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  1. Category:Ordovician animals - Wikipedia

  2. Ordovician Period - Marine Life, Trilobites, Brachiopods | Britannica

  3. Ordovician Period - Natural History Museum

  4. Ordovician Period | Major Events, Extinction, & Facts | Britannica

  5. Ordovician Period: Facts, Information, and Timeline - A-Z Animals

  6. What are Some Ordovician Organisms? (with pictures)

  7. AtlasAtlas of Ordovician Life

  8. Ordovician - Wikipedia

  9. An Overview of the Flora and Fauna During the Ordovician Period

  10. Palaeos Paleozoic : Ordovician : The Ordovician Period