Major Elements: Stream sediment chemistry median-values by bedrock lithology:

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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