Factor Analysis: Stream sediment median-value maps by population density:

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Metal Factors:  

                   Factor 1 [Fe₂O₃, Cu, Zn]:                         Factor 2 [As, Pb]:

Major Element Factors:

      Factor 1 [Fe₂O₃, MgO, CaO]           Factor 2 [K₂O, Al₂O₃]              Factor 3 [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