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Noun: Ordovician  ,or-du'vi-sh(ee-)un or ,or-du'vi-see-un
  1. From 500 million to 425 million years ago; conodonts and ostracods and algae and seaweeds
    - Ordovician period

Type of: geological period, period

Part of: Palaeozoic [Brit, Cdn], Paleozoic, Paleozoic era

Encyclopedia: Ordovician