| 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. |
| Dr. Bob's Geologic Time Page: Basic information about the geologic time scale and mnemonics to help remember the various periods and epochs. |
| 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. |
| 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. |
| 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. |
| Life Through Geologic Time: A pictorial history of life on Earth, with events and fossils linked from the relevant period or epoch. |
| 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. |
Classical
