Mean atmospheric O2
Geologic Time Scale
Parasaurolophus and waterfall
A pair of 3 ton plant-eating ornithopod dinosaurs of the genus Parasaurolophus dine on flora near a waterfall 75 million years ago in North America. Similar to plant-eating Lambeosaurus of the same period, these dinosaurs also sported a distinctive hollow cranial crest.
Copyright © Walter B. Myers. All rights reserved.
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