Understanding Our Planet Through Chemistry
Many maps, such as the map of lead in stream sediments of Colorado, are useful for both resource evaluations and environmental assessments.
This map of lead in Colorado stream sediments was generated with existing data from the National Geochemical Data Base. It shows the presence of a geochemical halo from the Colorado Mineral Belt and also the lead caused by industry in some cities. [20k]
Return to "IIIb. Geographic Chemistry: National Geochemical Data Base."
U.S. Department of the Interior |
U.S. Geological Survey
URL: http://minerals.cr.usgs.gov/gips/na/7process.html
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Page Last Modified: 07-May-2008@15:40
![[20k]](../images/co-lelrg.gif){kind=link}