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Orosirian

Hierarchy:Precambrian Proterozoic  Paleoproterozoic
   Orosirian
Classification:Period (as per International Commission on Stratigraphy)
Top:1800 Ma
Base:2050 Ma
Preceeds:Statherian
Follows:Rhyacian
Name origin:From the Greek: ὀροσειρά (oroseirá), meaning "mountain range."
GSSP:Defined chronometrically
The atmosphere becomes oxygenic.

Vredefort and Sudbury Basin asteroid impacts.

Much orogeny. Penokean and Trans-Hudsonian Orogenies in North America.

Early Ruker Orogeny in Antarctica, 2000–1700 Ma.

Glenburgh Orogeny, Glenburgh Terrane, Australian continent c. 2005–1920 Ma.

Kimban Orogeny, Gawler craton in Australian continent begins.
 

Geologic Events

Event NameTypeAgeArea
Sudbury impactImpact Event1850 ± 3 MaSudbury, Ontario
Early Ruker orogeny (begins)Orogeny2000 - 1700 MaAntarctica
Svecofennian orogeny (concludes)Orogeny~2000 - ~1750 MaEurope
Vredefort impactImpact Event2023 ± 0.004 MaFree State Province, South Africa
Columbia (Nuna) supercontinent assembly (ongoing)Continental Assembly2125 ± 125 - 1780 ± 70 MaGlobal
Eburnean orogeny (concludes)Orogeny~2200 - ~2000 MaWest Africa
Great Oxygenation Event (concludes)Major Climatic Event~3500 - ~850 MaGlobal


Overview of geological time

List all geological events
Mineral and/or Locality  
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