Mean atmospheric O2
Geologic Time Scale
Pterosaurs of the genus Zhenyuanopterus congregate on a bluff supporting redwood coniferous trees, ferns and Ginkgos 125 million years ago in what is today China.
With a wingspan of 12 feet and long needle-like teeth, Zhenyuanopterus was a carnivorous flying reptile that likely preyed upon aquatic life.
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