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 420 million years ago

Mean atmospheric O2
 70% of modern level

Mean atmospheric CO2
 16x pre-industrial level

Mean temperature
 3C above modern level


Paleozoic Earth - Ancient Silurian Gosslingia growing by the waterside; Tracheophyta; Lycophytina; Zosterophyllopsida - Natural History Illustration Geologic Time Scale

 Era: Paleozoic
  Period: Silurian
   Epoch: Ludlow/Cayugan
    Age: Ludfordian



Silu-Devonian land plants with branching axes of the genus Gosslingia populate the surface of an ancient Earth. Growing barely 12 inches high, these earliest land plants may have encouraged pioneering vertebrates to emerge from the water in search of food.



Copyright Walter B. Myers. All rights reserved.

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