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Calymmian
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Calymmian
The Calymmian Period (from Ancient Greek: κάλυμμα, romanized: kálymma, meaning 'cover') is the first geologic period in the Mesoproterozoic Era and lasted from 1600 to 1400 Mya (million years ago). Instead of being based on stratigraphy, these dates are defined chronometrically.
The period is characterised by the expansion of existing platform covers, and by new platforms forming on basements that were recently cratonized.
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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Calymmian
The Calymmian Period (from Ancient Greek: κάλυμμα, romanized: kálymma, meaning 'cover') is the first geologic period in the Mesoproterozoic Era and lasted from 1600 to 1400 Mya (million years ago). Instead of being based on stratigraphy, these dates are defined chronometrically.
The period is characterised by the expansion of existing platform covers, and by new platforms forming on basements that were recently cratonized.
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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