Mesozoic Earth ] Back | Next >

 North America
 68 million years ago

Mean atmospheric O2
 150% of modern level

Mean atmospheric CO2
 6x pre-industrial level

Mean temperature
 4C above modern level

Mesozoic Earth - A furry Tyrannosaurus rex wanders among Cretaceous oak trees and ground ferns; theropod; bipedal carnivore; apex predator; scavenger; tyrannosaurid; T-Rex; T. rex; King of the Dinosaurs - Natural History Illustration Geologic Time Scale

 Era: Mesozoic
  Period: Cretaceous
   Epoch: Late
    Age: Maastrichtian


Tyrannosaurus rex

A 40 foot long, seven ton coelurosaurian theropod dinosaur of the species Tyrannosaurus rex wanders among oak trees and ground ferns 68 million years ago on a Cretaceous island continent known as Laramidia in what is today the western United States.

This example of Tyrannosaurus rex hosts fur-like downy feathers on its head, back and along the top of its tail. While it's not known whether Tyrannosaurus rex was feathered, other tyrannosaur fossils have shown tantalizing evidence of them.

On the lower left is a rodent-size proto-primate of the genus Purgatorius, and in the lower middle is an amphibious tetrapod of the family Salamandridae.




Copyright Walter B. Myers. All rights reserved.

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