Expert By SamK on December 02, 2023 Category(s)World and PlanetsTopic(s)Calymmian PeriodEarth PeriodsEarth1,600 M _ 1,400 M YearsThe time span of Calymmian period was 1,600 million years to 1,400 million years ago, while it's duration was approx. 200 million years.
