Geologic Time Scale
Expandable geologic time scale
Click on Cenozoic, Mesozoic, and Paleozoic to expand.
Click on Cenozoic, Mesozoic, and Paleozoic to expand.
Related resources
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GSA Geologic Time Scale
Printable version available.
The Geological Society of America
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Geologic Time
Older online text but useful basic principles for students.
by William L. Newman, USGS