Mean atmospheric O2
Geologic Time Scale
Nedoceratops under an Oak tree
Ceratopsid dinosaurs of the genus Nedoceratops (formerly known as Diceratops) graze beneath a giant tree of the genus Quercus (AKA Oak) 70 million years ago in what is today Wyoming. The ground birds on the right are from the predatory genus Avisaurus.
About the same size and weight of the three-horned Triceratops, Nedoceratops had only two prominent horns and a rounded stump where the nasal horn would be.
Oak trees emerged about 80 million years ago during the Late Cretaceous period.
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