Mean atmospheric O2
Geologic Time Scale
Estemmenosuchus mirabilis waterside
modern day hippopotami, three dinocephalian therapsids from the
species Estemmenosuchus mirabilis face off in a
Paleozoic lake 255 million years ago in what is
today the Perm region of Russia near the Ural Mountains. About the size
of a modern adult bull, Estemmenosuchus mirabilis was a plant-eating early
ancestor of today's mammals.
Copyright © Walter B. Myers. All rights reserved.
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