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 306 million years ago

Mean atmospheric O2
 163% of modern level

Mean atmospheric CO2
 3x pre-industrial level

Mean temperature
 Same as modern level


Paleozoic Earth - Giant Meganeura (Meganeura monyi) flutter between Calamites and Asterophyllites (Calamitaceae) under a blue sky with a waxing crescent moon - Natural History Illustration Geologic Time Scale

 Era: Paleozoic
  Period: Carboniferous*
   Epoch: Late
    Age: Kasimovian


Calamites & Meganeura

Giant giant flying insects from the genus Meganeura--resembling and related to present-day dragonflies--flutter between arborescent (tree-like) horsetails of the genus Calamites and genus Asterophyllites in a Carboniferous scene from over 300 million years ago.

Now extinct, Calamites and Asterophyllites are related to today's horsetails, though they grew much larger. The Calamites resembled modern "Christmas tree" conifers, while the Asterophyllites looked somewhat like modern Thuja (arborvitae).

*AKA Carboniferous/ Pennsylvanian


Copyright Walter B. Myers. All rights reserved.

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