ordovician ordovician

Definition(s):

  • (n) from 500 million to 425 million years ago; conodonts and ostracods and algae and seaweeds

News

  • Researchers Explain Story Of Ancient Invasive Species In North America

    Brett Smith for redOrbit.com - Your Universe Online A new study from researchers at Ohio State University tells the story of an invasion and domination that took place around 450 million years ago in North America. During the Ordovician period , a dramatic ecological shift occurred near what are now the Appalachian Mountains, as represented in the fossil record. In the study , which was ...
    on August 22, 2013     Source: redOrbit

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nebulous nebulous
/ˈnɛb jə ləs /