Arizona Rocks to a new beat!


Granite 2 11-09-2010 Last river view Grand Canyon 8-17-2010

Geologic Time

Geologic TimeThe chart reflects the geologic time scale. Present day is at the top left column, earlier time on the right. The numbers on the right of each column are ages in millions of years.

Chart Credit: U.S. Geological Survey
Department of the Interior/USGS

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