Many species were alive 60 million years ago or longer. Coelocanth, horseshoe crabs, alligator gar, I think the sturgeon has been around a long time, and of course sharks and some reptiles - crocodiles and alligators. Birds, especially their scaled legs and claws, show their genetic heritage. Some posit that many dinosaurs had feathers - like the raptors and the like from which birds are descended. Then there the carvings in Ankor Wat in Camdodia of a stegosaurus. That was built in the 15th? century. And there's some stones been found in Mexico with many carvings of dinosaurs on them, though many say they're fake.