Chromite Deposits in Stillwater Complex, Sweet Grass Co., MT: A Digital Database for the Geologic Map of the East Slope of Iron Mountain, USGS OFR 01-321

This data set 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).

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 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
data.