Identification_Information:
  Citation:
    Citation_Information:
      Originator:
        U.S. Geological Survey

        Cooperating agencies: Montana Bureau of Mines and Geology; Department of Earth Sciences, Montanta State University

        Author or compiler: Karl S. Kellogg and Van S. Williams

      Publication_Date: 19980218

      Title: GEOLOGIC MAP OF THE ENNIS 30 X 60 MINUTE QUADRANGLE, MADISON AND GALLATIN COUNTIES, MONTANA

      Series_Information:
        Series_Name: Open-File Report OF97-851
        Issue_Identification: ~ISSUE_IDENTIFICATION 

      Publication_Information:
        Publication_Place: Denver, Colorado

        Publisher: U.S. Geological Survey

      Online_Linkage: anonymous ftp from greenwood.cr.usgs.gov (136.177.21.122) the files are in the directory named /pub/open-file-reports/ofr-97-0851.

Description:
    Abstract:

    Purpose: Forms part of Montana State Geological Map
    Supplemental_Information:
      Map political location:
      
      Compilation scale: 1:100000
      Geology mapped between 1988 and 1995.  Compilation completed 1997.  Review and revision completed 2000.  Archive files prepared 1/00.

  Time_Period_of_Content:
    Time_Period_Information:
      Single_Date/Time:
        Calendar_Date: 20000131

    Currentness_Reference: publication date

  Status:
    Progress: Complete.

    Maintenance_and_Update_Frequency: Irregular. Mapping is continuing in adjacent areas and a more complete final map of this area may eventually be produced. 

Spatial_Domain:
Bounding_Coordinates:
      West_Bounding_Coordinate:-112
      East_Bounding_Coordinate:-111
      North_Bounding_Coordinate: 45.5
      South_Bounding_Coordinate: 45

  Keywords:
    Theme:
      Theme_Keyword_Thesaurus: Geology
      Theme_Keyword: Geologic map
      Theme_Keyword: Stratigraphy
      Theme_Keyword: Quaternary alluvium
      Theme_Keyword: Bedrock
      Theme_Keyword: Structure

    Place:
      Place_Keyword_Thesaurus: none
      Place_Keyword: Montana
      Place_Keyword: Madison County, Montana
      Place_Keyword: Gallatin County, Montana
      Place_Keyword: Ennis, Montana

  Access_Constraints: none

  Use_Constraints:
    none.  Acknowledgment of the U.S. Geological Survey would be appreciated in products derived from these data.

Data_Quality_Information:
  Attribute_Accuracy:
    Attribute_Accuracy_Report: Data was entered and checked by the geologist who made the observations.

  Logical_Consistency_Report:

    Map elements were visually checked by the author for overshoots, undershoots, duplicate features, and other errors. The report is preliminary and has not been thoroughly reviewed for conformity with U.S. Geological Survey editorial standards and stratigraphic nomenclature.  The map was reviewed by another geologist for consistency  with basic geologic principles and general conformity to USGS mapping standards.

  Completeness_Report:

 This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey editorial standards and stratigraphic nomenclature.  Data is complete: no features were eliminated or generalized.  There is no cross section and the ARC/INFO database lacks a unit properties table, although unit properties are described in the text explanation.  A base map coverage is not included.

  Positional_Accuracy:
    Horizontal_Positional_Accuracy:
      Horizontal_Positional_Accuracy_Report:

        Lines were primarily positioned by interpretation of published preexisting geological mapping, thesis maps, and unpublished geological mapping. Lines were scanned from the basemap using a scanner with the following parameters:

   density = 400 400
   x (in) =
   y (in) =
   output file x pixel limits = 
   output file y pixel limits =
   speed = 100 %
   turbo-optimize = 0
   scan line orientation = 4
   deskew angle = 0.000
   output file size =
   scan time = 
   Invert: OFF
   Mirror: OFF
   basic thresholding  
   speckle size = 0 x 0 pixels
   hole filling size = 0 x 0 pixels
   distortion correction: OFF
   Scan Type: Lineart
   Format   : Image Systems RLC

The scanned lines were vectorized with the CADCORE program.

Additional lines and point observations were added using a digitizer tablet with resolution of 0.001 inch.  Most positions on the map are estimated to be accurate closer than 30 m horizontally.  There is no elevation data in the database.

  Lineage:
    Process_Step:
      Process_Description:

	The scanned lines were edited in DESIGN-CAD and brought into ARC/INFO with the DXFARC command. Two coverages were initially created, one containing polygons, the other containing all other features (labels, fold axes, decorations, etc.).

        The digitized lines were compiled using the GSMCAD public domain program (USGS Open-File Report 96-007).  It was exported to ARC/INFO using the GSMCAD export function to create ARC generate ASCII files and the gsmarc.aml program in ARC to convert the ASCII files to ARC coverages and build polygons.
      Process_Date:

Spatial_Data_Organization_Information:
  Direct_Spatial_Reference_Method: Vector

Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Map_Projection:
        Map_Projection_Name: UNIVERSAL TRANSVERSE MERCATOR
Transverse_Mercator:
          Scale_Factor_at_Central_Meridian: .9999
          Zone: 12       
	  Longitude_of_Central_Meridian:-111
          Latitude_of_Projection_Origin: 0.0
          False_Easting: 0.0
          False_Northing: 0.0

      Planar_Coordinate_Information:
        Planar_Coordinate_Encoding_Method: coordinate pair
        Coordinate_Representation:
          Abscissa_Resolution: 0.001
          Ordinate_Resolution: 0.001
        Planar_Distance_Units: METERS

    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:

      The data is supplied in three formats. The first is a graphics file which can be sent to a plotter, The second is the multi-platform SDTS format, and the third is a UNIX based ARC/INFO format.

Available with all of this is ennis100.doc, A Word for Windows format text file which contains a complete Description of Map Units.

           DATA STRUCTURE - GRAPHICS
====================================

      A postscript file ennis.eps created from an ARC/INFO graphics file.  This file was then converted to a printable RTL file using Image Alchemy (v 1.11).

           DATA STRUCTURE - SDTS
====================================
      
      Not available

           DATA STRUCTURE - ARC/INFO 
====================================

      ARC/INFO coverages are available as export files with the root of individual coverages described below and the extension .e00

      The database of the map consists of six coverages (ennis_poly; ennis_line; ennis_text; ennis_dec; ennis_sym; and ennis_dip) and a basemap coverage, ennis_base.  There are also nine additional coverages (ennis_corr; struct_poly; struct_line; struct_dec; struct_anno1; struct_anno2; struct_expln; source_line; source_anno), eleven shade-key and text files (strshd1.key; strshd2.key; source1.key; source2.key; rockshd1.key; rockshd2.key; rockshd3.key; rockline1.key; rockline2.key; acknowledge.key; projection.key) that are used in plotting the marginalia of the map (i.e. a correlation of map units diagram, list of map unit symbols and names, a structure map and explanation of symbols, a source map, a list of references, projection information, and a list of acknowledgements.

      ennis_poly coverage:  Contains all contact lines and labelpoints for each polygon.  The character item LINE_TYPE and the integer item LINE_CODE define the line type which bounds the polygon.  The LINE_SYM item defines the symbol from the alcwrg.lin lineset used to draw the lines. The UNIT_SYM defines the type of polygon using the format of wyo.txt for geologic symbols; Proterozoic(!); Cambrian(_); Pennslyvianian(&); Triassic(@). SHADE_SYM defines the unique color for each polygon.

      ennis_line coverage:  Contains faults, fold axis, and other non-contact lines.  Faults that are contacts also appear in the ennispoly coverage.  The line attributes in ennis_line are the same as those in ennis_poly.

      ennis_text coverage: Contains text poygon labels to appear on the face of the map.  Also includes arcs that draw leaders from the text to the appropriate polygons.  This coverage is for cartographic purposes and does not include data critical to the database information. The UNIT_SYM item defines the text to appear on the map using the wyo.txt format.

      ennis_dec coverage:  Contains lines which decorate faults. This coverage is for cartographic purposes and does not include data critical to the database information.

      ennis_sym coverage: Contains lines which make up symbols which decorate the map.  This coverage is for cartographic purposes and does not include data critical to the database information.
 
      ennis_dip coverage: Contains points associated with ennis_sym coverage.  DIP item defines the dip that appears on the map. 

      ennis_base coverage:  Contains lines vectorized from a scanned image (Ennis, MT 1:100,000-scale topographic sheet).

      ennis_corr coverage: Contains polygons, arcs, and annotation (subclass DXF) for the correlation of map units.

      struct_poly coverage:  Contains all contact lines and labelpoints for each polygon in the Structure Map. GEO_NAME item defines the type of polygon. SHADE_SYM defines the unique color for each polygon.

      struct_line coverage: Contains faults, fold axes and other non-contact lines on the Structure Map. Faults that are contacts also appear in the structpoly coverage. LINE_SYM items defines the significance of the line.

      struct_dec coverage: Contains lines which decorate faults on the Structure Map. This coverage is for cartographic purposes and does not include data critical to the database information.

      struct_anno1 coverage: Contains lines and annotation which describe the Structure Map. . This coverage is for cartographic purposes and does not include data critical to the database information.

      struct_anno2 coverage:  Contains lines and annotation which describe the Structure Map. This coverage is for cartographic purposes and does not include data critical to the database information.

      struct_expln coverage:  Contains lines and text points used to plot the explanation of map symbols for the structure map. This coverage is for cartographic purposes and does not include data critical to the database information.

      source_line coverage: Contains lines which appear on the Sources of Geologic Data Map.

      source_anno coverage: Contains text and leaders which appear on the Sources of Geologic Data Map.

      strshd1.key: ASCII text file used to create the boxes and descriptive text for the Explanation of the Structure Map.

      strshd2.key: ASCII text file used to create the text in the boxes for the Explanation of the Structure Map.

      source1.key: ASCII text file used to list the sources of geologic data.

      source2.key: ASCII text file used to list the sources of geologic data.

      rockshd1.key: ASCII text file used to create the shaded boxes, symbols, and descriptive text for the List of Map Units.

      rockshd2.key: ASCII text file used to create the shaded boxes, symbols, and descriptive text for the List of Map Units.

      rockshd3.key: ASCII text file used to create the shaded boxes, symbols, and descriptive text for the List of Map Units.

      rockline1.key: ASCII text file used to create the line symbol, and descriptive text for the List of Map Units.

      rockline2.key: ASCII text file used to create the line symbol, and descriptive text for the List of Map Units.

      acknowledge.key: ASCII text file used to list credits for work in map compilation.

      projection.key: ASCII text file used to list projection information for the main map.

      The importennis.aml file is included to constitute an ARC/INFO macro language program that will import the data into ARC/INFO coverages from the export (*.e00) format and organize the data into several subdirectories.  The coverages containing data for the main geologic map will be stored into the /covers-map directory.  The covers containing data for the Correlation of map Units will be stored in the /covers-corr directory.  The covers containing the data for the the Source Map will be stored in the /covers-source directory.  The covers containing the data for the Structure Map will be stored in the covers-struct directory.  Images used in the plotting of the map will be moved to the /images directory.  All ASCII key-files will be placed in the /keys directory.  All documentation will be stored in the /Documents directory.

      The drawennis.aml file is included to constitute an ARC/INFO macro language program that will extract information from the ennis coverages to produce a graphics (.gra) file depicting the ennis geologic map.  The graphics file can be viewed on screen or plotted with appropriate equipment.

      The aml program calls shadeset ctr269.shd; textset wyo.txt; linesets alcwrg.lin, plotter.lin, carto.lin, alcgeol.lin; and image cusgs_2_0.tif, so these are also included in the archive file.  Other files can be substituted, but special geologic characters may not plot properly with a different font.

    Entity_and_Attribute_Detail_Citation:

      Database root name: ennis

FEATURES IN THE DATABASE-------------------------

LINE_TYPE             LINE_CODE    LINE_SYM
---------------------------------------------
solid contact            1             25
dashed contact           2             26
dotted contact           3             43
solid fault              4              1
dashed fault             5              3
dotted fault             6             44
solid normal fault       7              1
dashed normal fault      8              3
dotted normal fault      9             44
solid reverse fault     10              1
dashed reverse fault    11              3
dotted reverse fault    12             44
solid thrust fault      13              1
dashed thrust fault     14              3
dotted thrust fault     15             44
detachment fault        16              3
solid fold axis         20             25
dashed fold axis        21             26
dotted fold axis        22             43
dacite sill             30              1
diabase dike            40              1
gabbro sill             50              1
marble                  60              1
water contact           90             25
7.5 min tic marks       98             25
map boundary            99              1

UNIT_SYM    SHADE_SYM  
-----------------------
!Abg          109  
!Abs           71  
!Agg          107  
!Aif          118  
!Amd           88  
!Ams           72  
!Aph           69  
!Ass          155  
!di            99  
&Mqa          246  
Aag           127  
Aam           155  
Abh            97  
Abm           132  
Abs           159  
Agd           201  
Agg            65  
Agn           102  
Agp            85  
Ags           114  
Aif            99  
Ama            84  
Amb            88  
Aq            172  
Aqf            91  
At             67  
Aum           140  
J@ed          125  
J@u           234  
Jm            235  
Kb             50  
Kc            124  
Kd             77  
Kev           120  
Kf            144  
Kgd            75  
Kk            208  
Kl             79  
Kll            82  
Klm            81  
Klu            80  
Kmo           145  
Kmt           164  
Ks             49  
Ktc           122  
Ku            242  
MDtj          250  
Mbs           247  
Ml            252  
Mm            248  
Mmc           240  
O_rm          257  
PMu           244  
Ps            245  
QTbf           62  
Qal             1  
Qcl             2  
Qd             16  
Qf              4  
Qfc            10  
Qg            218  
Qgc             3  
Ql             11  
Qr              7  
Qs             11  
Qt              9  
Qti            37  
TKf            30  
TKg            45  
Tai            22  
Tam            21  
Tas            20  
Tc             25  
Tg             48  
Tht            18  
Ti             34  
Tl             14  
Tls            64  
Ts             12  
Tv             24  
Tvd            23  
Tvr             6  
Tvt            41  
Tvv            24  
_m            228  
_mi           263  
_rp           115  
_u            262  
_wf           266  
water         216  

Distribution_Information:
  Distributor:
    Contact_Information:
      Contact_Organization_Primary:
        Contact_Organization: U.S. Geological Survey, National Cooperative Geologic Mapping Team

      Contact_Address:
        Address_Type: mailing address
        Address: U.S. Geological Survey
        Address: MS 913, Box 25046 DFC
        City: Lakewood
        State_or_Province: CO
        Postal_Code: 80225-0046
      Contact_Voice_Telephone: (303) 236-1289 office
      Contact_Voice_Telephone: (303) 236-7880 secretary

  Distribution_Liability: Although this digital spatial data has been subjected to rigorous review and is substantially complete, it is released on the condition that neither the USGS nor the United States Government may be held liable for any damages resulting from its authorized or unauthorized use.

  Standard_Order_Process:
    Digital_Form:
      Digital_Transfer_Information:
        Format_Name: 
        Format_Version_Number: all
        Format_Version_Date: 199
        File_Decompression_Technique:
      Digital_Transfer_Option:
        Online_Option:
          Computer_Contact_Information:
            Network_Address:
              Network_Resource_Name: http://ncgmp.cr.usgs.gov/ncgmp/lvuc/
              Network_Resource_Name: http://greenwood.cr.usgs.gov
    Fees: none

Metadata_Reference_Information:
  Metadata_Date: 19980217
  Metadata_Review_Date:
  Metadata_Contact:
    Contact_Information:
      Contact_Person_Primary:
        Contact_Person: Karl S. Kellog
        Contact_Organization: U.S. Geological Survey, National Cooperative Geologic Mapping Team

      Contact_Address:
        Address_Type: mailing address
        Address: U.S. Geological Survey
        Address: MS 913, Box 25046 DFC
        City: Lakewood
        State_or_Province: CO
        Postal_Code: 80225-0046
      Contact_Voice_Telephone: (303) 236-1305 office
      Contact_Voice_Telephone: (303) 236-7880 secretary

  Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
  Metadata_Standard_Version: 19940608