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Geochemical Characteristics of the Conterminous United States: % Na2O This raster depicts the percentage of lithological sodium oxide (Na2O) content in surface or near surface geology. We derived these rasters by calculating the average percent Na2O content for each map unit in combined surficial-bedrock geologic maps. We used state geologic maps (Preliminary Integrated Geologic Map Databases for the United States, Open File Reports 2004-1355, 2005-1305, 2005-1323, 2005-1324, 2005-1325, 2005-1351, and 2006-1272), which depict surficial geology instead of bedrock when the surficial layers are sufficiently deep. For the state maps that do not incorporate surficial geology (i.e., midwestern states), we overlaid surficial geologic map units with thicknesses greater than 100 feet (from... Categories: Data, Map; Types: ArcGIS REST Map Service, ArcGIS Service Definition, Citation, Downloadable, GeoTIFF, Map Service; Tags: Bedrock, Conterminous U.S., Geochemistry, Geology, Na2O, All tags... Sodium, Fewer tags