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The <2-millimeter fraction of each sample was analyzed for a suite of 45 major and trace elements by methods that yield the total, or near-total, elemental content. The major mineralogical components in the samples from the soil A and C horizons were determined by a quantitative X-ray diffraction method using Rietveld refinement. Sampling in the conterminous U.S. was completed in 2010 with chemical and mineralogical analyses completed in May, 2013. The resulting data set provides an estimate of the abundance and spatial distribution of chemical elements and minerals in soils of the conterminous U.S. and represents a baseline for soil geochemistry and mineralogy against which future changes may be recognized and quantified. This report (1) describes the sampling, sample preparation, and analytical methods used; (2) gives details of the quality control protocols used to monitor the quality of chemical and mineralogical analyses over approximately six years, and (3) makes available the soil geochemical and mineralogical data in downloadable tables.", "geometryType": "esriGeometryPoint", "sourceSpatialReference": { "wkid": 102967, "latestWkid": 6439, "xyTolerance": 0.001, "zTolerance": 0.001, "mTolerance": 0.001, "falseX": -19550100, "falseY": -7526400, "xyUnits": 10000, "falseZ": 0, "zUnits": 1, "falseM": 0, "mUnits": 1 }, "copyrightText": "USGS", "parentLayer": null, "subLayers": [], "minScale": 5000000, "maxScale": 0, "drawingInfo": { "renderer": { "type": "simple", "symbol": { "type": "esriPMS", "url": "91a64703445e158c84041830c9bb9885", "imageData": 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