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 Ocean bottom
 480 million years ago

Mean atmospheric O2
 63% of modern level

Mean atmospheric CO2
 16x pre-industrial level

Mean temperature
 7C above modern level


Paleozoic Earth - Orthoceratites & trilobites on the bottom of an Ordovician sea 480 million years ago; Iapetus Ocean; Phoibic Ocean; Tornquist Sea; Paleoasiatic Ocean; Ural Ocean; Rheic Ocean - Natural History Illustration Geologic Time Scale

Era: Paleozoic
 Period: Ordovician
  Epoch: Early
   Age: Tremadocian


Orthoceratites & trilobites

Squid-like Orthoceratites (genus Orthoceras) attempt to make meals of trilobites of the species Asaphus kowalewskii at the bottom of an Ordovician sea 480 million years ago. Also featured is a sea star (AKA starfish), an echinoderm of the class Asteroidea; palm-like Crinoids (AKA sea lilies); Rugosa (AKA Tetracoralla); Favistina stellata coral; and Vauxia sponges. 



Copyright Walter B. Myers. All rights reserved.

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