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

Online link
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

Related topics

States or counties

Overview of attributes

The 'Geologic and structure map of the Choteau 1 x 2 degree
quadrangle, Montana: a digital database' report (chot250k.pdf)
contains a detailed description of each attribute code and a
reference to the associated map symbols on the map source
materials.  The GIS includes a geologic line work arc attribute
table, chot250k.aat, that relates to the chot250k.con (contact
look-up table), chot250k.st2 (structure look-up table),
chot250k.lgu (linear geologic units table), and the chot250k.ref
(source reference look-up table) files; and a rock unit polygon
attribute table, chot250k.pat, that relates to the
(rock unit look-up table) and chot250k.ref (source reference
look-up table) files; and a point attribute table, chot250kp.pat,
that relates to the chot250p.sym (symbol description look-up
table) and the chot250p.ref (source reference look-up table).