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with full adulthood being reached at 36 months
slate was quarried for hundreds of years and is still quarried today up to 38 feet in depth
A definitive explanation for their mass extinction is yet to be agreed upon
There are vertical and horizontal hangers on the back
Parasaurolophus walkeri, left lower jaw (juvenile) hadrosaur Pteranodon with full adulthood being reachedParasaurolophus 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