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Precambrian Eon > Proterozoic Era

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  • Introduction to the Proterozoic Era
    Period of Earth's history that began 2.5 billion years ago and ended 544 million years ago.
    www.ucmp.berkeley.edu/precambrian/proterozoic.html
  • Snowball Earth
    Snowball Earth investigated the neoproterozoic climate and describes the coldest global climate imaginable -- a planet covered by glacial ice from pole to pole.
    www.snowballearth.org
 



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