| 1. | The Ordovician was the first of five great extinctions in history.
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| 2. | The Great Ordovician Biodiversification Event considerably increased the diversity of life.
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| 3. | Eganville is also known as the Ordovician Fossil Capital of Canada.
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| 4. | This slate is of volcanic ash origin and of Ordovician date.
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| 5. | The basalt intrudes through the Ordovician Beekmantown Group of carbonate rocks.
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| 6. | This genus is known from the Ordovician to the Permian periods.
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| 7. | Discosorids ranged from the Middle Ordovician possibly to the Upper Devonian.
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| 8. | The prevalent geological make up is of Ordovician or Cenozoic sediments.
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| 9. | The lower Ordovician Aydos Formation conformably overlies the So ! uksu.
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| 10. | It lived during the Ordovician ( upper Tremadoc to Ashgill ).
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