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.