Paleoproterozoic

Paleoproterozoic
Of a geologic era within the Proterozoic eon; comprises the Siderian, Rhyacian, Orosirian and Statherian periods from about 2500 to 1600 million years ago, when cyanobacteria increased the amount of oxygen in the atmosphere and changed life on Earth for ever.
2. noun
The Paleoproterozoic era.

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  • Paleoproterozoic — The Paleoproterozoic (pronEng|ˌpeɪlɪoʊˌproʊtərəˈzoʊɪk, also spelled Palaeoproterozoic) is the first of the three sub divisions (eras) of the Proterozoic occurring between Ma|2500 |1600 . This is when the continents first stabilized. This is also… …   Wikipedia

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  • Superior craton — in the west. The western margin extends from northern Minnesota through eastern Manitoba to northwestern Ontario.The formation of the Superior craton is best explained within the context of 2.72 2.68 Ga accretion of small continental plates and… …   Wikipedia

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  • Wyoming craton — [ North American craton, also called Laurentia.] The Wyoming craton is located in the west central United States more specifically, in Montana, Wyoming, and parts of northern Utah. Also called the Wyoming province, it is the initial core of the… …   Wikipedia

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

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