Definition of Paleopraterozoic

(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
(geology) the Paleoproterozoic era

- The Nuttall Encyclopedia

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The correct Spelling of this word is: Paleoproterozoic

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