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Calymmian The Calymmian (from Greek ''calymma'', "cover") is the first geologic period in the Mesoproterozoic Era and lasted from Mya to Mya (million years ago). Instead of being based on stratigraphy, these dates are defined chronometrically. The period is characterised by expansion of existing platform covers, or by new platforms on recently cratonized basements. The supercontinent Columbia broke up during the Calymmian some 1500 Mya. ==See also==
*Jotnian
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Calymmian」の詳細全文を読む
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