Major Elements: Stream sediment median-value maps, by hydrologic basin:

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                 Al₂O₃                                CaO                                       Fe₂O₃

                 K₂O                                     MgO                                         Na₂O

                 SiO₂                                        TiO₂

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Direct questions and comments to:

Gilpin R. Robinson

U.S. Geological Survey

Email grobinso@usgs.gov 

Phone (703)-648-6113