Mean atmospheric O2
Geologic Time Scale
Estemmenosuchus uralensis grazing
dinocephalian therapsid (a primitive mammal-like reptile) from the species
Estemmenosuchus uralensis grazes on a hilltop 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 uralensis was an early ancestor of
today's mammals, however it's not known whether Estemmenosuchus uralensis was warm blooded.
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