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Description: The USGS, in collaboration with other federal and state government agencies, industry, and academia, is conducting the National Geochemical Survey (NGS) to produce a body of geochemical data for the United States based primarily on stream sediments, analyzed using a consistent set of methods. These data will compose a complete, national-scale geochemical coverage of the US, and will enable construction of geochemical maps, refine estimates of baseline concentrations of chemical elements in the sampled media, and provide context for a wide variety of studies in the geological and environmental sciences. The goal of the NGS is to analyze at least one stream-sediment sample in every 289 km2 area by a single set of analytical methods across the entire nation, with other solid sample media substituted where necessary. The NGS incorporates geochemical data from a variety of sources, including existing analyses in USGS databases, reanalyses of samples in USGS archives, and analyses of newly collected samples. At the present time, the NGS includes data covering ~71% of the land area of the US, including samples in all 50 states. This version of the online report provides complete access to NGS data, describes the history of the project, the methodology used, and presents preliminary geochemical maps for all analyzed elements. Future editions of this and other related reports will include the results of analysis of variance studies, as well as interpretive products related to the NGS data. This database provides in digital form many geochemical analyses reported by USGS in its published literature.

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Copyright Text: Jeffrey N. Grossman: Principal author of this report; database design and data processing; development of geochemical mapping methods; development of computer methods in support of geochemical sampling. Andrew E. Grosz: Project concept, design, and leadership; development and supervision of sampling protocols and field methods; development of collaborative activities between the USGS and other agencies. Peter N. Schweitzer: Development of data retrieval software; website programming. Paul G. Schruben: GIS support; report generation; sample site maps; sample preparation.

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