2, 2026
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First submittedJune 2, 2026
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Average score8.3%
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2.5–1.6 billion years ago
Paleoproterozoic Era
2.5–2.3 billion years ago
Siderian Period
1st major event
Breakup of "Kenorland"
2nd major event
Beginning of Great Oxidation Event
3rd major event
Beginning of Huronian Glaciation
2.3–2.05 billion years ago
Rhyacian Period
1st major event
End of Huronian Glaciation
Biota 1
Diskagma
Biota 2
Francevillian biota
2.05–1.8 billion years ago
Orosirian Period
1st major event
End of Great Oxidation Event
2nd major event
Vredefort impact
3rd major event
Formation of "Columbia"
1.8–1.6 billion years ago
Statherian Period
1st major event
Beginning of the "Boring Billion"
1.6–1.0 billion years ago
Mesoproterozoic Era
1.6–1.4 billion years ago
Calymmian Period
major event
Breakup of "Columbia"
1.4–1.2 billion years ago
Ectasian Period
1.2–1.0 billion years ago
Stenian Period
major event 1
Formation of "Rodinia"
major event 2
first sexually reproducing organisms
1000 - 538.8 million years ago
Neoproterozoic Era
1000 - 720 million years ago
Tonian Period
major event 1
end of "Boring Billion"
major event 2
first sponge-like animal "Otavia"
720 - 635 million years ago
Cryogenian Period
major event 1
Sturtian Glaciation
major event 2
Marinoan Glaciation
635 - 538.8 million years ago
Ediacaran Period
major event 1
Formation of "Gondwana"
major event 2
Lantian biota appears
major event 3
Gaskiers Glaciation
major event 4
Baykonurian Glaciation
major event 5
Avalon explosion (270 species)
major event 6
Formation of ozone
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