README for U.S. Geological Survey Data Series 842 (Database for Miscellaneous Investigations Series Map I-2005)
Database for the Geologic Map of Upper Eocene to Holocene Volcanic and Related Rocks in the Cascade Range, Washington
By Andrew D. Barron, David W. Ramsey, and James G. Smith
ISSN 2327-638X (online)
DOI http://dx.doi.org/10.3133/ds842

This digital database was originally compiled in ArcInfo coverage format.  The database was upgraded for this release to
ArcGIS 9.3.1 personal geodatabase format and consists of a feature dataset containing geologic map feature classes for
the Geologic Map of Upper Eocene to Holocene Volcanic and Related Rocks in the Cascade Range, Washington depicted on
Sheet 1 of U.S. Geological Survey Miscellaneous Investigations Series Map I-2005. ArcGIS-compatible GIS software is
therefore required to use the files of this database.

The geodatabase is stored in a single zipped folder (18.3 MB in size) in this release for ease of transfer. The scale of
the source mapping limits the spatial resolution of the database to 1:250,000 scale or less detailed.