Geologic and structure map of the Choteau 1 x 2 degree quadrangle, western Montana: a digital database.

Online link https://geo-nsdi.er.usgs.gov/metadata/map-i/1300/metadata.faq.html
Description The geologic and structure map of Choteau 1 x 2 degree quadrangle (Mudge and others, 1982) was originally converted to a digital format by Jeff Silkwood (U.S. Forest Service and completed by the U.S. Geological Survey staff and contractor at the Spokane
Originators Mudge, Melvill R.; Earhart, Robert L.; Whipple, James W.; Harrison, Jack E.; Munts, Steven R.; and Silkwood, Jeffery T.
Publication U.S. Geological Survey Miscellaneous Investigations Series Map I-1300

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 chot250k.ru
(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).

http://pubs.usgs.gov/imap/i1300/chot250k.pdf