460 mya - Eurypterids Appear 450 mya – Chondrichthyes 444 mya – Mass extinction

Eurypterids Appear “Sea Scorpion” Largest arthropod to ever live (2 meters or 6 feet long) Predator of the sea

Ostracoderms Jawless Fish Bony plated armor Cartilage “skeleton”

Mass Extinction marks the end of the Ordovician most likely due to glaciation of Gondwana…

Cephalopods Brachiopods Crinoids Ostracoderms

Gondwana Australia Africa Southern Europe Antarctica South America Gondwana gradually moved toward the South Pole until it covered the pole at the end of the period. Most of Gondwana was covered by water during the Ordovician. North America and Europe North America, Western Europe and Northern Europe were located in the tropics. These land areas were sometimes covered with water and sometimes not.

Were there terrestrial animals or plants? What would the land have looked like? Was all life found in the sea or marine environments? THERE WAS NO LIFE ON LAND STILL! Ordovician was the time where marine life diversified!