Chromite deposits in central part Stillwater Complex, Sweet Grass County, Montana: A digital database for the geologic map of the east slope of Iron Mountain
In 1940, A.L. Howland and J. W. Peoples, assisted by W.R. Jones and M.G. Bennett, mapped the geology of the east slope of Iron Mountain, Montana. The map was…
Public-domain full text preserved in the Mountain Man Mining Library. Original source: pubs.usgs.gov.
Chromite Deposits in Central Part Stillwater Complex, Sweet Grass County, Montana: A Digital Database for the Geologic Map of the East Slope of Iron Mountain
By A.L. Howland1 Digital data by Lorre A. Moyer2
Open-File Report 01-321 Digital database, version 1.0
Manuscript approved for publication September 7, 2001
Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. The digital database is not meant to be used or displayed at any scale larger than 1:3077 (such as, 1:2000 or 1:1500).
U.S. Department Of The Interior U.S. Geological Survey
1 Washington, D.C. 2 Reno, Nevada
Table of Contents
INTRODUCTION 3 LIST OF MAP UNITS 3 DATA SOURCES, PROCESSING, AND ACCURACY 5 GIS DOCUMENTATION 8 LINEAR FEATURES 8 AREAL FEATURES 11 POINT FEATURES 13 SOURCE ATTRIBUTES 14 OBTAINING DIGITAL DATA 15 OBTAINING PAPER MAPS 15 REFERENCES CITED 16 APPENDIX A - LIST OF DIGITAL FILES IN THE IRON MOUNTAIN GIS 17 APPENDIX B - ARCINFO MACRO LANGUAGE PROGRAM (IRONMTN.AML) USED TO PLOT THE GEOLOGIC MAP OF THE EAST SLOPE OF IRON MOUNTAIN 18 APPENDIX C - METADATA FILE (IRONMTN.MET) FOR THE IRON MOUNTAIN GIS 21
List of Figures
Figure 2. Explanation for the simplified digital geologic map of the east slope of Iron Mountain
Introduction In 1940, A.L. Howland and J. W. Peoples, assisted by W.R. Jones and M.G. Bennett, mapped the geology of the east slope of Iron Mountain, Montana. The map was revised and extended by Howland in 1942 and published in 1955 as plate 10 of the U.S. Geological Survey Bulletin 1015-D (Howland, 1955). In 2000, the USGS contracted Optronics Specialty Co., Inc. of Northridge, CA to prepare a scanned digital version of plate 10. Geospatial editing and attributing of the scanned map of the east slope of Iron Mountain was performed by the USGS in order to produce an interim digital product. This digital geospatial database is one of many being created by the U.S. Geological Survey as an ongoing effort to provide geologic information in a geographic information system (GIS) for use in spatial analysis. The map was compiled from the preliminary digital files prepared by Optronics Specialty Co., Inc. which were prepared and transformed by Helen Z. Kayser, Information Systems Support, Inc., Spokane, WA. The resulting digital geologic map (GIS) database can be queried in many ways to produce a variety of geologic maps. Digital base map data files (topography, roads, towns, rivers and lakes, etc.) are not included: they may be obtained from a variety of commercial and government sources. This database is not meant to be used or displayed at any scale larger than the original map scale 1:3077 (such as, 1:2000 or 1:1500). The digital geologic map graphics and plot files (ironmtn.gra/.eps and ironmtn-map.pdf) that are provided in the digital package are representations of the digital database. The map area is located in the central part of the Stillwater complex of south central Montana (fig. 1). This report lists the geologic map units, the methods used to convert the geologic map data into a digital format, the ArcInfo GIS file structures and relationships, and explains how to download the digital files from the U.S. Geological Survey public access World Wide Web site on the Internet. Manuscript reviews by Helen Z. Kayser and Pamela D. Derkey are greatly appreciated. We also wish to thank Michael L. Zientek for the review of the map units and the digital files. List of Map Units The rock units listed below are from the published geologic map of the east slope of Iron Mountain, Sweet Grass County, Montana, plate 10 of Howland (1955).
Stillwater Complex
Ultramafic Zone pg
Basic pegmatite
br
Bronzitite
hz
Harzburgite
shz
Serpentinized harzburgite
Figure 1. Index map showing the geographic extent of the mapped area.
gh
Granular harzburgite
sgh
Serpentinized granular harzburgite
ph
Poikilitic harzburgite
ph/cr
Poikilitic harzburgite with disseminated chromite
sph
Serpentinized granular harzburgite
sph/cr Serpentinized poikilitic harzburgite with disseminated chromite
Basal Zone dn
Diabasic norite
BASEMENT COMPLEX bc Metasedimentary rock
Data Sources, Processing, and Accuracy
The geologic map of the east slope of Iron Mountain, Sweet Grass County, Montana (Howland, 1955) was originally a paper document, converted to digital files by Optronics Specialty Co., Inc. The preliminary digital files were given to the U.S. Geological Survey (USGS) in an ArcInfo interchange format in scanner units. The files were then prepared and transformed, using tic points, to Montana State Plane projection (zone 4526, NAD 27) by Helen Z. Kayser, Information Systems Support, Inc. The digital files were augmented with an interim geologic map data model (data base), further attributed and edited by Lorre A. Moyer (USGS), and then plotted and compared to the original field geologic maps to check for digitizing and attributing errors. Processing by the U.S. Geological Survey was done in ArcInfo version 8.0 installed on a Sun Ultra workstation and Arc8 installed on an NT desktop computer. The overall accuracy (with respect to the location of lines and points) of the digital geologic map (see figs. 2 and 3 for page-size versions) is probably no better than +/- 15 feet. This digital database is not meant to be used or displayed at any scale larger than 1:3077 (for example, 1:2000 or 1:1500).
GIS Documentation
The digital geologic map of the east slope of Iron Mountain (scale 1:3077) includes a geologic linework arc attribute table, IRONMTN.AAT, that relates to the IRONMTN.CON, IRONMTN.ST2, IRONMTN.LGU and IRONMTN.REF files; a rock unit polygon attribute table, IRONMTN.PAT, that relates to the IRONMTN.RU and IRONMTN.REF files; and a geologic map symbol point attribute table, IRONMTNP.PAT, that relates to the IRONMTNP.SYM and IRONMTNP.REF files (see fig. 4). These data files are described below. Linear Features Descriptions of the items identifying linear features such as contacts, boundaries (for example, lines of latitude and longitude, state boundaries) and structures in the arc (or line) attribute table, IRONMTN.AAT, are as follows: IRONMTN.AAT ITEM NAME ITEM TYPE ITEM LENGTH ATTRIBUTE DESCRIPTION linecode integer Numeric code used to identify type of linear feature. Linecodes 100 are used for contacts and boundaries which are described in the IRONMTN.CON file. Linecodes 100 and 600 represent structural features which are described in the IRONMTN.ST2 file. Linecodes 800 represent linear geologic units that are described in the IRONMTN.LGU file. name character Name given to mineralized feature. source integer Numeric code used to identify the data source for the linear feature. Complete references for the sources are listed in the IRONMTN.REF file.
Arc attribute table and related look-up tables:
ironmtn.aat linecode name source
ironmtn.con linecode symbol type modifier certainty desc
ironmtn.st2 linecode symbol type horizontal vertical fold plunge accuracy certainty desc
ironmtn.lgu linecode label symbol type accuracy certainty desc
ironmtn.ref source scale authors year reference
Polygon attribute table and related look-up tables:
ironmtn.pat unit source label desc
ironmtn.ru unit label symbol name ss lith desc minage maxage source
ironmtn.ref source scale authors year reference
Point attribute table and related look-up tables:
ironmtnp.pat type symbol optang strike dip calcang sym$ang source
ironmtnp.sym type symbol desc
ironmtnp.ref source scale authors year reference
Figure 4: Relationships between feature attribute tables and look-up tables
Attribute descriptions for items in the contact (and boundary) look-table, IRONMTN.CON [GEOL_DIA.LIN linesets], are as follows: IRONMTN.CON ITEM NAME ITEM TYPE ITEM LENGTH ATTRIBUTE DESCRIPTION linecode integer Numeric code (a value 100) used to identify type of contact or boundary. (This item also occurs in IRONMTN.AAT.) symbol integer Line symbol number used by Arc/Info to plot lines. Symbol numbers refer to the GEOL_DIA.LIN lineset for linecodes 100. type character Major type of line, for example, contact, state boundaries, lines of latitude and longitude used for neatlines. modifier character Line type modifier, that is, approximate, concealed, gradational. No entry implies ‘known.’ certainty character Degree of certainty of contact or boundary, that is, inferred, uncertain. No entry implies ‘certain.’ desc character Written description or explanation of contact or boundary.
Attribute descriptions for items in the structure look-up table, IRONMTN.ST2 [for use with the GEOL_DIA.LIN lineset], are as follows: IRONMTN.ST2 ITEM NAME ITEM TYPE ITEM LENGTH ATTRIBUTE DESCRIPTION linecode integer Numeric code (a value 100 and 600) used to identify type of structural feature. (This item also occurs in IRONMTN.AAT.) symbol integer Line symbol number used by Arc/Info to plot arc (line). Symbol numbers refer to the GEOL_DIA.LIN lineset. type character Major type of structure, that is, fault, fracture, fold, other. horizontal character Type of horizontal fault movement, for example, left-lateral, right-lateral. No entry implies ‘unknown.’ vertical character Type of vertical fault movement, for example, normal. No entry implies ‘unknown.’ fold character Type of fold, for example, anticline, syncline. plunge character Type of plunge on fold, that is, horizontal, plunging, plunging in, plunging out. accuracy character Line type modifier indicating degree of accuracy, that is, approximately located, concealed, gradational. No entry implies ‘known.’ certainty character Degree of certainty of contact or boundary, that is, inferred, uncertain. No entry implies ‘certain.’ desc character Written description or explanation of structural feature.
Attribute descriptions for items in the structure look-up table, IRONMTN.LGU [for use with the GEOL_DIA.LIN lineset], are as follows: IRONMTN.LGU ITEM NAME ITEM TYPE ITEM LENGTH ATTRIBUTE DESCRIPTION linecode integer Numeric code (a value 800) used to identify type of linear geologic unit. (This item also occurs in IRONMTN.AAT.) label character Linear geologic unit label used to label unit on map. symbol integer Line symbol number used by ArcInfo to plot arc (line). Symbol numbers refer to the GEOL_DIA.LIN lineset. type character Major type of linear geologic unit, that is, basic dike, chromite layers, other. accuracy character Line type modifier indicating degree of accuracy, that is, approximately located, concealed, gradational. No entry implies ‘known.’ certainty character Degree of certainty of contact or boundary, that is, inferred, uncertain. No entry implies ‘certain.’ desc character Written description or explanation of structural feature.
Areal Features Descriptions of the items identifying geologic units in the polygon attribute table, IRONMTN.PAT, are as follows: IRONMTN.PAT ITEM NAME ITEM TYPE ITEM LENGTH ATTRIBUTE DESCRIPTION unit integer Numeric code used to identify the rock unit which is described in the IRONMTN.RU look-up table. (This item also occurs in IRONMTN.RU.) source integer Numeric code used to identify the data source for the rock unit. Complete references for the sources are listed in the IRONMTN.REF file. label character Rock unit label (abbreviation) used to label unit on map. (This item was joined from the IRONMTN.RU look-up table.) desc character Formal or informal unit name. (This item was joined from the IRONMTN.RU look-up table.)
Attribute descriptions for items in the lithology (rock unit) look-table, IRONMTN.RU (for use with the WPGCMYK.SHD shadeset), are as follows: IRONMTN.RU ITEM NAME ITEM TYPE ITEM LENGTH ATTRIBUTE DESCRIPTION unit integer Numeric code used to identify rock unit. (This item also occurs in IRONMTN.PAT.) label character Rock unit label (abbreviation) used to label unit on map. symbol integer Shadeset symbol number used by ArcInfo to plot a filled/shaded polygon. The symbol numbers used in this file refer to the WPGCMYK.SHD shadeset. name character The prefix portion of the rock unit label that does not include subscripts. (If subscripting is not used in the original unit label, then the ‘name’ entry is the same as the ‘label’ entry.) ss character The suffix portion of the geologic unit label that includes subscripts. lith character Major type of lithostratigraphic unit, that is, unconsolidated sediments, sedimentary rocks, metasedimentary rocks, intrusive rocks, extrusive rocks, metamorphic rocks, water, ice. desc character Formal or informal unit name minage character Minimum stratigraphic age of lithologic unit, that is, CRET, TERT, PCY. maxage character Maximum stratigraphic age of lithologic unit source character Numeric code used to identify the data source for the rock unit. Complete reference for the sources are listed in the IRONMTN.REF.
Point Features Descriptions of the items identifying geologic map symbols are given in the point attribute table, IRONMTNP.PAT, which is defined as follows: IRONTMNP.PAT ITEM NAME ITEM TYPE ITEM LENGTH ATTRIBUTE DESCRIPTION type character Type of point symbol, for example, strike and dip of inclined bedding, strike and dip of inclined cleavage, geochemical sample location. (This item also occurs in the IRONMTNP.SYM file.) symbol integer Marker symbol number used by ArcInfo to identify type of geologic map symbol. Symbol numbers refer to the GEOSCAMP2.MRK markerset (Matti and others, 1997). (This item also occurs in the IRONMTNP.SYM file.) optang integer The angle value assigned to the strike symbol when Specialty Co., Inc strike integer Strike of bedding, foliation or cleavage. Strike is an azimuthal angle (measured in degrees from 0 to 360 in a clockwise direction from North). dip integer Dip of bedding, foliation or cleavage. This value is an angle measured (in degrees from 0 to 90) down from the horizontal; thus a horizontal dip is 0 degrees and a vertical dip is 90 degrees. calcang integer An interim value used to calculate sym$angle. The various structural map symbols in the GEOSCAMP2.MRK markerset (Matti and others, 1997) had to be rotated by different amounts to achieve their proper map orientation. For the strike and dip symbols, calcang strike – 90. sym$ang integer The angle used to complete the mathematical rotation of the structural map symbol to its proper orientation on the map. This value is the $angle pseudoitem value for the point. source integer Numeric code used to identify the data source for the structural map symbol. Complete references for the sources are listed in the IRONMTNP.REF file.
Attribute descriptions for items in the geologic map symbols look-up table, IRONMTNP.SYM, [for use with the GEOSCAMP2.MRK markerset (Matti and others, 1997)], are as follows: IRONMTNP.SYM ITEM NAME ITEM TYPE ITEM LENGTH ATTRIBUTE DESCRIPTION type character Type of point symbol, for example, strike and dip of inclined bedding, strike and dip of inclined cleavage. (This item also occurs in the IRONMTNP.PAT file.) symbol integer Marker symbol number used by ArcInfo to identify type of structural map symbol. Symbol numbers refer to the GEOSCAMP2.MRK markerset (Matti and others, 1997). desc character Written description or explanation of map symbol.
Source Attributes Descriptive source or reference information for the IRONMTN and IRONMTNP ArcInfo datasets is stored in the IRONMTN.REF and IRONMTNP.REF files, respectively. Attribute descriptions for items in the IRONMTN.REF and IRONMTNP.REF data source files are as follows: IRONMTN.REF / IRONMTNP.REF ITEM NAME ITEM TYPE ITEM LENGTH ATTRIBUTE DESCRIPTION source integer Numeric code used to identify the data source. (This item also occurs in the IRONMTN.AAT, IRONMTN.PAT, and IRONMTNP.PAT files.) scale integer Scale of source map. (This value is the denominator of the proportional fraction that identifies the scale of the map that was digitized or scanned to produce the digital map.) authors character Author(s) or compiler(s) of source map entered as last name, first name or initial, and middle initial. year integer Source (map) publication date reference character Remainder of reference in USGS reference format.
Obtaining Digital Data
The complete digital version of the geologic map is available in ArcInfo interchange format with associated data files. These data and map images are maintained in a state plane coordinate system: Projection: stateplane Zone:
Datum:
NAD27 Units:
feet To obtain copies of the digital data, do one of the following: 1. Download the digital files from the USGS public access World Wide Web site on the Internet: URL ://geopubs.wr.usgs.gov/open-file/of01-321/ 2. Anonymous FTP from geopubs.wr.usgs.gov, in the directory
pub/open-file/of01-321 The Internet sites contain the spatial digital database for the geologic map of the Iron Mountain area as ArcInfo interchange-format files (ironmtn.e00 and ironmtnp.e00); a geologic map as Encapsulated PostScript and Adobe Acrobat portable document files (ironmtn.eps/.pdf), as well as the associated data files and ArcInfo macro programs which are used to plot the map at a scale of 1:3077 (see Appendix A and B); and formatted metadata (see Appendix C).
To manipulate this data in a geographic information system (GIS), you must have a GIS that is capable of reading ArcInfo interchange-format files.
Obtaining Paper Maps
Paper copies of the digital geologic map are not available from the U.S. Geological Survey. However, with access to the Internet and access to a large-format color plotter that can interpret either Encapsulated PostScript files, or PDF (portable document format) files, a 1:3077-scale paper copy of the map can be made, as follows: 1. Download the digital version of the map, ironmtn.eps or ironmtn-map.pdf, from the USGS public access World Wide Web site on the Internet using the URL ://geopubs.wr.usgs.gov/open-file/of01-321/ or 2. Anonymous FTP the plot file, ironmtn.eps or ironmtn-map.pdf, from: geopubs.wr.usgs.gov, in the directory:
pub/open-file/of01-321 3. This file can be plotted by any large-format color plotter that can interpret EPS or PDF files. The finished plot is about 18 inches by 20 inches. Paper copies of the map can also be created by obtaining the digital file as described above and then creating a plot file in a GIS.
References Cited
Howland, A.L., 1955, Chromite deposits in central part Stillwater Complex, Sweet Grass County, Montana: U.S. Geological Survey Bulletin 1015-D, 121 p., 4 plates.
Matti, J.C., Miller, F.K., Powell. R.E., Kennedy, S.A., Bunyapanasarn, T. P., Koukladas, C., Hauser, R.M., and Cossette, P.M., 1997, Geologic-point attributes for digital geologicmap data bases produced by the Southern California Areal Mapping Project (SCAMP): U.S. Geological Survey Open-File Report 97-859, 7 p.
Appendix A
Appendix A - List of digital files in the Iron Mountain GIS
--Use the ‘importfile.aml’ to IMPORT all of the *.E00 files for use in ArcInfo. --Use the ArcInfo ‘DRAW’ command to plot the *.GRA file to your screen. (Make sure the display is set with the ArcInfo ‘DISPLAY’ command.) --Use the ArcInfo ‘HPGL2’ command to create a HPGL2 file from the *.GRA file. --Use the UNIX ‘lpr -P<plotter_name> ironmtn.hp’ command to send the ironmtn.hp file to a large-format color plotter that can interpret Hewlett-Packard Graphics Language. --To re-create the *.GRA file, enter the ArcInfo command ‘&run ironmtn’ at the Arc: prompt.
Primary ArcInfo exchange-format (*.e00) and metadata files for the digital geology:
ironmtn.e00 – line and poly GIS
ironmtnp.e00 – point GIS
ironmtn.met – metadata
ArcInfo graphics (*.gra), Encapsulated PostScript map plot (*.eps), and portable document format (*.pdf) files for the geologic map sheet:
ironmtn.gra/.eps
ironmtn-map.pdf
Additional ArcInfo exchange -format files (*.e00) necessary to re -create the geologic map sheet:
fnt026.e00 – font 26
fnt027.e00 – font 27
fnt035.e00 – font 35
fnt037.e00 – font 37
fnt038.e00 – font 38
fnt039.e00 – font 39
fnt040.e00 – font 40
geol_dia.lin.e00 - lineset
geoscamp2.mrk.e00 - markerset
imquad.e00 - exterior boundary of the map area wpgcmyk.shd.e00 - shadeset
ArcInfo Macro Language (*.aml), graphics (*.gra), key (*.key), projection (*.prj), and text (*.dat and *.txt) files necessary to re-create the geologic map sheet:
ironmtn.aml - program that creates a graphics file of the geologic map
linebar.aml – program that creates a scalebar
indx_irmt.gra - index map graphic file
usgslogo.gra – USGS visual identity
irmt-lin.key - lineset symbol values and descriptive text for lines on the map sheet.
irmt-pnt.key - markerset symbol values and descriptive text for map symbols (markers) on the map sheet.
irmt-pol.key - shadeset symbol values and descriptive text for geologic map units on the map sheet
geo.prj - a text file used to identify realworld (geographic) coordinates - for use in adding latitude and longitude notation around the margins of the map
msp.prj - a text file to identify Montana State Plane South (zone 4526) coordinate system - for use in adding spatial reference notation around the margins of the map
irmt-crd.txt - text file listing map credits.
irmt-dis.txt – text file giving USGS disclaimer statement
irmt-ref.txt - text file listing map references
cal.dat – plotter calibration data file
Appendix B
Appendix B - ArcInfo Macro Language program (ironmtn.aml) used to plot the geologic map of the East Slope of Iron Mountain
ironmtn.aml, 5/15/01 lam; 12/6/01, pd U.S. Geological Survey Open-File Report 01321
This ArcInfo Macro Language (AML) program will plot a digital geologic map for the east slope of Iron Mountain at 1:3077 scale.
To run this AML: 1. Type '&run ironmtn' at the 'Arc:' prompt to start the program, 2. Run the ArcInfo HPGL2 command to convert the GRA file to an HPGL2 file, /*i.e., 2 ironmtn ironmtn.hp # 1.0 opaque # 0 # # # cal.dat 3. Execute the UNIX 'lpr' command to print the 1:3077-scale geologic map /*on your plotter, i.e., lpr -Ppicasso ironmtn.hp ap display 1040 ironmtn.gra
clear clearselect
pagesize 34 31.5 pageunits inches mapunits feet mapscale 3077 mapposition ll 2.75 6.0
&set cover ironmtn &set quad imquad &set logo usgslogo.gra &set pntcover ironmtnp where 'cover' contains contacts and structures and rock units; where 'quad' is an outer boundary; where 'pntcover' contains structural symbols for layers and joints and uses symbols from geoscamp2.mrk
&s key1 irmt-pol.key &s key2 irmt-lin.key &s key3 irmt-ref.txt &s key4 irmt-pnt.key &s credits irmt-crd.txt &s disclaimer irmt-dis.txt
mape %quad% maplimits 0.0 2.4 28.5 28.5
/*draw outside box linesymbol 9 linecolor 1 box 0.5 0.5 33.0 30.0
textquality proportional textfont 94021 linedelete all
cut marks markerset plotter markersymbol 1 markersize 0.1 marker 0 0 marker 0 30.5 marker 33.5 0 marker 33.5 30.5
&label shadepolys color polygons for geologic rock units shadedelete all shadeset wpgcmyk.shd polygonshade %cover% unit %cover%.ru
&label contacts plot contacts and boundaries linedelete all lineset geol_dia.lin res %cover% arcs linecode gt 0 and linecode lt arclines %cover% linecode %cover%.con asel %cover% arcs
&label lgu linedelete all lineset geol_dia.lin
Appendix B
res %cover% arcs linecode gt 800 and linecode lt arclines %cover% linecode %cover%.lgu asel %cover% arcs
&label structures plot faults with line patterns linedelete all lineset geol_dia.lin res %cover% arcs linecode gt 100 and linecode lt arclines %cover% linecode %cover%.st2 asel %cover% arcs
scalebar &r linebar.aml 11.5 2 1000 10 feet feet .02 .1
&label mapquad plot quadrangle boundary linedelete all lineset plotter linesymbol 5 arcs %quad%
&label geolabels textsize 0.10 res %cover% poly area gt 3500 labeltext %cover% unit %cover%.ru cc asel %cover% poly
&label points plot points for map symbols markerdelete all markerset geoscamp2.mrk pointmarkers %pntcover% symbol
&label anno /*plot annotation for all points and names textset font.txt textquality proportional annotext %pntcover% dip annotext %cover% name
&label titles textfont 93715 textquality kern textsize 0.35 plot %logo% box 2.0 27.75 5.0 28.75 move 5.5 28.5 text 'U.S. Department of the Interior' move 5.5 27.9 text 'U.S. Geological Survey' move 30.0 28.5 text 'Open-File Report 01-321' lr move 30.0 27.9 text 'Database, Version 1.0' lr textfont 93711 textsize 0.5 move 13.75 5.5 text 'Chromite Deposits in Central Part Stillwater Complex,' lc move 13.75 4.9 text 'Sweet Grass County, Montana:' lc textsize 0.5 move 13.75 4.3 text 'A Digital Database for the Geologic Map of the East Slope of Iron Mountain' lc textsize 0.3 move 13.75 3.7 text 'by' lc move 13.75 3.2 text 'A. L. Howland and Lorre A. Moyer' lc move 13.75 2.7 text '2001' lc textfont 93711 textsize 0.12 move 13.75 2.3 text 'Scale 1:3077' lc
&label explan plot explanation - geologic units shadedelete all shadeset wpgcmyk.shd textfont 93711 textsize 0.25 move 25.75 25.0 text 'Explanation' textsize 0.12 textquality proportional textfont 94021 keyarea 25.75 2.8 43.5 24.5 keybox 0.6 0.35 keyseparation 0.2 0.2 keyshade %key1%
&label linekey /*plot explanation - line key linedelete all lineset geol_dia.lin keybox 0.6 0.0 keyline %key2% nobox
&label strikedip /*plot explanation - point key textsize 0.12 textquality proportional textfont 94021 markerdelete all markerset geoscamp2.mrk
Appendix B
keymarker %key4% nobox markerdelete all textsize 0.10 textquality proportional move 33.6 14.0
&label disclaimer textfont 94021 textquality proportional textsize 0.12 move 25.75 2.2 textfile %disclaimer%
&label credits /*list credits textfont 94021 textquality proportional textsize 0.12 move 19.45 6.75 textfile %credits%
&label proj /*plot map projection notes textfont 94021 textquality proportional textsize 0.12 move 3.9 6.75 text 'State Plane Coordinate System, zone 4526' move 3.9 6.65 text 'Units: feet' move 3.9 6.47 text 'North American Datum 1927'
&label references list references textfont 93711 textsize 0.25 textcolor 1 move 25.75 6.75 text 'References' move 25.75 6.5 textsize 0.12 textquality proportional textfont 94021 textfile irmt-ref.txt
&label index-map plot indx_irmt.gra box 25.75 3.25 31.9 5.25 textfont 94021 textquality proportional textsize 0.12 move 25.75 3.05 text 'Index map showing Iron Mountain area' move 25.75 2.945 text 'in Sweet Grass County, Montana'
&label lat-long /*plot neat line labels (latitude and longitude) mape %quad% linecolor 1 mapprojection geo.prj msp.prj neatline 1855000 511000 1860000 516000 msp.prj neatlinehatch 1000 1000 .25 0 msp.prj textset font.txt textsymbol 1 textsize 8 pt textstyle typeset textoffset -0.35 0.15 neatlinelabels 1000 top all msp.prj textoffset -0.75 0.0 neatlinelabels 1000 left all msp.prj
&label done quit display 9999 3 draw ironmtn &return
Appendix C
Appendix C - Metadata file (ironmtn.met) for the Iron Mountain GIS
Identification_Information: Citation: Citation_Information: Originator: A.L. Howland and L. A. Moyer Publication_Date: 2001 Title: Chromite deposits in central part Stillwater Complex, Sweet Grass County, Montana: A digital database for the geologic map of the east slope of Iron Mountain Edition: Version 1.0 Geospatial_Data_Presentation_Form: map Series_Information: Series_Name: U.S. Geological Survey Open-File Report Issue_Identification: Open-File Report 01-321 Publication_Information: Publication_Place: Menlo Park, CA Publisher: U. S. Geological Survey Online_Linkage: URL ://geopubs.wr.usgs.gov/open-file/of01-321/ Description: Abstract: The digital geologic map of the east slope of Iron Mountain, Sweet Grass County, Montana was prepared from preliminary digital datasets 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. Purpose: 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). Supplemental_Information: This GIS consists of two major ArcInfo datasets: one line and polygon file
Appendix C
(ironmtn) containing geologic contacts and structures (lines) and geologic map rock units (polygons), and one point file (ironmtnp) containing structural data. Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1955 Currentness_Reference: Publication date of paper map. Status: Progress: complete Maintenance_and_Update_Frequency: No updates are planned. Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -110.06 East_Bounding_Coordinate: -110.05 North_Bounding_Coordinate: 45.41 South_Bounding_Coordinate: 45.40 Keywords: Theme: Theme_Keyword_Thesaurus: none Theme_Keyword: geology Theme_Keyword: geologic map Place: Place_Keyword_Thesaurus: none Place_Keyword: Montana Place_Keyword: Sweet Grass County Place_Keyword: Iron Mountain Place_Keyword: USA Access_Constraints: none Use_Constraints: 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. Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Michael L. Zientek Contact_Organization: U.S. Geological Survey Contact_Position: geologist
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Contact_Address: Address_Type: mailing and physical address Address: 904 W. Riverside Ave., Rm. 202 City: Spokane State_or_Province: WA Postal_Code: 99201 Country: USA Contact_Voice_Telephone: 1-509-368-3105 Contact_Facsimile_Telephone: 1-509-368-3199 Contact_Electronic_Mail_Address: zientek@usgs.gov Data_Set_Credit: 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. Native_Data_Set_Environment: SunOS, 5.7, sun4u UNIX, and Windows NT 4.0 PC Workstation ARC/INFO version 8.0 Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: Attribute accuracy was verified by manual comparison of the source with hard copy printouts, plots, and on-screen evaluation. Logical_Consistency_Report: Polygon and chain-node topology present. Segments making up the outer and inner boundaries of a polygon tie end-to-end to completely enclose the area. Line segments area set of sequentially numbered coordinate pairs. No duplicate features exist nor duplicate points in a data string. Intersecting lines are separated into individual line segments at the point of intersection. Point data are represented by two sets of coordinate pairs, each with the same coordinate values. All nodes are represented by a single coordinate pair which indicates the beginning or end of a line segment. The neatline was generated by mathematically generating the four sides of the quadrangle, densifying the lines of latitude and projecting the file to Montana State Plane zone 4526. Completeness_Report: All geologic units from Howland (1955, plate 10) are included in this GIS. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report:
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The horizontal position accuracy for the digital data is no better than 15 feet based on the digitizing RMS error. Lineage: Source_Information: Source_Citation: Citation_Information: Originator: Howland, A.L. Publication_Date: 1955 Title: Geologic map of the east slope of Iron Mountain, Sweet Grass County, Montana Geospatial_Data_Presentation_Form: map Series_Information: Series_Name: U.S. Geological Survey Bulletin Issue_Identification: Bulletin 1015-D Publication_Information: Publication_Place: Washington, D.C. Publisher: U.S. Geological Survey Source_Scale_Denominator: 3077 Type_of_Source_Media: paper map Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1955 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Howland (1955) Source_Contribution: Howland (1955, plate 10) was the sole source of geologic information in this GIS. Process_Step: Process_Description: Optronics Specialty Co., Inc. (Northridge, CA) scanned and vectorized 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. Process_Date: 2000-2001 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Grid_Coordinate_System: Grid_Coordinate_System_Name: State Plane Coordinate System State_Plane_Coordinate_System: SPCS_Zone_Identifier: 4526
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Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: 0.000004 Ordinate_Resolution: 0.000004 Planar_Distance_Units: Survey feet Geodetic_Model: Horizontal_Datum_Name: North American Datum of 1927 Ellipsoid_Name: Clarke 1866 Semi-major_Axis: 6378206.4 Denominator_of_Flattening_Ratio: 294.98 Entity_and_Attribute_Information: Overview_Description: Entity_and_Attribute_Overview: 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. Entity_and_Attribute_Detail_Citation: A detailed description of the items in the Iron Mountain GIS are given in the text of Open-File Report 01-321 available in Adobe Acrobat PDF format on the World Wide Web at ://geopubs.wr.usgs.gov/open-file/01-321/ Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Voice_Telephone: 1-888-ASK-USGS Contact_Instructions: This report is only available in electronic format at URL ://geopubs.wr.usgs.gov/open-file/of01-321/ or via anonymous FTP from geopubs.wr.usgs.gov in the directory pub/open-file/of01-321 Distribution_Liability: The U.S. Geological Survey (USGS) provides these geographic data "as is". The USGS makes no guarantee or warranty concerning the accuracy of information contained in the geographic data. The USGS further makes no
Appendix C
warranties, either expressed or implied as to any other matter whatsoever, including, without limitation, the condition of the product, or its fitness for any particular purpose. The burden for determining fitness for use lies entirely with the user. Although these data have been processed successfully on computers at the USGS, no warranty, expressed or implied, is made by the USGS regarding the use of these data on any other system, nor does the fact of distribution constitute or imply any such warranty.
In no event shall the USGS have any liability whatsoever for payment of any consequential, incidental, indirect, special, or tort damages of any kind, including, but not limited to, any loss of profits arising out of use of or reliance on the geographic data or arising out of the delivery, installation, operation, or support by USGS.
This digital geologic map GIS of the east slope of Iron Mountain, Sweet Grass County, Montana is not meant to be used or displayed at any scale larger than 1:3077 (for example, 1:2000). Metadata_Reference_Information: Metadata_Date: 20011205 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: Pamela D. Derkey Contact_Position: geologist Contact_Address: Address_Type: mailing and physical address Address: 904 West Riverside Avenue, Rm 202 City: Spokane State_or_Province: WA Postal_Code: 99201 Country: USA Contact_Voice_Telephone: 1-509-368-3114 Contact_Facsimile_Telephone: 1-509-368-3199 Contact_Electronic_Mail_Address: pderkey@usgs.gov Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998 Metadata_Time_Convention: local time Metadata_Access_Constraints: none Metadata_Use_Constraints: none Metadata_Extensions: Online_Linkage: ://www.esri.com/metadata/esriprof80. Profile_Name: ESRI Metadata Profile