Orosirian

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Proterozoic eon
2,500-542
Paleoproterozoic era
2,500-1,600
Mesoproterozoic era
1,600-1,000
Neoproterozoic era
1,000-542
Siderian
2,500-2,300
Rhyacian
2,300-2,050
Orosirian
2,050-1,800
Statherian
1,800-1,600
Calymmian
1,600-1,400
Ectasian
1,400-1,200
Stenian
1,200-1,000
Tonian
1,000-850
Cryogenian
850-630
Ediacaran
630-542

The Orosirian Period of the Paleoproterozoic Era:

2,050 to 1,800 Mya

Ingress here

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The Orosirian (from Greek orosira, "mountain range") is the third geological period in the Paleoproterozoic era and lasted from 2050 Ma to 1800 Ma (million years ago). Instead of being based on stratigraphy, these dates are defined chronometrically.

Latter half of the period was an episode of intensive orogeny on virtually all continents.

Probably during this period Earth's atmosphere changed to oxygen-rich due to photosynthesis by cyanobacteria.

Two of largest known impact events on Earth occurred during the Orosirian. At the very beginning of the period, 2023 Ma, a large asteroid collision created the Vredefort impact structure. The event that created the Sudbury Basin structure occurred near the end of the period, 1850 Ma.

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