- Douglas Henderson's Earth History Illustrations
 - Gallery of scientific illustrations representing Earth's ancient life, landscapes, dinosaurs, and prehistoric creatures. Includes illustrated geologic timeline. - Earth Sciences Explorer: Geologic Time
- Learn about the many exciting things that happened during the different time segments.
- Geologic Ages of Earth History
- Table denotes when dinosaurs existed, and may be downloaded as an Excel worksheet.
- Geologic Time
- Online version of a U.S. Geological Survey publication.
- Geologic Time: The Story of a Changing Earth
- Learn about the characteristics that define each eon, how the Earth's crust and atmosphere were formed, what the Earth's physical processes are, and how a rock's age is determined.
- Geological Evolution of the Earth, The
- Presents in a vertical time line images of the Earth's geologic evolution from 510 million years ago to the present.
- Palaeos: The Trace of Life on Earth
- Dedicated to providing detailed information on the history of life on Earth. Addresses palaeontology, evolution, geochronology, systematics, and ecology.
- Tapestry of Time and Terrain: The Union of Two Maps
- USGS composite map of the U.S. land surface and the ages of its underlying rock formations.
- Web Geological Time Machine
- Introduction to geology and geologic time periods. Information on recoginzing eras in time, from the Vendian to the Holocene.
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