Dr. Bob's Geologic Time Page
- Basic information about the geologic time scale and mnemonics to help remember the various periods and epochs.
- http://www.ux1.eiu.edu/~rbjorstad/geoltime.html

Fugue No. 16: G Minor
- Listen to the music piece while reading about how the geology and ecosystems of Grand Canyon, AZ are like a Bach fugue.
- http://jan.ucc.nau.edu/~tas3/wtc/ii16.html

Geological Time Line
- A simple chart provides links to further details of each era, and an interactive feature allows users to see global shifts and milestones.
- http://www.bobainsworth.com/fossil/timeline.htm

Life Through Geologic Time
- A pictorial history of life on Earth, with events and fossils linked from the relevant period or epoch.
- http://www.carlwozniak.com/earth/Life.html

Comprehending Geological Time
- An interactive tool to calculate time periods and human history in terms of different measurement scales such as a meter, a day or a million years.
- http://www.athro.com/geo/hgfr1.html

Web Geological Time Machine
- A simple table of the different time periods contains links to details of the rocks, fossils and locations of each one.
- http://www.ucmp.berkeley.edu/help/timeform.html

Earth Floor: Geologic Time
- Explains how the age of the earth is divided up into periods of time, and provides simple definitions and illustrations of the different names.
- http://www.cotf.edu/ete/modules/msese/earthsysflr/geotime.html