Geologic Time Scale

Expandable geologic time scale
Click on Cenozoic, Mesozoic, and Paleozoic to expand.

Related resources

• GSA Geologic Time Scale
  Printable version available.
  The Geological Society of America
  
• Geologic Time
  Older online text but useful basic principles for students.
  by William L. Newman, USGS
  

© 2007-2008 Earthguide at Scripps Institution of Oceanography.
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