1. Geoscience Data Catalog

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

Bedrock geologic units, Faulting (geologic), Folding (geologic), Geologic maps, Geologic structure, Geospatial datasets, Stratigraphy, Structural geology, GeoscientificInformation

States or counties

Flathead, Lake, Mineral, Missoula, Sanders, Shoshone

Overview of attributes

Aeromagnetic anomaly grid cells are given in nanoteslas, and values
are expected to range from -400 to 400.
Gravity anomaly grid cells are given in milligals.  Values are
expected to range from -64 to 0 for complete Bouguer anomaly and
from -40 to 20 for isostatic anomaly.
Grids are provided in Geosoft's binary (proprietary) format with
georeference information stored in an ancillary file and as TIFF
images with georeference transformation information stored in
an ancillary .tfw "world" file.

http://pubs.usgs.gov/ds/321/ilinoh_desc.htm