Get the FREE one-click dictionary software for Windows
or the iPhone/iPad and Android apps
Noun: Proterozoic aeon
  1. From 2,500 to 544 million years ago; bacteria and fungi; primitive multicellular organisms
    - Proterozoic, Proterozoic eon

Type of: aeon, eon

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