• (adjective): 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.
  • (proper-noun): The Paleoproterozoic era.

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Paleoproterozoic Era ( ;) is the first of the three sub-divisions (eras) of the Proterozoic Eon spanning 2,500 to 1,600 million years ago (2.5–1.6 Ga). It was during this era that the continents first stabilized.
Paleontological evidence on the Earth's rotational rate gave 20 hour days ~1.8 billion years ago, implying 450 days in a year.

Example Sentences

  • The lower Lesser Himalayan sequence: A Paleoproterozoic arc on the northern margin of the Indian plate

  • Increases in the overall maximum occurred in discrete steps approximately corresponding to increases in atmospheric oxygen levels in the mid-Paleoproterozoic and Ediacaran-Cambrian - early Ordovician.

  • The Sudbury impact layer in the Paleoproterozoic iron ranges of northern Michigan,

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