Image: Geological time spiral
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Description: A diagram of the geological time scale
Title: Geological time spiral
Credit: Graham, Joseph, Newman, William, and Stacy, John, 2008, The geologic time spiral—A path to the past (ver. 1.1): U.S. Geological Survey General Information Product 58, poster, 1 sheet. Available online at http://pubs.usgs.gov/gip/2008/58/
Author: United States Geological Survey
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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