File:Stratigraphy of the Grand Canyon.png

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DescriptionStratigraphy of the Grand Canyon.png	Stratigraphy of the Grand Canyon
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Source	http://www.nature.nps.gov/geology/parks/grca/age/image_popup/yardstickstratcolumn.png
Author	This file is lacking author information.
Permission ( Reusing this file)	PD-USGov, see below and http://www.nps.gov/disclaimer.htm

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This image is a work of the United States Department of the Interior, taken or made as part of that person's official duties. As a work of the U.S. federal government, the image is in the public domain.

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