Mean atmospheric O2
Geologic Time Scale
Postosuchus on hilltop
A 12-foot-long, 1,000 pound rauisuchian archosaur of the genus Postosuchus wanders a hilltop 220 million years ago in what is today Texas. Surrounding the Postosuchus are various cycads, ferns, and tree-like Glossopteridales. With a crocodile-like body and tyrannosaur-like head, Postosuchus was likely a fierce apex predator that preyed upon Dicynodonts and other animals smaller than itself, including some of the first dinosaurs.
Copyright © Walter B. Myers. All rights reserved.
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