Permian

  1. Adjective.  (geology) Of a geologic period within the Paleozoic era; comprises the Cisuralian, Guadalupian and Lopingian epochs from about 280 to 248 million years ago.
  2. Proper noun.  (geology) The Permian period.

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This entry was last updated on RefTopia from its source on 3/20/2012.