Mean atmospheric O2
Geologic Time Scale
12-foot-long 500 pound dinocephalian therapsids of the genus Jonkeria pause in a shallow stream in a dry mid-Permian landscape 262 million years ago in what is today South Africa. Vegetation includes various ferns.
Jonkeria was large mammal-like reptile with a stout pig-like build. Paleontologists haven't been able to determine whether Jonkeria was an herbivore, carnivore, or possibly like modern pigs an omnivore.
Copyright © Walter B. Myers. All rights reserved.
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