|Description||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|
|Originators||Howland, A. L. and Moyer, Lorre A.|
|Publication||U.S. Geological Survey Open-File Report 01-321|
U.S. Geological Survey Open-File Report 01-321 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 linework arc attribute table, ironmtn.aat, that relates to the ironmtn.con (contact look-up table), ironmtn.st2 (structure look-up table), and the ironmtn.ref (source reference look-up table) files; a rock unit polygon attribute table, ironmtn.pat, that relates to the ironmtn.ru (rock unit look-up table) and ironmtn.ref (source reference look-up table) files; and a geologic map symbol point attribute table, ironmtnp.pat, that relates to the ironmtnp.sym (structural point data look-up tables) and ironmtnp.ref (source reference look-up table) files.