Geologic map and map database of the Palo Alto 30' X 60' quadrangle, California

This database and accompanying plot files depict the distribution of geologic
materials and structures at a regional (1:100,000) scale. The report is
intended to provide geologic information for the regional study of materials
properties, earthquake shaking, landslide potential, mineral hazards, seismic
velocity, and earthquake faults. In addition, the report contains new
information and interpretations about the regional geologic history and
framework. However, the regional scale of this report does not provide
sufficient detail for site development purposes. In addition, this map does
not take the place of fault-rupture hazard zones designated by the California
State Geologist (Hart and Bryant, 1997). Similarly, the database cannot be
used to identify or delineate landslides in the region.

This digital map database, compiled from previously published and unpublished
data, and new mapping by the authors, represents the general distribution of
bedrock and surficial deposits in the mapped area. Together with the
accompanying text file (pamf.ps, pamf.pdf, pamf.txt), it provides current
information on the geologic structure and stratigraphy of the area covered.
The database delineates map units that are identified by general age and
lithology following the stratigraphic nomenclature of the U.S. Geological
Survey. The scale of the source maps limits the spatial resolution (scale) of
the database to 1:62,500 or smaller.

The attached text file mf2332.rev contains current revision numbers for all
parts of this product.

This report consists of a set of geologic map database files (Arc/ Info
coverages) and supporting text and plotfiles. In addition, the report includes
two sets of plotfiles (PostScript and PDF format) that will generate map sheets
and pamphlets similar to a traditional USGS Miscellaneous Field Studies Report.
These files are described in the explanatory pamphlets (pamf.ps, pamf.pdf,
pamf.txt). The base map layer used in the preparation of the geologic map
plotfiles was scanned from a scale-stable version of the USGS 1:100,000
topographic map at a resolution of 300 dpi as a monochrome TIFF image. The
raster data was converted to a GRID in Arc/Info, and combined with geologic
polygon data to produce the final map image. The base map coverages included
with the database publication are vectorized versions of scans of scale-stable
seperates. These coverages contain no database information other than
position, and are included for reference only. In both cases the map digitized
was the Palo Alto (1982 version) 1: 100,000 quadrangle, which has a 50-meter
contour interval.