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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.
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Basic information about the geologic time scale and mnemonics to help remember the various periods and epochs.
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Listen to the music piece while reading about how the geology and ecosystems of Grand Canyon, AZ are like a Bach fugue.
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A kid-friendly explanation of deep time.
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A simple chart provides links to further details of each era, and an interactive feature allows users to see global shifts and milestones.
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A pictorial history of life on Earth, with events and fossils linked from the relevant period or epoch.
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Geologic time scale with links for each time interval.
