Cryogenian
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Cryogenian — Period 850–630 million years ago … Wikipedia
Geology of Tasmania — Tasmania has a varied geological history, with the world s biggest exposure of diabase, or dolerite. Rocks from the Neoproterozoic, Paleozoic and Mesozoic time periods appear. It is one of the few southern hemisphere areas glaciated during the… … Wikipedia
Snowball Earth — The Snowball Earth hypothesis as it was originally proposedcite book author = Kirschvink, J.L. year = 1992 chapter = Late Proterozoic low latitude global glaciation: The snowball Earth title = The Proterozoic Biosphere: A Multidisciplinary Study… … Wikipedia
Marinoan glaciation — Neoproterozoic Snowball Periods 1000 – … Wikipedia
Neoproterozoic — era 1000 542 million years ago Key events in the Neoproterozoic view • edit … Wikipedia
Ice age — An ice age is a period of long term reduction in the temperature of the Earth s surface and atmosphere, resulting in an expansion of continental ice sheets, polar ice sheets and alpine glaciers. Glaciologically, ice age is often used to mean a… … Wikipedia
Testate amoebae — (Protozoa: Rhizopods) are single celled protists partially enclosed in a simple test (shell). [ http://www.microscopy uk.org.uk/mag/artjun03/gsamoebae.html Testate amoebae, peat bogs and past climates. accessed 16 march 2007] Other names for the… … 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
Precambrian — For the album by German band The Ocean, see Precambrian (album). Precambrian Period 4567.17–542 million years ago … Wikipedia
Modern evolutionary synthesis — Evolutionary theory redirects here. For the sociological theory, see sociobiology. Part of a series on Evolutionary Biology … Wikipedia
