Calymmian Period

The Calymmian Period is a geological period from 1600 to 1400 million years ago, and the earliest period of the Mesoproterozoic Era. During the Calymmian, the supercontinent Columbia broke up.

Adjacent Periods
The Calymmian Period was preceded by the Statherian Period of the Paleoproterozoic Era, and succeeded by the Ectasian Period.