Image: Stratigraphy of the Grand Canyon
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Description: Stratigraphy of the Grand Canyon
Title: Stratigraphy of the Grand Canyon
Credit: http://www.nature.nps.gov/geology/parks/grca/age/image_popup/yardstickstratcolumn.png
Permission: PD-USGov, see below and http://www.nps.gov/disclaimer.htm
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
Image usage
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