Geologic Map and Digital Database of the Upper Parashant Canyon and Vicinity, Mohave County, Northwestern Arizona

The geologic map of the upper Parashant Canyon area covers part of the Colorado
Plateau and several large tributary canyons that make up the western part of
Arizona's Grand Canyon. The map is part of a cooperative U.S. Geological
Survey and National Park Service project to provide geologic information for
areas within the newly established Grand Canyon/Parashant Canyon National
Monument. Most of the Grand Canyon and parts of the adjacent plateaus have been
geologically mapped; this map fills in one of the remaining areas where uniform
quality geologic mapping was needed. The geologic information presented may be
useful in future related studies as to land use management, range management,
and flood control programs for federal and state agencies, and private
concerns.

This digital map database is compiled from unpublished data and new mapping by
the authors, represents the general distribution of surficial and bedrock
geology in the mapped area. Together with the accompanying pamphlet, it
provides current information on the geologic structure and stratigraphy of the
area. The database dilineate map units that are identified by age and
lithology following the stratigraphic nomenclature of the U.S. Geological
Survey. The scale of the source maps limits the spatial resolution of the
database to 1:31,680 or smaller.

This report consists of a set of geologic map database files (ARC/ INFO
coverages) and supporting text and plot files. In addition, the report
includes two sets of plot files (Post Script 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
(para.eps, para.pdf, or para.txt). The base layer used in the preparation of
the geologic map plot files was derived from four Digital Raster Graphic
versions of standard USGS 7.5' quadrangles. These raster images where
converted to Grid format in ARC/INFO, trimmed and seamed together, then
converted to a GeoTIFF image. The resultant TIFF image was combined with
geologic data to produce the final map image in Illustrator 8.0.