Many of these data layers were compiled from gray literature or unpublished sources and have not been available in digital form prior to this publication. These data have been converted to Environmental Systems Research Institute, Inc. (ESRI) "shapefile" format for use in the project Geographic Information System (GIS). Data are also supplied with complete FGDC compliant metadata. Sediment data and sample identifiers are also supplied in flat-file format and Microsoft Excel spreadsheet files for access to those who may not have GIS access.
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Trade, firm, or product names and other references to non-USGS products and services are provided for information only and do not constitute endorsement or warranty, express or implied, by the USGS, USDOI, or U.S. Government, as to their suitability, content, usefulness, functioning, completeness, or accuracy.
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