|Time span formality||Formal|
|Lower boundary definition||Defined chronometrically|
|Lower GSSA ratified||1991|
|Upper boundary definition||Defined chronometrically|
|Upper GSSA ratified||1991|
The Orosirian Period (
The later half of the period was an episode of intensive orogeny on virtually all continents.
Two of the largest known impact events on Earth occurred during the Orosirian. Early in the period, 2023 Mya, 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 Mya.
For the time period from about 2060 to 1780 Mya, an alternative period based on stratigraphy rather than chronometry, named the Columbian, was suggested in the geological timescale review 2012 edited by Gradstein et al.,
The supercontinent Columbia formed at the end of this period.
- "Orosirian Period". GeoWhen Database. Retrieved July 8, 2011.
- James G. Ogg (2004). "Status on Divisions of the International Geologic Time Scale". Lethaia. 37 (2): 183–199.
- ISBN 978-1-118-68812-0.
- ISBN 978-0-44-459390-0.