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December 2005

Geologic Time: The Story of a Changing Earth
Elegant site presents our planet's eons, eras, periods, and epochs.
Grade Level: 6-8, 9-12

The Paleobiology Department at The Smithsonian National Museum of Natural History developed this site to provide an interactive timeline of geological history.
This site is elegantly designed and can be navigated in a variety of ways. Visitors can use the drag tool on the timeline to choose the eon, era, period or epoch and then click on the section of choice or use the drop down menu at the top of the page to jump directly to a segment. The various pages have a left side menu for moving through the sections. Macromedia Flash Player is needed for the Flash version but a HTML version is also available.

The Story of a changing Earth explores the history of geology from the Hadean eon to the present day. The interactive timeline allows users to use a drag tool to move to the eon, era, period or epoch of choice and then click on the icon to bring up an overview of the segment with embedded links to more information, pictures and information about the fossil evidence and the conditions of the earth at the time. The Foundational Concepts area explains the importance of the different dating methods and an introduction to earth processes and life processes. Included are references and related links and a glossary.


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