Image: NA basement rocks
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Description: Original image first published on Wikipedia 22 April 2005, since superseded by altered image; this one is being republished because altered image used colours too close to each other, and to accommodate those with visual difficulties
Title: NA basement rocks
Credit: This image is in the public domain in the United States because it only contains materials that originally came from the United States Geological Survey, an agency of the United States Department of the Interior. For more information, see the official USGS copyright policy.
Author: USGS
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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