U.S. Geological Survey. Geologic Division. Office of Mineral Resources
National-scale geologic map to support national and regional level projects, including mineral resource and geo-environmental assessments. The U.S. Department of Agriculture, Service Center Agencies should be acknowledged as the data source in products derived from these data.This data set is not designed for use as a primary regulatory tool in permitting or citing decisions, but may be used as a reference source. This information may be interpreted by organizations, agencies, units of government, or others based on needs; however, they are responsible for the appropriate application. Federal, State, or local regulatory bodies are not to reassign to the Service Center Agencies any authority for the decisions that they make. The Service Center Agencies will not perform any evaluations of these data for purposes related solely to State or local regulatory programs. Photographic or digital enlargement of these data to scales greater than at which they were originally mapped can cause misinterpretation of the data. Digital data files are periodically updated, and users are responsible for obtaining the latest version of the data.