Dinopedia

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20 June 2014

  • curprev 20:3320:33, 20 June 2014Jacksonwarrier Message Wall contribs 446 bytes +446 Created page with "The Archean eon lasted from 4.0bya to 2.5bya.  During this time the atmosphere had little oxygen and the sun was only between 70% and 75% as bright as it is today.  The firs..."