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The Calymmian (from Greek calymma, "cover") is the first geologic period in the Mesoproterozoic Era and lasted from 1600 Mya to 1400 Mya (million years ago).
Greek alphabet, Greece, Cyprus, Armenia, Christianity
Period (geology), Paleogene, Neogene, Paleoproterozoic, Neoproterozoic
Period (geology), Paleogene, Neogene, Precambrian, Paleoproterozoic
Earth, Bacteria, Period (geology), Paleogene, Neogene