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 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 fracas (two Dimetrodon fighting) - Natural History Illustration Geologic Time Scale

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


Dimetrodon fracas

A pair of synapsids from the genus Dimetrodon fight over territory in a scene that must have been repeated many times 280 million years ago. Their spectacular sails are backlit revealing the translucent skin supported by long neural spines, each one sprouting from an individual vertebra. These Dimetrodon are each about 11 feet long. In the foreground are ferns and on the horizon on the right are seed ferns of the genus Alethopteris.



Copyright Walter B. Myers. All rights reserved.

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