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Geology 105: History of Life
Geologic Time Scale
Help Maintain This Site

Help Maintain This Site

This Geologic Time Scale was originally designed for Spring 1998 "History of Life" course at San Francisco State University.

Since the site has wider appeal, I am trying to maintain and update it frequently. This is where you can help. If you have a page or website that should be included in this directory, please send email to In the email, please include the time period, a page title, location for the link (ie. General Info, Paleogeography, Fossils & Localities, etc), and the url of the link.

In the near future, I will be putting up a form to expedite the process.

Some of the links in the directory point to pages that were set up for specific earth science classes. These pages may have a limited lifetime on the web. As a result, you may find some broken links as you explore the Time Scale.

If you find a broken link, please send email to In the email, please list the Time Scale page url, and the link that is broken. I will try to fix broken links as quickly as possible.

If you have any other problems with the site, please send email to In the email, please list the time scale page url and the nature of the problem.


Updated: 4/15/99
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