Paleoproterozoic
geo:time:era:paleoproterozoicPaleoproterozoic Era (2,500–1,600 Ma): Great Oxidation Event (~2,400 Ma) transforms atmosphere to oxygen-rich; first eukaryotes appear late in era.
Paleoproterozoic Era (2,500–1,600 Ma): Great Oxidation Event (~2,400 Ma) transforms atmosphere to oxygen-rich; first eukaryotes appear late in era.