Factor Analysis: Stream sediment chemistry median-value maps by hydrologic basin:

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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