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

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Alkaline earths:

                                Ba                                                         Sr

First-row transition elements:

                                 Sc                                                       V

Heavy mineral suite (rare earths):

           Ce                               La                                Nd                            Ce/Yb(n)

Heavy mineral suite (other):

             Y                                  Th                                 U                               Zr

Base and toxic metals:

            Cu                                               Pb                                                Zn

               As                                                 Hg 

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Direct questions and comments to:

Gilpin R. Robinson

U.S. Geological Survey

Email grobinso@usgs.gov 

Phone (703)-648-6113