Calymmian
First period of the Mesoproterozoic Era
The Calymmian (from Ancient Greek: κάλυμμα, romanized: kálymma, meaning 'cover') is the first geologic period in the Mesoproterozoic Era, lasting from 1600 to 1400 million years ago (Ma) and spanning 200 million years. It follows the Statherian Period from the Paleoproterozoic Era, and precedes the Ectasian Period.
Nº Q876805 ★★★
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Calymmian
First period of the Mesoproterozoic Era
The Calymmian (from Ancient Greek: κάλυμμα, romanized: kálymma, meaning 'cover') is the first geologic period in the Mesoproterozoic Era, lasting from 1600 to 1400 million years ago (Ma) and spanning 200 million years. It follows the Statherian Period from the Paleoproterozoic Era, and precedes the Ectasian Period.
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From Wikipedia
The Calymmian (from Ancient Greek: κάλυμμα, romanized: kálymma, meaning 'cover') is the first geologic period in the Mesoproterozoic Era, lasting from 1600 to 1400 million years ago (Ma) and spanning 200 million years. It follows the Statherian Period from the Paleoproterozoic Era, and precedes the Ectasian Period. 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.
Text: Wikipédia, CC BY-SA 4.0. · Image: Sammy2012 (CC BY-SA 4.0) ·
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