This database, identified as 'Maps of Quaternary deposits and liquefaction susceptibility in the Central San Francisco Bay Region, California', has been approved for release and publication by the Director of the USGS. Although this database has been reviewed and is substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. This database is released on condition that neither the USGS nor the U.S. Government may be held liable for any damages resulting from its use. 3. description of mapping, including description of mapping techniques and units and of the liquefaction interpretation. Part 4 is the digital spatial database: 4. Quaternary deposits and liquefaction susceptibility database. Parts 5 and 6 are graphic plot files for map sheets 1 and 2 at a scale of 1:200,000: 5. map sheet 1: plot file of the Quaternary deposits map, including an explanation of map units; 6. map sheet 2: plot file of the liquefaction susceptibility map. Part 7 is the database package, consisting of the spatial database (either coverage or shape file format) together with the three text files and metadata file. Part 8 is the plotfile package, with files in either postcript or PDF format. Part 9 is the metadata file, which is also included in the spatial database. The two colored maps are presented as digital plot files in PostScript and PDF format (image size 32 x 40 inches each). The PostScript map images (68.3 MB) can be used for viewing or plotting in computer systems with sufficient capacity, and the considerably smaller PDF files (30.4 MB) can be viewed or plotted in full or in part from Adobe ACROBAT running on Mac, PC, or UNIX platforms. The appearance of the maps in plots (colors and line weights) will depend on file type and the particular plotter that is used. The map database is provided both as an uncompressed ARC/INFO export file and as ArcView Shape files. The spatial database was compiled in vector form over the past several years using workstation ArcInfo, a

No abstract

Lake Volcanic Field, and the deposits from these volcanoes, or if they contained regional geological information that would be important to a researcher investigating aspects of the geology and geophysics of the area. Because of the relatively small number of references prior to 1940, we took a broader view of relevance within the older literature. Whereas, we took a more restrictive view of relevancy for the post-1940 references.

No abstract