Factor Analysis Boxplots: Stream sediment chemistry by geologic province:

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                     Metal Factor 1:                                             Metal Factor 2:

                     [Fe₂O₃, Cu, Zn]                                                 [As, Pb]

            Major Factor 1:                      Major Factor 2:                    Major Factor 3:

       [Fe₂O₃, MgO, CaO]                      [K₂O, Al₂O₃]                          [Na₂O, CaO]

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Direct questions and comments to:

Gilpin R. Robinson

U.S. Geological Survey

Email grobinso@usgs.gov 

Phone (703)-648-6113