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Calymmian - Palaeos (Site not responding. Last check: 2007-10-11) |
 | | The Calymmian (from Greek calymma, "cover") is the first geologic period in the Mesoproterozoic Era and lasted from 1600 Ma to 1400 Ma (million years ago). |
| | Instead of being based on stratigraphy, these dates are defined chronometrically. |
| | The supercontinent Columbia broke up during the Calymmian some 1500 Ma. |
| www.palaeos.org /Calymmian (93 words) |
