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Palaeozoic

A Dictionary of Zoology | 1999 | | Â© A Dictionary of Zoology 1999, originally published by Oxford University Press 1999. (Hide copyright information) Copyright

Palaeozoic (Paleozoic) The first of the three eras of the Phanerozoic, about 542–251 Ma ago. The Cambrian, Ordovician, and Silurian Periods together form the Lower Palaeozoic Sub-Era; the Devonian, Carboniferous, and Permian the Upper Palaeozoic Sub-Era. The faunas of the Palaeozoic are noted for the presence of many invertebrate organisms including Trilobitomorpha, Graptolithina, Brachiopoda, Cephalopoda, and corals. By the end of the era, amphibians and reptiles were major components of various communities and giant tree-ferns, horsetails, and cycads gave rise to extensive forests.

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MICHAEL ALLABY. "Palaeozoic." A Dictionary of Zoology. 1999. Encyclopedia.com. 28 Nov. 2009 <http://www.encyclopedia.com>.

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