From the Geological Society of America. You are welcome to print off this pdf of the Geologic Time Scale.
U.S. Geological Survey The USGS is a science organization that provides impartial information on the health of our ecosystems and environment, the natural hazards that threaten us, the natural resources we rely on, the impacts of climate and land-use change, and the core science systems that help us provide timely, relevant, and useable information.
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