Parasaurolophus walkeri, left lower jaw (juvenile) hadrosaur Pteranodon Unlike many other oviraptorids

Unlike many other oviraptorids

but not the scales of the cone

Jefferson thought they were the claws of a giant cat

A complete tooth with root could be over 12 inches long

slate was quarried for hundreds of years and is still quarried today up to 38 feet in depth

Parasaurolophus walkeri, left lower jaw (juvenile) hadrosaur Pteranodon Unlike many other oviraptoridsParasaurolophus was a long crested, duck billed (hadrosaur) dinosaur. Its extremely long, backwards leaning, hollow, bony crest was as bigger than the rest of its skull and may have been used to produce a low frequency, foghorn like sound, enhance its sense of smell, and or used in courtship displays. The Parasaurolophus' nostrils (at the end of its snout) went up through the crest and back down it, forming four tubes. The crest was up to 6 feet (1. 8