The third period of the Paleoproterozoic era, spanning 2.05 billion to 1.8 billion years ago. Some of Earth's earliest global scale continent-continent collision belts developed during the Orosirian, building mountain ranges as early continental fragments assembled toward the supercontinent Columbia. This description is adapted from Wikipedia contributors under CC BY-SA 4.0; changes were made. https://creativecommons.org/licenses/by-sa/4.0/
Facts
Start (Million Years Ago) End (Million Years Ago) Orosirian
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Source Wikipedia: Vredefort impact structure, Wikipedia
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1. Paleoproterozoic (Wikipedia)
Wikimedia FoundationTable of Paleoproterozoic periodsQuote, Table of Paleoproterozoic periods
earliest global-scale continent-continent collision belts developed
Wikipedia: Vredefort impact structure, Wikipedia
Associated With: Vredefort Dome, Article text, age OrosirianQuote, Associated With: Vredefort Dome, Article text, age Orosirian
Estimates have placed the structure's age to be 2.023 billion years (± 4 million years) or 2.019/2.020 billion years (± 2-3 million years) old, which places it in the Orosirian Period of the Paleoproterozoic Era.
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