Introduction This report describes and makes available a geologic
digital spatial database (orgeo) representing the geologic map of
Oregon (Walker and MacLeod, 1991). The original paper publication
was printed as a single map sheet at a scale of 1:500,000,
accompanied by a second sheet containing map unit descriptions and
ancillary data. A digital version of the Walker and MacLeod (1991)
map was included in Raines and others (1996). The dataset provided
by this open-file report supersedes the earlier published digital
version (Raines and others, 1996). This digital spatial database is
one of many being created by the U.S. Geological Survey as an
ongoing effort to provide geologic information for use in spatial
analysis in a geographic information system (GIS). This database
can be queried in many ways to produce a variety of geologic maps.
This database is not meant to be used or displayed at any scale
larger than 1:500,000 (for example, 1:100,000). This report
describes the methods used to convert the geologic map data into a
digital format, describes the ArcInfo GIS file structures and
relationships, and explains how to download the digital files from
the U.S. Geological Survey public access World Wide Web site on the
Internet. Scanned images of the printed map (Walker and MacLeod,
1991), their correlation of map units, and their explanation of map
symbols are also available for download.
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