Graphical Representation of Geologic Time

United States Geological Survey

This page has an illustration of the 4.5 billion year old Earth's time scale shown as a spiral with pictorial representations of both marine and terrestrial life. The text discusses how the age of the Earth is determined. The illustration is from the USGS General Interest Publication, Geologic Time by William L. Newman.

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Grade Level: General Public
Topics: Time/Earth History