Geochemistry of soils from the National Geochemical Database. Primarily inorganic elemental concentrations, most samples are from the continental US and Alaska.
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Show in Google Earth or other KML viewer:
ngdbsoil.kml (uncompressed 65 Mbytes)
ngdbsoil.kmz (compressed 2.4 Mbytes)
Show in your GIS using OGC web services:
https://mrdata.usgs.gov/services/ngdbsoil (WMS, version 1.3.0)
https://mrdata.usgs.gov/services/wfs/ngdbsoil (WFS, version 1.1.0)
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Get the entire data set:
ngdbsoil-csv.zip (Shapefile with a URL to the full report online, all attributes as included CSV files 54 MB zip expands to 482 MB)
Metadata:
About the database tables and fields