Hadean

  1. Adjective.  (geology) Of, or relating to the geologic eon from about 4,600 to 3,800 million years ago; marked by the formation of the solar system, a stable Earth-Moon orbit and the first rocks.
  2. Noun.  (geology) The Hadean eon.

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