Geologic Time Scale
Animation Source:
Earthguide
Scripps Institution of Oceanography
Questions for thought
- How old is the Earth?
- Why are the names of the time units before the Cambrian less familar?
- When did the dinosaurs disappar from the Earth?
Related resources
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GSA Geologic Time Scale
Printable version available.
The Geological Society of America
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Web Geological Time Machine
Description
UCMP, UC Berkeley
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Geologic Time
Description
by William L. Newman, USGS
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Geologic History of Southern California
Description
U.S. Geological Survey