Digital versions of geology and resource assessment maps originally published in 1987. 7 layers are available: geology and faults; gold mining area geology; favorable domains for selected deposit types; Bouguer gravity contours and lineaments; isostatic gravity contours; mineral deposits, prospects, and occurrences; and rock geochemistry sample points. Accompanied by MAPPER display software.

Contains vector-based digital geologic maps of surficial deposits in parts of 23 states where continental glaciation occurred during Quaternary. Map compilation was based on about 850 sources.

Contains 103 digitized color images from Open-file report 90-547, and USGS fact sheet 510-99, Progress toward a safer future since the 1989 Loma Prieta Earthquake.

Contains over 500 overlapping, high-resolution digital images of California coastline taken by digital camera connected to global positioning system receiver, to illustrate coastal geology adjacent to part of Monterey Bay National Marine Sanctuary.

Contains 97 digital images of volcanoes in south-central Alaska taken by Alaska Volcano Observatory scientists, other researchers, and private citizens which illustrate and document recent eruptive activity and the range of volcanic phenomena observed in Alaska. Disc contains Portable Document Format (PDF) files for viewing text and the photographs, as well as installers for Adobe Acrobat Reader 5.0 for both Macintosh and Windows. Each photograph...

Presents results of studies of 22 mining districts in central part of western slope of Colorado. These studies were undertaken to characterize mined materials, mine drainage, and influence of historic mining on nearby streams, and include sampling and chemical analysis of mine dumps, mill tailings, mine drainage, and surface waters.

Includes geologic, monitoring and topographic datasets related to Long Valley caldera. Contains a scan of the original geologic map by Roy Bailey. Real-time data of the current activity of the caldera (including earthquakes, ground deformation and the release of volcanic gas), information about volcanic hazards and the USGS response plan are available online at the observatory web page: http://lvo.wr.usgs.gov.

Contains 100 scanned photographs from the USGS Hawaiian Volcanic Observatory.