National-scale geochemical analysis of stream sediments and soils in the US, from existing data, reanalysis of existing samples, and new sampling. Goal for sample density is one per 289 square km.
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geochem-fUS.kmz (compressed 2.2M bytes)
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https://mrdata.usgs.gov/services/geochem (WMS, version 1.3.0)
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|Shapefile||74,409 samples, 5.2MB .ZIP package||a subset of 53 attributes: ICP40, As, Se, Hg, excludes standards|
|dBase file||77,212 records, 19.6MB .ZIP package||all 287 attributes, includes standards|
|CSV file||77,212 records, 13MB .ZIP package||all 287 attributes, includes standards|
About the database tables and fields
All database fields, by category
Full documentation of the National Geochemical Survey
Complete report on the web including summaries of component datasets used to compile this resource, maps showing county-by- county average concentration of elements, and comprehensive explanations of the analytical methods.