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slate was quarried for hundreds of years and is still quarried today up to 38 feet in depth
Unlike many other oviraptorids
but not the scales of the cone
with full adulthood being reached at 36 months
Parasaurolophus walkeri, left lower jaw (juvenile) hadrosaur Pteranodon slate was quarried for hundredsParasaurolophus 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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