Orosirian
The Orosirian Period is the third geologic period in the Paleoproterozoic Era and lasted from Mya to Mya. Instead of being based on stratigraphy, these dates are defined chronometrically.
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 2017, this has not yet been officially adopted by the IUGS.Paleogeography
The supercontinent Columbia formed at the end of this period.
