Time runs left (older) → right (younger) · Hover a card for details
Great Oxidation Event; first eukaryotes (2500-1600 Ma).
2.50 Ga – 1.60 Ga · 900.00 Ma duration
Axis labels in Ma (millions of years ago) ·
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Paleoproterozoic Era 3
2450 Ma – 2320 MaGreat Oxidation EventOxygen fills the atmosphereCyanobacteria flood the atmosphere with oxygen, rusting the oceans and enabling complex aerobic organisms.
2400 Ma – 2100 MaHuronian GlaciationFirst Snowball Earth candidatePossibly the earliest global glaciation, lasting ~300 million years, triggered by rising oxygen levels.
2100 MaFirst EukaryotesCells with a nucleus appearFirst cells with a true nucleus and organelles — ancestors of all plants, animals and fungi.