Great Ordovician Biodiversification Event
![Possible line of meteors associated with the Middle Ordovician meteor event on the modern globe. Although this is suggestive of a single large meteorite shower, the exact alignment of continental plates 470 million years ago is unknown and the exact timing of meteors is also unknown.](/Images/godic/202501/15/Ordovician_meteor_world2131.jpg")
![Atrypid brachiopods (Zygospira modesta) preserved in their original positions on a trepostome bryozoan; Cincinnatian (Upper Ordovician) of southeastern Indiana.](/Images/godic/202501/15/ZygospiraAttached2131.jpg")
The Great Ordovician Biodiversification Event (GOBE or Ordovician radiation) was a evolutionary radiation of animal life throughout the Ordovician period, 40 million years after the Cambrian explosion, whereby the distinctive Cambrian fauna fizzled out to be replaced with a Palaeozoic fauna rich in suspension feeder and pelagic animals.