USGS - science for a changing world

Geology and National Parks

 

Geology, Minerals, Energy and Geophysics Science Center home

The information found here reflects completed USGS work. The content of this page is static and has not been updated since the mid 2000's.

Geologic time scale

Geologic time scale Learn more about geologic time
Learn more about radiometric dating
How do we know the Age of the Earth?

Use your back button to return to previous page

Accessibility FOIA Privacy Policies and Notices

USA.gov logo U.S. Department of the Interior | U.S. Geological Survey
URL: http://geomaps.wr.usgs.gov/parks/gtime/timescale.html
Page Contact Information: G & G Webmasters
Page Last Modified: 25-Apr-2017@09:48