2000. Lee M. Osmonson, USGS, Denver, CO (comp.). 
This shapefile includes arcs and  polygons that describe U.S. Geological
Survey defined geologic provinces of the World. Each province has a set o... U.S. Geological Survey.
    
  
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      2000. Lee M. Osmonson, USGS, Denver, CO (comp.), Feliks M. Persits, Contractor to USGS, Denver, CO (comp.), Douglas W. Steinshouer, Contractor to USGS, Denver, CO, and Timothy R. Klett, USGS, Denver, CO (comp.) and others. Geologic Provinces is a polygon theme representing  U.S. Geological Survey defined geologic provinces of the World. Each province has a set of geol... U.S. Geological Survey.