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Proterozoic Tweet Definition of Proterozoic Like Definition of Proterozoic on Facebook
proper noun 
  1. (geology) The Proterozoic eon.
Translations: 
    adjective 
    1. (geology) Of, or relating to the geologic eon from about 2,500 to 570 million years ago; comprises the Paleoproterozoic, Mesoproterozoic and Neoproterozoic eras; marked by the build up of oxygen in the atmosphere and the emergence of primitive multicellular life.
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