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Proterozoic |
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Proterozoic [¦präd·ə·rə¦zō·ik] (geology) Geologic time between the Archean and Paleozoic eras, that is, from 2500 million to 550 million years ago. Also known as Algonkian. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| The new extinction mechanism of hydrogen sulfide releases might also have prevented life from making the evolutionary jump onto land during the Proterozoic period 0. 65 Mesozoic Createous Jurassic Triassic 248 Paleozoic Permian Carboniferous Devonian Silurian Ordovician Cambrian 543 Late Ediacaran NEWCOMER: Proterozoic Cryogenian The new period stretches from 600 to 544 million years ago. Those of Paleozoic and Proterozoic age are usually more deeply eroded, and consist of flood basalt remnants and a deep-level plumbing system (of giant dyke swarms, sill provinces and layered intrusions). |
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