Explains how the age of the earth is divided up into periods of time, and provides simple definitions and illustrations of the different names.
A simple table of the different time periods contains links to details of the rocks, fossils and locations of each one.
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.
A pictorial history of life on Earth, with events and fossils linked from the relevant period or epoch.
A simple chart provides links to further details of each era, and an interactive feature allows users to see global shifts and milestones.
Listen to the music piece while reading about how the geology and ecosystems of Grand Canyon, AZ are like a Bach fugue.
Basic information about the geologic time scale and mnemonics to help remember the various periods and epochs.