Proterozoic
geo:time:eon:proterozoicProterozoic Eon (2,500–538.8 Ma): first eukaryotes (~1,800 Ma); snowball Earth glaciations; first multicellular life; Great Oxidation Event transforms atmosphere.
Proterozoic Eon (2,500–538.8 Ma): first eukaryotes (~1,800 Ma); snowball Earth glaciations; first multicellular life; Great Oxidation Event transforms atmosphere.