File:North america rock types.jpg
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Rock type maps for the North America Tapestry of Time and Terrain map.
Four smaller maps show the distribution of four principal types of rock: sedimentary, volcanic, plutonic and metamorphic.
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Metamorphic rock
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Plutonic rock
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Sedimentary rock
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Volcanic rock
Source
Home: http://pubs.usgs.gov/imap/i2781/
Image: http://pubs.usgs.gov/imap/i2781/i2781_c_low.pdf 144 dpi, encoded to 72 dpi JPEG, compressed slightly to fit within Wikipedia 2MB limit.
Source: English Wikipedia, original upload 15 April 2005 by SEWilco
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This image is in the public domain because it 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. български | català | Deutsch | English | español | eesti | suomi | français | galego | italiano | 한국어 | македонски | മലയാളം | Nederlands | polski | português | русский | Türkçe | 中文（香港） | 中文（简体） | +/− |
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