Expert By SamK on December 10, 2023 Category(s)World and PlanetsTopic(s)Orosirian PeriodEarth PeriodsEarth2,050 M - 1,800 M YearsThe time span of Orosirian period was 2,050 million years to 1,800 million years ago, while it's duration was approx. 250 million years.
