Paleozoic Earth ] Back | Next >

 290 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 - Diplocaulus swimming near the bottom of a fresh water lake; Cisuralian Permian; - Natural History Illustration

Geologic Time Scale

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



A pair of three-foot-long leponspondyl amphibians of the genus Diplocaulus swim near the bottom of a fresh water Early Permian lake 290 million years ago in what is today Texas. Diplocaulus is recognized for its large, boomerang-shaped head. With no known counterpart today, the purpose of Diplocaulus' head is not clear. It may have helped it to swim, and/or its bony head may have made it difficult for larger marine predators to swallow.



Copyright Walter B. Myers. All rights reserved.

Terms of use

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