Factor Analysis Boxplots: Stream sediment chemistry by population density:

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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