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 415 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 - Aglaophyton populate an Early Devonian bay; paleobiology; paleobotany; Lochkovian stage; Pragian stage - Natural History Illustration Geologic Time Scale

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


Aglaophyton bay

Thousands of individual pre-vascular, axial, free-sporing land plants of the genus Aglaophyton populate an Early Devonian bay (in this case the remains of an already ancient crater) 415 million years ago.

Standing about 10 inches tall, Aglaophyton consisted of simple, branching stalks topped with sporangia. The sporangia, here colored red, held spores for reproduction. (Note that the colors are only a guess as these early terrestrial plants long ago became extinct during the Middle Devonian.) Instead of roots, these simple plants had horizontal stems with fibrous rhizoids that may have drawn moisture and nutrients from the soil with the aid of mycorrhizal fungi.



Copyright Walter B. Myers. All rights reserved.

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