Educational Resources
History of the Earth Poster
International Stratigraphic Commission-CHRONOS poster with 2004 Geologic Time Scale and Tower of Time graphics [download 1.9 Mb]
Understanding Geologic Time
History and development of the Geologic Timescale Why is it needed? University of California, Berkeley Museum of Paleontology
GEOTIME a Smithsonian Institution's web resource on geologic time
Ancient Denvers from the Denver Museum of Nature and Science