Orosirian
Third period of the Paleoproterozoic Era
Orosirian
The Orosirian ( ; Ancient Greek: ὀροσειρά, romanized: oroseirá, meaning "mountain range") is the third geologic period in the Paleoproterozoic Era. It spans 250 million years and lasted from 2050 to 1800 million years ago (Ma), following the Rhyacian Period and preceding the Statherian Period. Instead of being based on stratigraphy, these dates are defined chronometrically.
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