Image:North america rock volcanic.jpg

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Four maps show the North American distribution of four principal types of rock: sedimentary, volcanic, plutonic and metamorphic rock.

Metamorphic rock

Plutonic rock

Sedimentary rock

Volcanic rock

North American terrain

North American rock types

Source

North America Tapestry of Time and Terrain. (USGS,GSC,COREMI)
North America Tapestry of Time and Terrain. ( USGS, GSC, COREMI)

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

Public domain 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 Interior. For more information, see the official USGS copyright policy

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