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Orosirian

Orosirian
Chronology
Etymology
Name formalityFormal
Usage information
Celestial bodyEarth
Regional usageGlobal (ICS)
Time scale(s) usedICS Time Scale
Definition
Chronological unitPeriod
Stratigraphic unitSystem
Time span formalityFormal
Lower boundary definitionDefined chronometrically
Lower boundary GSSPN/A
GSSP ratifiedN/A
Upper boundary definitionDefined chronometrically
Upper boundary GSSPN/A
GSSP ratifiedN/A

The Orosirian Period (/ˌɒroʊˈsɪəriən/; Ancient Greek: ὀροσειρά, romanizedoroseirá, meaning "mountain range") is the third geologic period in the Paleoproterozoic Era and lasted from 2050 Mya to 1800 Mya (million years ago). Instead of being based on stratigraphy, these dates are defined chronometrically.

Vredefort impact structure is believed to have formed in this 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., but as of February 2022, this has not yet been officially adopted by the IUGS.

Paleogeography

Orosirian continents.jpg

The supercontinent Columbia formed at the end of this period.


This page was last updated at 2022-11-17 08:24 UTC. Update now. View original page.

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