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 436 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 - Six inch long Phacops trilobites on an ocean bottom; trilobite; metazoans; Trilobitomorpha - Natural History Illustration Geologic Time Scale

 Era: Paleozoic
  Period: Silurian
   Epoch: Llandovery
    Age: Telychian


Phacops trilobites in a Silurian sea

Trilobites of the genus Phacops scurry across the sandy bottom of a Silurian sea 436 million years ago. Also in this image are branching sponges from the genus Vauxia.

Phacops is a marine arthropod of the class Trilobita. It is characterized by a rounded body with a globose head. The Phacops in this image are about six inches long.



Copyright Walter B. Myers. All rights reserved.

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