Prehistoric Ordovician Hallettestoneion Seazoria Dragons Discovery. Exclusive Access into one of the single most significant prehistoric biological discoveries in history. Sea Dragons are now scientific fact. Note: Seazoria Dragons extinct 484 million years ago, DO NOT LOOK LIKE DINOSAURS. THERE WERE NO DINOSAURS IN THE ORDOVICIAN SEAZORIA DRAGONS TIME ERA. Seazoria Dragons are examples of Cartilage (not having a bone skeleton) Advanced Marine Biology (Reptiles). The primary surviving Seazoria Dragons Biological Remains are the Skull, the Teeth and the Body Spikes.