The Proterozoic Eon
2.47 billion to 570 million years ago

 

Huronian Era 2.47 billion  to 2.22 billion years ago
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Animikean Era 2.22 billion to 1.67 billion years ago
  • 2.0 billion:  A dramatic increase in the planetary level of oxygen begins.

 

Riphean Era 1.67 billion to 825 million years ago

 

Sinian Era 825 million to 570 million years ago

 

 

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Contents © John M. and Margo L. Dollan 2003
Other usage cited at Usage Permission Page
This Page first uploaded December 15, 2003
Most recent update for this page December 15, 2003