Usgs dating groundwater using c 14
Precambrian basement structure map of the continental United States-an interpretation of geologic and aeromagnetic data Principal basement structures formed during the Precambrian in the continental United States based on interpretation of regional aeromagnetic anomaly data of North America.
Geological map data Characteristics of bedrock and surficial geologic terranes and structural features at various levels of detail.
Lowland sedimentary basin deposits record a history of deformation and changing environments in the Lowlands.
Deposits left during the last glacial maximum cover the Puget Lowland, and related glacial outburst floods inundated the Columbia and Willamette Valleys.
Asbestos mines, prospects, and occurrences in the US Location and mineralogical characteristics of former mines, prospects, and occurrences of asbestos in the continental US. Data here are drawn from several previously published reports.
These data were originally entered in the PLUTO database, which is now merged into the National Geochemistry Database.The data were originally entered into the in-house PLUTO database. Active mines and mineral plants in the US Mine plants and operations for commodities monitored by the National Minerals Information Center of the USGS.Operations included are those considered active in 2003 and surveyed by the USGS.Distribution of Potential Hydrothermally Altered Rocks in Central Colorado Derived From Landsat Thematic Mapper Data: A Geographic Information System Data Set As part of a mineral resource assessment, imagery data were used to help target areas where exposed rocks might be hydrothermally altered, providing an indication of the location of potentially mineralized areas that may contain mineral deposits.Characterization of Geologic Structures and Host Rock Properties Relevant to the Hydrogeology of the Standard Mine in Elk Basin, Gunnison County, Colorado Geological and borehole geophysical data and observations collected to characterize the basin and its surface and groundwater flow systems with primary focus on the physical characteristics of the fault vein, related mine workings, and surrounding bedrock Geophysical Characterization of Subsurface Properties Relevant to the Hydrology of the Standard Mine in Elk Basin, Colorado To help understand the hydrogeologic controls in the basin and how they affect surface and groundwater interactions with nearby mine workings, electrical resistivity profile, self–potential, and magnetic measurement data are provided herein.