1. Formed in the later of two divisions of the Precambrian era
   "proterozoic life forms"

1. From 2,500 to 544 million years ago; bacteria and fungi; primitive multicellular organisms
   - Proterozoic eon, Proterozoic aeon

See also: early

Type of: aeon, eon

Part of: Precambrian, Precambrian aeon, Precambrian eon, Precambrian period

Encyclopedia: Proterozoic

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