Mean atmospheric O2
Geologic Time Scale
Plant-eating ornithischian dinosaurs of the genus Camptosaurus graze in a forest of cycads and ferns 160 million years ago in what is today Wyoming. In the cloudy sky above a pair of pterosaurs soar by.
Adult Camptosaurus grew to 26 feet long, nearly seven feet tall at the hip, and weighed over 1,500 pounds. These dinosaurs had sturdy beaks in addition to closely packed teeth which would have helped them to dine on tough Jurassic vegetation.
Copyright © Walter B. Myers. All rights reserved.
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