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The Calymmian Period (from , meaning 'cover') is the first geologic period in the Mesoproterozoic Era and lasted from to Mya (million years ago). Instead of being based on stratigraphy, these dates are defined Absolute dating.
The period is characterised by the expansion of existing , and by new platforms forming on basements that were recently .
The supercontinent of Columbia started to break up during the Calymmian some 1500 Mya. The Volyn biota have also been dated to 1500 Mya.
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