Great Oxidation Event ·
~2.4 Gya
un
seel
.com · oxygenic photosynthesis · banded iron · rising O₂
Onset
~2.43 Ga
Driver
cyanobacteria
phase
—
Cyanobacteria mats
O₂ bubbles
Banded iron (Fe³⁺)
O₂ level curve
Cleared sky
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.com · Great Oxidation Event