Geologic Map of the Challis 1°x2° Quadrangle, Idaho

Online link https://geo-nsdi.er.usgs.gov/metadata/map-i/1819/metadata.faq.html
Description The paper version of The geology of the Challis 1°x2° quadrangle, was compiled by Fred Fisher, Dave McIntyre and Kate Johnson in 1992. The geology was compiled on a 1:250,000 scale topographic base map. TechniGraphic System, Inc. of Fort Collins Color
Originators Fisher, F. S.; McIntyre, D. H.; and Johnson, K. M.
Publication U.S. Geological Survey Miscellaneous Investigations Series Map I-1819

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States or counties

Overview of attributes

Polygons are given a general type and formation name; arcs are given a general type, dikes are also assigned a unit symbol.  Points are given a general type.  These values are currently listed in files *.tbl accompanying the ArcInfo interchange files.

http://pubs.usgs.gov/imap/i-1819/data/