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There are vertical and horizontal hangers on the back
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
Jefferson thought they were the claws of a giant cat
A complete tooth with root could be over 12 inches long
Parasaurolophus walkeri, left lower jaw (juvenile) hadrosaur Pteranodon There are vertical and horizontalParasaurolophus 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
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