Paleozoic Earth ] Back | Next >

 North America
 280 million years ago

Mean atmospheric O2
 115% of modern level

Mean atmospheric CO2
 3x pre-industrial level

Mean temperature
 2C above modern level


Paleozoic Earth - Dimetrodon grandis portrait - Natural History Illustration Geologic Time Scale

 Era: Paleozoic
  Period: Permian
   Epoch: Cisuralian
    Age: Artinskian


Dimetrodon grandis portrait

An eleven-foot-long synapsid from the species Dimetrodon grandis traverses an Earth that became cooler and drier during the Early Permian period 280 million years ago.

Long before the reign of dinosaurs Dimetrodon emerged as the dominant land predator, a position they held for the next 20 million years. Contrary to their reptilian stance and dinosaur-like appearance, Dimetrodon are in fact more closely related to mammals, and hence to humans, than to dinosaurs or reptiles.



Copyright Walter B. Myers. All rights reserved.

Terms of use

Home | What's New | The Graphics | Information | Site Map |  ]