Calymmian


Calymmian
of a geologic period within the Mesoproterozoic era from about 1600 to 1400 million years ago
2. noun
the Calymmian period

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  • Calymmian — 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… …   Wikipedia

  • Mesoproterozoic — era 1600   1000 million years ago Key events in the Mesoproterozoic view • edit …   Wikipedia

  • Geologic time scale — This clock representation shows some of the major units of geological time and definitive events of Earth history. The Hadean eon represents the time before fossil record of life on Earth; its upper boundary is now regarded as 4.0 Ga.[1] Other… …   Wikipedia

  • Neoproterozoic — era 1000   542 million years ago Key events in the Neoproterozoic view • edit …   Wikipedia

  • Cryogenian — Period 850–630 million years ago …   Wikipedia

  • Orosirian — The Orosirian (  /ˌɒrɵˈ …   Wikipedia

  • Geology of the North Sea — Contents 1 Tectonic structure 2 Precambrian 3 Finnmarkian, Athollian, Caledonian Orogenies …   Wikipedia

  • Cambrian — For other uses, see Cambrian (disambiguation). Cambrian Period 542–488.3 million years ago …   Wikipedia

  • Carboniferous — For the album by Zu see Carboniferous (album). Carboniferous Period 359.2–299 million years ago …   Wikipedia

  • Cretaceous — Period 145.5–65.5 million years ago …   Wikipedia