Dunkleosteus skull at the Cincinnati Museum of Natural History Way before even your great-great-grandpappy was born and Ohio was ocean instead of cornfields, it was the “Age of the Fishes”. During this Devonian (400-360 million years ago), the placoderms, giant, shark-like, armored fishes, ruled the oceans. Among the largest and most fearsome of these were . . . → Read More: Easy Big Fella