The Permian World

The Permian World - foraminiferans went completely extinct...

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The Permian World The Permian is geologically marked by the final assembly of Pangaea, glaciation in the souther extreme of Gondwana, and the greatest mass extinction in Earth history that occurred at the close of the Permian. The Permian world was marked by a nearly pole-to-pole supercontinent, Pangaea, that was surrounded by Panthalassa, the world sea. A small ocean, Tethys (today represented by the Mediterranean Sea) was also present.
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The Great Permian Extinction The end of the Permian, also the end of the Paleozoic era, was marked by the greatest extinction of the Phanerozoic eon. Despite its magnitude, the terminal Permian extinction has not received the amount of publicity or research that the more famous, but lesser, terminal Cretaceous extinction has. During the Permian extinction event, whose causes remain controversial, over 95% of marine species went extinct, while 70% of terresdtrial taxonomic familes suffered the same fate. The fusulinid
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Unformatted text preview: foraminiferans went completely extinct, as did the trilobites. Brachiopod genera declined from 60 to 10. The majority of extinctions seem to have occurred at low paleolatitudes, possibly suggesting some event involving the ocean. . Plants seem to have missed the great extinction. What floral changes occurred during the Permian occurred earlier in the period, when the gradual drying out of the continent led to the evolution and spread of better adapted "dry forms" such as gymnosperms and seed ferns to replace the swamp trees of the Carboniferous such as arborescent lycopods and sphenopsids. One major plant group disappeared, the swamp gymnosperm Cordaites . Table 1. Victims of the Permian extinction. fusulinid foraminifera trilobites rugose and tabulate corals blastoids acanthodians placoderms pelycosaurs...
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The Permian World - foraminiferans went completely extinct...

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