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        Summary 
        English: Map of world  geologic provinces
    Shield
             Platform
             Orogen
             Basin
             Large igneous province
            Extended continental  crust
          Oceanic crust:
            0–20  Ma
            20–65 Ma
            >65 Ma
         These geologic province maps depict only features approximately 150 km across and greater due to the fact that the resolution of the maps should be consistent with the resolution of the seismic refraction data.
 Source:  http://earthquake.usgs.gov/research/structure/crust/maps.php ; original upload english wikipedia 22 April 2005 by  SEWilco
 
        Licensing 
        
         
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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. 
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