1. From here, ocean floor turbidite deposits occurred in the Ordovician period . 2. These nektobenthic carnivores lived in the Ordovician period , from 478.6 to 449.5 Ma. 3. Cephalopods became dominant during the Ordovician period , represented by primitive nautiloids. 4. The Navatrasierra Shale Formation from the Ordovician period , is named after this town. 5. These nektobenthic carnivores lived in the Ordovician period , from 466.0 to 443.7 Ma. 6. Morphologically, the rhynchonellid has changed little since its appearance during the Ordovician period . 7. These nektobenthic carnivores lived in the Ordovician period , from 488.3 to 443.7 Ma. 8. Bryozoans have contributed to carbonate sedimentation in marine life since the Ordovician period . 9. In the late Ordovician period , Avalonia collided with Baltica creating the Tornquist Margin. 10. Siliclasitc and carbonate deposition continued through the Cambrian and into the Ordovician period .
