Stratigraphy_of_the_Grand_Canyon.png
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Summary
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| Description |
Stratigraphy of the Grand Canyon. "Grand Canyon 'yardstick' of geologic time: A guide to the canyon’s geologic history and origin." |
| Source | https://www.nps.gov/articles/images/pop-up-yardstick.jpg |
| Author | Mathis, A. 2006. Grand Canyon Association, Grand Canyon, Arizona, USA. |
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Permission
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PD-USGov, see below and http://www.nps.gov/disclaimer.htm |
Licensing
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This image or media file contains material based on a work of a United States Department of the Interior employee, created as part of that person's official duties. As a work of the U.S. federal government , such work is in the public domain in the United States. See the Department of the Interior copyright policy for more information. |
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