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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.
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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