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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 - Close-up of the face, eyes and antennae of a Phacops trilobite; trilobites; metazoans; Trilobitomorpha - Natural History Illustration Geologic Time Scale

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


Phacops face

Close-up of the face, eyes and antennae of a trilobite of the genus Phacops as it may have appeared 436 million years ago. The Phacops in this image is about six inches long.

A marine arthropod of the class Trilobita, Phacops is characterized by a rounded body with a globose head. Phacops, like most trilobites, had a pair of sophisticated compound eyes composed of hundreds of rigid, crystalline lenses.



Copyright Walter B. Myers. All rights reserved.

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