Geologic and structure maps of the Wallace 1 deg. x 2 deg. quadrangle, Montana and Idaho: A digital database

This dataset was developed to provide a geologic map GIS of the Wallace 1x2
degree quadrangle for use in future spatial analysis by a variety of users.

This database is not meant to be used or displayed at any scale larger than
1:250,000 (e.g., 1:100,000 or 1:24,000)

This dataset was digitized by the U.S. Geological Survey EROS Data Center and
U.S. Geological Survey Spokane Field Office for input into an Arc/Info
geographic information system (GIS) The digital geologic map database can be
queried in many ways to produce a variety of derivative geologic maps.

This GIS consists of two major and Arc/Info datasets: one line and polygon file
(wal250k) containing geologic contacts and structures (lines) and geologic map
rock units (polygons), and one point file (wal250bc) containing breccia
outcrops.