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 400 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 - Asteroxylon swamp in twilight from the Early Devonian period - Natural History Illustration Geologic Time Scale

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


Asteroxylon swamp

Asteroxylon was a genus of the division Lycopodiophyta, primitive plants that flourished during the Early Devonian period approximately 400 million years ago. They grew as tall as 8 feet and lived in warm, humid environments.



Copyright Walter B. Myers. All rights reserved.

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