Ausome Auriculatus Shark tooth found by Kirk of @lostworldexcavations in a Florida river! There have been hundreds of trips over years for this rare, but occasionally possible situation of a beautiful fossil sitting out on the surface. Anything is possible at a marine fossil exposure and these rivers are great at exposing them. . Auriculatus sharks were an ancient ancestor of the Megalodon. Their cusps are very prominent and their serrations are very course. They are still “mega toothed” sharks,