This database provides information on the occurrence of ultramafic rocks in the conterminous United States that are suitable for sequestering...
From the site: "Systematic geochemical and mineralogical survey of soil horizons analyzed using a consistent set of methods, sample spacing 1 per...
Interactive maps and downloadable data for regional and global Geology, Geochemistry, Geophysics, and Mineral Resources. --USGS
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