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#calymmian

Calymmian

First period of the Mesoproterozoic Era

The Calymmian Period is the first geologic period in the Mesoproterozoic Era and lasted from 1600 Mya to 1400 Mya. Instead of being based on stratigraphy, these dates are defined chronometrically.

Fri 14th

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Calymmian Mesoproterozoic Timeline of natural history Grandilingulata Algae Triassic Jurassic List of time periods Riphean (stage) Cretaceous
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