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 410 million years ago

Mean atmospheric O2
 75% of modern level

Mean atmospheric CO2
 8x pre-industrial level

Mean temperature
 6C above modern level


Paleozoic Earth - Two Pteraspis jawless fish back-lit by the sun swimming near the surface of a Devonian sea 410 million years ago; Panthalassa; Panthalassic Ocean; Paleo Tethys Sea - Natural History Illustration

Geologic Time Scale

 Era: Paleozoic
  Period: Devonian
   Epoch: Early
    Age: Pragian


Pteraspis contre-jour

Two jawless fish of the genus Pteraspis feed near the ocean's surface 410 million years ago during the Early Devonian. Pteraspis grew to a length of about 8 inches and is believed to have dined on shoals of plankton. A hard shell and spikes may have helped to protect Pteraspis from larger predators.



Copyright Walter B. Myers. All rights reserved.

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