Neoproterozoic

  1. Adjective.  (geology) Of a geologic era within the Proterozoic eon; comprises the Tonian, Cryogenian and Ediacaran periods from about 1000 to 544 million years ago, when algae and sponges flourished.
  2. Proper noun.  (geology) The Neoproterozoic era.

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