Mesozoic Earth ] Back | Next >

 North America
 160 million years ago

Mean atmospheric O2
 130% of modern level

Mean atmospheric CO2
 7x pre-industrial level

Mean temperature
 3C above modern level

Mesozoic Earth - Camptosaurus grazing in a Jurassic forest of cycads and ferns; Ornithischia; herbivores; Late Jurassic; Upper Jurassic; Oxfordian; pterosaurs - Natural History Illustration Geologic Time Scale

 Era: Mesozoic
  Period: Jurassic
   Epoch: Late
    Age: Oxfordian



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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