Originator: A.L. Howland
Originator: L.A. Moyer
Chromite deposits in central part Stillwater Complex, Sweet Grass County,
Montana: A digital database for the geologic map of the east slope of Iron
Edition: Version 1.0
Series_Name: U.S. Geological Survey Open-File Report
Publication_Place: Menlo Park, CA
Publisher: U.S. Geological Survey
The digital geologic map of the east slope of Iron Mountain, Sweet Grass
County, Montana was prepared from preliminary digital datasets digitized by
Optronics Specialty Co., Inc. from a paper copy of plate 10 from UGSG Bulletin
1015-D (Howland, 1955).The files were prepared and transformed to the Montana
State Plane South projection by Helen Z. Kayser (Information Systems Support,
Inc.). Further editing and attributing was performed by Lorre A. Moyer in
2001. The resulting spatial digital database can be queried in many ways to
produce a variety of derivative geologic maps.
This dataset was developed to provide a geologic map GIS of the east slope of
Iron Mountain, Sweet Grass County, Montana for use in future spatial analysis
by a variety of users. These data can be printed in a variety of ways to
display various geologic features or used for digital analysis and modeling.
This database is not meant to be used or displayed at any scale larger than
1:3077 (for example, 1:2000 or 1:1500).
This GIS consists of two major ArcInfo datasets: one line and polygon file
(ironmtn) containing geologic contacts and structures (lines) and geologic map
rock units (polygons), and one point file (ironmtnp) containing structural
Currentness_Reference: Publication date of paper map.
Maintenance_and_Update_Frequency: No updates are planned.
Theme_Keyword_Thesaurus: Alexandria Digital Library Feature Type Thesaurus
Theme_Keyword: mineral deposit areas
Theme_Keyword_Thesaurus: USGS Thesaurus
Theme_Keyword: geologic maps
Theme_Keyword: metallic ores
Theme_Keyword: geospatial datasets
Theme_Keyword_Thesaurus: ISO 19115 Topic Categories
Place_Keyword: Sweet Grass County
Place_Keyword: Iron Mountain
Place_Keyword_Thesaurus: Augmented FIPS 10-4 and FIPS 6-4
Place_Keyword: f30097 = Sweet Grass
This digital database is not meant to be used or displayed at any scale larger
than 1:3077 (such as 1:2000).
Any hardcopies utilizing these data sets shall clearly indicate their source.
If the user has modified the data in any way they are obligated to describe
the types of modifications they have performed on the hardcopy map. User
specifically agrees not to misrepresent these data sets, nor to imply that
changes they made were approved by the US Geological Survey.
Contact_Person: Michael L. Zientek
Contact_Organization: U.S. Geological Survey
Address_Type: mailing and physical address
Address: 904 W. Riverside Ave., Rm. 202
In 2000, the U.S. Geological Survey contracted Optronics Specialty Co., Inc.
(Northridge, CA) to scan and vectorize the geologic map of the east slope of
Iron Mountain (Howland, 1955, plate 10). Helen Z. Kayser (contractor)
transformed the GIS provided by Optronics from scanner inches to a state plane
coordinate system (Montana South). Lorre A. Moyer then edited and attributed
the spatial digital data files with an interim geologic data model in 2001.
SunOS, 5.7, sun4u UNIX, and Windows NT 4.0 PC Workstation
ARC/INFO version 8.0