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Paleoproterozoic Tweet Definition of Paleoproterozoic Like Definition of Paleoproterozoic on Facebook
proper noun 
  1. (geology) The Paleoproterozoic era.
adjective 
  1. (geology) Of a geologic era within the Proterozoic eon; comprises the Siderian, Rhyacian, Orosirian and Statherian periods from about 2500 to 1600 million years ago, when cyanobacteria increased the amount of oxygen in the atmosphere and changed life on Earth for ever.
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