What is Calymmian?
The '''Calymmian''' is the first [[geology|geological]] [[Period (geology)|period]] in the [[Mesoproterozoic]]. It began 1.6 [[billion]] years ago and ended at 1.4 billion years ago. In the period new land was formed. The supercontinent [[Columbia (continent)|Columbia]] broke up during the Calymmian about 1.5 billion years ago. {{Geologic history}} {{Science-stub}} [[Category:Mesoproterozoic]]