USGS National Geochemical Survey database

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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KML, uncompressed, 77M bytes
KMZ, compressed, 2.2M bytes

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http://mrdata.usgs.gov/cgi-bin/mapserv?map=ngs.map&request=GetCapabilities&service=WMS&version=1.1.1

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Get the entire data set

Shapefile with a subset of 53 attributes: ICP40, As, Se, Hg (63,810 samples, 5.2MB .ZIP package)
dBase file with all 286 attributes (66,613 records, 19.6MB .ZIP package)

Documentation:

National Geochemical Survey - Full documentation

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.

Metadata:

[Outline] - [Questions & Answers] - [Plain text]

About the database fields

Mineral Resources Eastern Central Western Alaska Minerals Information
Spatial Data Crustal Imaging & Characterization Other Mineral Related Links