Geologic and structure maps of the Wallace 1°x2° quadrangle, Montana and Idaho: A digital database

Online link https://geo-nsdi.er.usgs.gov/metadata/map-i/1509/a/metadata.faq.html
Description 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 systsem (GIS) The digital geologic map database can be queried in many ways to pro
Originators Harrison, Jack E.; Griggs, A. B.; Wells, J. D.; Kelley, W. N.; and Derkey, Pamela D.
Publication U.S. Geological Survey Miscellaneous Investigations Series Map I-1509-A

Related topics

States or counties

Overview of attributes

The "Geologic and structure maps of the Wallace 1°x2°
quadrangle, Montana and Idaho: a digital database" report
(wal250k.pdf) contains a detailed description of each
attribute code and a reference to the associated map symbols
on the map source materials.  The database includes a geologic
linework arc attribute table, wal250k.aat, that relates to
the wal250k.con (contact look-up table), wal250k.st2
(structure look-up table), wal250k.lgu (linear geologic unit
look-up table), and wal250k.ref (source reference look-up
table) files; a rock unit polygon attribute table,
wal250k.pat, that relates to the wal250k.ru (rock unit
look-up table) and wal250k.ref (source reference look-up
table) files; and a breccia point attribute table,
wal250bc.pat, that relates to the wal250bc.ref (source
reference look-up table) files.

http://pubs.usgs.gov/imap/i1509a/wal250k.pdf