Identification_Information:
  Citation:
    Citation_Information:
      Originator: Day, Warren C.
      Originator: O'Neill, J. Michael
      Originator: Aleinikoff, John N.
      Originator: Green, Gregory N.
      Originator: Saltus, Richard W.
      Originator: Gough, Larry P.

      Publication_Date: 2007
      Title:
        Geologic map of the Big Delta B-1 quadrangle, east-central Alaska
      Geospatial_Data_Presentation_Form: Map and GIS database
      Series_Information:
        Series_Name:
         U.S. Geological Survey Scientific Investigations Map Series
        Issue_Identification: SIM-2975
      Publication_Information:
        Publication_Place: Denver, Colorado
        Publisher: U.S. Geological Survey
      Online_Linkage: http://pubs.usgs.gov/sim/2007/2975

  Description:
    Abstract:
      New 1:63,360-scale geologic mapping of the Big Delta B-1 quadrangle 
      provides important data on the structural setting and age of geologic 
      units, as well as on the timing of gold mineralization and plutonism 
      within the Yukon-Tanana Upland of east-central Alaska.  Gold exploration 
      has remained active throughout the region in response to the discovery of 
      the Pogo gold deposit, which lies just west of the B-1 Big Delta 
      quadrangle.  Geologic mapping and associated geochronological and 
      geochemical studies by the U.S. Geological Survey (USGS) and the Alaska 
      Department of Natural Resources, Division of Mining, Land, and Water, 
      provide baseline data to help understand the regional geologic framework.  
      The Yukon-Tanana Upland lies within the Tintina province in Alaska and 
      consists of Paleozoic and possibly older supracrustal rocks intruded by 
      Paleozoic (Devonian to Mississippian) and Cretaceous plutons.  The oldest 
      rocks in the Big Delta B-1 quadrangle are Paleozoic gneisses of 
      sedimentary origin, forming the protogneiss map units Pzg and Pzgn.  
      Tonalitic to granodioritic plutons invaded the Paleozoic protogneisses 
      during a Devonian-Mississippian orogeny, between 351 and 365 Ma (map units 
      Dag and Dog).  Unit Pzgn retains pre-Mesozoic penetrative fabrics, 
      presumably developed just prior to or during emplacement of the Devonian-
      Mississippian intrusions.  At least some of the rocks in the quadrangle 
      underwent tectonism during the Middle Jurassic (about 188 Ma), and were 
      subsequently deformed in an Early Cretaceous about 130 to 116 Ma.  New U-
      Pb SHRIMP data presented here on zircons from the Paleozoic biotite 
      gneisses record inherited cores that range from 363 Ma to about 2,130 Ma 
      and have rims of euhedral Early Cretaceous metamorphic overgrowths (116+/-
      4 Ma), interpreted to record recrystallization during Cretaceous west-
      northwest-directed thrusting and folding.  U-Pb SHRIMP dating of monazite 
      from a Paleozoic gneiss sample yields an age of 112+/-2 Ma.  The monazite 
      presumably grew during the waning stages of the intense regional 
      Cretaceous ductile deformation.  The Cretaceous ductile deformation was 
      followed closely by granite plutonism and gold mineralization.  The main 
      pulse of Cretaceous plutonism occurred between about 110 and 108 Ma.  
      During this time, the northeast-trending Black Mountain tectonic zone was 
      active as evidenced by the intrusion of the 109 to 108 Ma dioritic dikes 
      (unit Kdi).  The main pulse of gold mineralization is temporally and 
      spatially associated with the Cretaceous Black Mountain tectonic zone, 
      which formed a structural conduit believed to have controlled, in part, 
      emplacement of later units such as the quartz feldspar porphyry (unit 
      Kqfp) in the southeastern part of the quadrangle and the Tertiary volcanic 
      rocks in the northeastern part.

    Purpose:
      This data set was developed to provide digital GIS data for the geologic 
      map of the Big Delta B-1 quadrangle in east-central Alaska.

    Supplemental_Information:
      Any use of trade, product, or firm names is for descriptive purposes only 
      and does not imply endorsement by the U.S. Government.

      Although this Federal Geographic Data Committee-compliant metadata file is 
      intended to document the data set in nonproprietary form, as well as in 
      ARC/INFO format, this metadata file may include some ARC/INFO-specific 
      terminology.

      FILES INCLUDED IN THIS DATA SET:

      ARC/INFO coverages:
      b1geo:     polygon coverage containing geologic contacts and units
      b1flt:     arc coverage containing faults and thrusts
      b1lin:     arc coverage containing lineaments determined from aerial 
                   photographs
      b1dike:    arc coverage containing dikes
      b1fold:    arc coverage containing fold axis
      b1mines:   point coverage containing known mines and prospects
      b1shrimp:  point coverage containing U-Pb SHRIMP age dates
      b1pnt:     point coverage containing strike and dip of foliations, 
                   lineations, and folds information
      b1deco:    arc coverage containing fault decorations

      Base map:
      BD1_base.tif and BD1_base.tfw

  Time_Period_of_Content:
    Time_Period_Information:
      Single_Date/Time:
        Calendar_Date: 2007
    Currentness_Reference: Publication date

  Status:
    Progress: Complete
    Maintenance_and_Update_Frequency: None planned

  Spatial_Domain:
    Bounding_Coordinates:
      West_Bounding_Coordinate: -144.5
      East_Bounding_Coordinate: -144.0
      North_Bounding_Coordinate: 64.5
      South_Bounding_Coordinate: 64.25

  Keywords:
    Theme:
      Theme_Keyword_Thesaurus: AGI Glossary of Geology
      Theme_Keyword: geology
      Theme_Keyword: faults
      Theme_Keyword: contacts
    Place:
      Place_Keyword_Thesaurus: Board of Geographic Names
      Place_Keyword: USA
      Place_Keyword: Alaska
      Place_Keyword: Big Delta B-1

  Access_Constraints: None

  Use_Constraints:
    These data were created with the intent of being used and displayed at a 
    scale of 1:63,360.  Acknowledgment of the USGS would be appropriate in 
    products derived from these data.  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 were approved by the U.S. 
    Geological Survey or the authors of this geologic map database.

  Point_of_Contact:
    Contact_Information:
      Contact_Person_Primary:
        Contact_Person: Warren C. Day
        Contact_Organization: U.S. Geological Survey
      Contact_Position: Geologist, Associate Chief Scientist
      Contact_Address:
        Address_Type: Mailing and physical address
        Address: USGS, Denver Federal Center, P.O. Box 25046, MS 964
        City: Denver
        State_or_Province: CO
        Postal_Code: 80225
        Country: USA
      Contact_Voice_Telephone: 303-236-6484
      Contact_Electronic_Mail_Address: wday@usgs.gov

  Data_Set_Credit:
    GEOLOGIC MAPPING:
    Warren C. Day (U.S. Geological Survey, Denver, CO)
    J.Michael O'Neill (U.S. Geological Survey, Denver, CO)

    DIGITIZATION AND DIGITAL FILE AND DATABASE CREATION:
    Gregory N. Green (U.S. Geological Survey, Denver, CO)

  Native_Data_Set_Environment:
    Microsoft Windows XP Version 5.1 Service Pack 2
    ESRI ArcGIS 9.2

Data_Quality_Information:
  Attribute_Accuracy:
    Attribute_Accuracy_Report:
      Attributes were checked by manually comparing hardcopy plots of the 
      digital data with the source materials, and by completing tests within the 
      software on each of the attribute tables.  Authors and Alex Donatich (USGS 
      map editor) performed separate reviews.

  Logical_Consistency_Report:
    Coverage features were checked visually for overshoots, undershoots, 
    duplications, polygon closures, and other errors by the author that created 
    the digital databases, other report authors, and map editor.  ESRI ArcGIS 
    9.1 (ARC/INFO Workstation) software was used to complete topological 
    cleaning on each of the coverages.  Check plots were reviewed by USGS 
    geologists (authors) and map editor for consistency with basic geologic 
    principles and general conformity to USGS mapping standards.

  Completeness_Report: Data are complete

  Positional_Accuracy:
    Horizontal_Positional_Accuracy:
      Horizontal_Positional_Accuracy_Report:
        Geologic contacts and faults were plotted in the field and from field 
        notes on a topographic mylar base map at a scale of 1:63,360.  The hand-
        drawn map was scanned, georeferenced, and digitized using ArcScan and 
        heads-up digitizing techniques with ESRI ArcGIS 9.1 software.

  Lineage:
    Process_Step:
      Process_Description:
        Numerous field trips involving field mapping and note taking, resulting 
        in a hand-drawn version of the map.
      Process_Date: 2002-2007

    Process_Step:
      Process_Description:
        Field map was scanned, georeferenced, and digitized, and arc (faults, 
        geology, lineament) and polygon (geology) coverages were built.  
        Strucplot database was converted to a point coverage.
      Process_Date: 2006-2007

    Process_Step:
      Process_Description:
        Coverages were attributed and edited as necessary.  Hardcopies of 
        coverages were field-checked.
      Process_Date: 2002-2007

    Process_Step:
      Process_Description:
        Hardcopies were printed for several reviews by authors and map editor.  
        Hardcopies were checked against source materials for accuracy and 
        completeness.
      Process_Date: 2006-2007

    Process_Step:
      Process_Description: 
        Database content was checked for accuracy and completeness.
      Process_Date: 2007

Spatial_Data_Organization_Information:
  Direct_Spatial_Reference_Method: Vector
Spatial_Reference_Information:
  Horizontal_Coordinate_System_Definition:
    Planar:
      Map_Projection:
        Map_Projection_Name: Transverse Mercator
        Transverse_Mercator:
          Scale_Factor_at_Central_Meridian: 0.999600
          Longitude_of_Central_Meridian: -144.250000
          Latitude_of_Projection_Origin: 0.000000
          False_Easting: 0.000000
          False_Northing: 0.000000
      Planar_Coordinate_Information:
        Planar_Coordinate_Encoding_Method: coordinate pair
        Coordinate_Representation:
          Abscissa_Resolution: 0.000064
          Ordinate_Resolution: 0.000064
        Planar_Distance_Units: meters
    Geodetic_Model:
      Horizontal_Datum_Name: North American Datum of 1927
      Ellipsoid_Name: Clarke 1866
      Semi-major_Axis: 6378206.400000
      Denominator_of_Flattening_Ratio: 294.978698

Entity_and_Attribute_Information:
  Overview_Description:
    Entity_and_Attribute_Overview:
      The data set consists of nine coverages:  B1GEO (polygon features 
      representing geologic units and associated linear features bounding 
      geologic unit polygons),B1FLT (linear features representing faults 
      and thrusts), B1LIN (lineaments determined by aerial photographs), B1DIKE 
      (field mapped dikes), B1FOLD (mapped folds), B1PNT (point features 
      representing strike and dip attitudes of foliation, lineations, and 
      folds), B1MINES  (point features of mines and prospects), B1SHRIMP (point 
      features representing radiometric age date sample locality), and B1DECO 
      (polygon decoration coverage of arrows, bars, balls, and thrust fault teeth).
 

      All data files were created using ESRI ArcGIS 9.1 (ARC/INFO module), and
      edited later in ESRI ArcGIS 9.1 (ARC/INFO module).  Consequently, they
      contain a number of fields that are created and maintained specifically
      for those software packages.  The actual field characteristics are as
      follows:

      Arc features of the B1GEO coverage (CONT_TYPE indicates type of contact.  
      CONT_NUM is an integer index corresponding to type of contact):

      COLUMN   ITEM NAME   WIDTH   OUTPUT   TYPE   No.DEC
      1        FNODE#        4       5       BIN    --
      5        TNODE#        4       5       BIN    --
      9        LPOLY#        4       5       BIN    --
      13       RPOLY#        4       5       BIN    --
      17       LENGTH        8      12       FL     3
      21       B1GEO#        4       5       BIN    --
      25       B1GEO-ID      4       5       BIN    --
      29       CONT_TYPE    30      30       CHAR   --
      59       CONT_NUM      2       6       BIN    --

      Field value of arc features of the B1GEO coverage:

      FREQUENCY   CONT_TYPE                       CONT_NUM
      1329        Contact, Certain                1
      26          Contact, Inferred               2
      16          Contact, Concealed              3
      133         Map Boundary                    4
      170         Contact, Coincident with Fault  5
      2           Contact, Inferred and Queried   6

      Arc features of the B1FLT coverage (FAULT_TYPE indicates type of fault or
      thrust; FAULT_NUM is an integer index corresponding to type of fault or
      thrust):

      COLUMN   ITEM NAME   WIDTH   OUTPUT   TYPE   No.DEC
      1        FNODE#        4       5       BIN    --
      5        TNODE#        4       5       BIN    --
      9        LPOLY#        4       5       BIN    --
      13       RPOLY#        4       5       BIN    --
      17       LENGTH        8      12       FL      3
      21       B1FLT#        4       5       BIN    --
      25       B1FLT-ID      4       5       BIN    --
      29       FAULT_TYPE   50      50       CHAR   --
      79       FAULT_NUM     2       5       BIN    --

      Field value of arc features of the B1FLT coverage:

      FREQUENCY   FAULT_TYPE                    FAULT_NUM
      422         Fault, Certain                 1
      64          Fault, Inferred                2
      301         Fault, Concealed               3
      8           Thrust, Certain                4
      9           Thrust, Concealed              5
      56          Strike-Slip, Certain           6
      6           Strike-Slip, Inferred          7
      111         Strike-Slip, Concealed         8

      Arc features of the B1LIN lineament coverage (LIN_TYPE indicates type
      of line feature; LIN_NUM is an integer index corresponding to type of
      lineament):

      COLUMN   ITEM NAME   WIDTH   OUTPUT   TYPE   No.DEC
      1        FNODE#       4       5       BIN    --
      5        TNODE#       4       5       BIN    --
      9        LPOLY#       4       5       BIN    --
      13       RPOLY#       4       5       BIN    --
      17       LENGTH       8      12       FL     3
      21       B1LIN#       4       5       BIN    --
      25       B1LIN-ID     4       5       BIN    --
      29       LIN_TYPE    50      50       CHAR   --
      79       LIN_NUM      2       5       BIN    --

      Field value of arc features of the B1LIN lineament coverage:

      FREQUENCY   LIN_TYPE                        LIN_NUM
      998         Lineament                       1


      Arc features of the B1DIKE coverage (DIKE_TYPE indicates type
      of line feature; DIKE_NUM is an integer index corresponding to type of
      dike):

      COLUMN   ITEM NAME   WIDTH   OUTPUT   TYPE   No.DEC
      1        FNODE#       4       5       BIN    --
      5        TNODE#       4       5       BIN    --
      9        LPOLY#       4       5       BIN    --
      13       RPOLY#       4       5       BIN    --
      17       LENGTH       8      12       FL     3
      21       B1LIN#       4       5       BIN    --
      25       B1LIN-ID     4       5       BIN    --
      59       DIKE_TYPE   30      30       CHAR   --
      61       DIKE_NUM     2       6       BIN    --

      Field value of arc features of the B1DIKE coverage:

      FREQUENCY   DIKE_TYPE                       DIKE_NUM
      4           Trd, rhyolite dikes             1
      8           Tb, basalt dikes                2
      21          Kpeg, pegmatitic dikes          3
      30          Kqfp, quartz-feldspar porphyry  4
      1           Kdi, diorite dikes              5

      Arc features of the B1FOLD coverage (FOLD_TYPE indicates type
      of line feature; DIKE_NUM is an integer index corresponding to type of
      fold):

      COLUMN   ITEM NAME   WIDTH   OUTPUT   TYPE   No.DEC
      1        FNODE#       4       5       BIN    --
      5        TNODE#       4       5       BIN    --
      9        LPOLY#       4       5       BIN    --
      13       RPOLY#       4       5       BIN    --
      17       LENGTH       8      12       FL     3
      21       B1LIN#       4       5       BIN    --
      25       B1LIN-ID     4       5       BIN    --
      59       AXIS_TYPE   30      30       CHAR   --
      61       AXIS_NUM     2       6       BIN    --

      Field value of arc features of the B1FOLD coverage:

      FREQUENCY   AXIS_TYPE                       AXIS_NUM
      3           Synform, Certain                1
      1           Synform, Inferred               2
      2           Synform, Concealed              3
      3           Antiform, Certain               4
      1           Antiform, Concealed             6

      Polygon features of the B1GEO coverage (UNIT_SYMBO indicates geologic
      unit symbol; UNIT_NAME describes type of geologic unit; CMYK is shadeset 
      color for the Arcplot polygonshades command):

      COLUMN   ITEM NAME   WIDTH   OUTPUT   TYPE   No.DEC
      1        AREA         8      12       FL      3
      5        PERIMETER    8      12       FL      3
      9        B1GEO#       4       5       BIN    --
      13       B1GEO-ID     4       5       BIN    --
      17       UNIT_SYMBO  50      15       CHAR   --
      67       UNIT_NAME   50      50       CHAR   --
      117      CMYK         3       3       INT

      Field value of polygon features of the B1GEO coverage:
      
      FREQUENCY   UNIT_SYMBO   UNIT_NAME
      5           Qfp          Flood-plain deposits
      53          Qaf          Alluvial and fluvial deposits
      42          Qc           Colluvium
      48          Qfy          Young alluvial fan deposits
      8           Qls          Landslide deposits
      24          Qsl          Solifluction deposits
      5           Qd           Debris flow deposits
      8           Qt           Terrace deposits
      28          Qfo          Old alluvial fan deposits
      8           Qm           Glacial moraine deposits
      9           Tg           Gravel-rich terrace deposits
      9           Tr           Rhyolite
      3           Kg           Biotite granite
      3           Kqfp         Quartz-feldspar porphyry
      3           Kgcd         Granitoid dikes and plugs
      15          Kdi          Diorite dikes
      17          Kbm          Black Mountain intrusion
      14          Kgb          Main intrusive phase of Goodpaster batholith
      2           Kgbf         Early intrusive phase of Goodpaster batholith
      18          Kgmh         Granitic rocks of Mount Harper batholith
      11          Kgtc         Granite of Tibbs Creek
      4           Kgbr         Granodiorite of Brink intrusion
      14          Dag          Augen gneiss of Central Creek
      3           Dog          Biotite orthogneiss
      1           Pzam         Amphibolite gneiss
      1           Pzq          Quartzite and metapelite
      25          Pzgn         Biotitesillimanite gneiss
      14          Pzg          Biotite gneiss
      13          Shear zone   Shear zone
  
      Point features of the B1PNT coverage
      FIELD_NO is a unique alphanumeric identification for each field locality;
      MAP_UNIT is mapped unit where data recorded;
      COMMENT is miscellaneous notes recorded in the field;
      S1_STRIKE is strike in degrees;
      S1_DIP is dip in degrees;
      L_TREND is lineation trend in degrees;
      L_PLUNGE is lineation plunge in degrees;
      F_1_TREND is F1 fold trend in degrees;
      F_1_PLUNGE is F1 fold plunge in degrees;
      SFO_NUM, BEAR_NUM, and FOLD_NUM indicates point symbol for use with the
        USGS Spokane Field Office makerset (sfo_marker);
      SFO_STRIKE, BEARING and FOLD_BEARING are ARC/INFO rotation values for
        the ARCPLOT command POINTMARKER;
      POINT_TYPE indicates type of point feature; 
      POINT_NUM is an integer index corresponding to type of point feature

      COLUMN   ITEM NAME     WIDTH   OUTPUT   TYPE   No.DEC
      1        AREA           4      12       FL      3
      5        PERIMETER      4      12       FL      3
      9        B1PNT#         4       5       BIN    --
      13       B1PNT-ID       4       5       BIN    --
      17       FIELD_NO      17      17       CHAR   --
      34       MAP_UNIT      50      50       CHAR   --
      44       COMMENT       60      60       CHAR   --
      104      S1_STRIKE      8      11       FL      0
      112      S1_DIP         4       7       BIN    --
      116      L_TREND        8      10       FL      0
      124      L_PLUNGE       8      11       FL      0
      128      F_1_TREND      8      10       FL      0
      136      F_1_PLUNGE     8      11       FL      0
      140      SFO_NUM        2       5       BIN    --
      142      SFO_STRIKE     8      11       FL      0
      150      BEAR_NUM       2       5       BIN    --
      152      BEARING        8      11       FL      0
      160      FOLD_NUM       2       5       BIN    --
      162      FOLD_BEARING   8      11       FL      0
      170      POINT_TYPE    75      75       CHAR   --
      245      POINT_NUM      2       5       BIN    --

      Field values of point features of the B1PNT coverage:
      SFO_NUM is the SFO_MARKER set font number for foliations; 
      BEAR_NUM is the SFO_MARKER set font number for lineations;
      FOLD_NUM is the SFO_MARKER set font number for minor folds;
      POINT_NUM and POINT_TYPE are used to make some sense out
        of the matrix.
      
      FREQUENCY SFO_NUM BEAR_NUM FOLD_NUM POINT_NUM POINT_TYPE
      57        14       0       0        1          Strike and dip of 
                                                       inclined foliation
      2         15       0       0        2          Strike and dip of 
                                                       vertical foliation
      4          0      60       0        3          Lineation
      64        14      60       0        4          Strike and dip of 
                                                       inclined foliation 
                                                       and lineation
      5          0       0       5        5          Minor fold
      1          0      60       5        6          Minor fold and lineation
      1         15      60       5        7          Minor fold, lineation, 
                                                       and vertical foliation
      1         57      52      70        8          Horizontal foliation and 
                                                       horizontal lineation
      1         14      52       0        9          Strike and dip of 
                                                       inclined foliation and 
                                                       horizontal lineation
      7         26       0       0       10          Strike and dip of 
                                                       inclined joint

      Point features of the B1MINES coverage
      These values are the same as in table 2.
      MOP_NO is the Mine or Prospect number;
      ARDF_NO is the Alaska Reseource Data File number;
      MOP_NAME is the Mine or Prospect name;
      MAIN_COMMOD is the main commodity;
      OTHER_COMMOD is (are) the other commoditie(s) if known;
      ORE_MINERALS is (are) the ore mineral(s) if known;
      DEPOSIT_TYPE is the deposit type;
      SFO_NUM is an integer index to indicate which point symbol to use from the 
        USGS Spokane Field Office makerset (sfo_marker).  Symbol 76 is for placer 
        deposits shown by a crossed shovels; symbol 77 is for lode deposits shown 
        by crossed picks

      COLUMN   ITEM NAME       WIDTH   OUTPUT    TYPE    No.DEC
      1        AREA              4      12       FL       3
      5        PERIMETER         4      12       FL       3
      9        B1MINES#          4       5       BIN      --
      13       B1MINES-ID        4       5       BIN      --
      17       MOP_NO            4       5       BIN
      21       ARDF_NO           9       9       CHAR     --
      30       MOP_NAME         20      20       CHAR
      50       MAIN_COMMOD       5       5       CHAR     --
      55       OTHER_COMMOD     50      50       CHAR     --
      105      ORE_MINERALS    120     120       CHAR     --
      225      DEPOSIT_TYPE     50      50       CHAR     --
      275      SFO_NUM           4       5       BIN      --

      Field values of point features of the B1MINES coverage:
      For these data the DISTRICT is always Goodpaster and the Frequency is 1.  
      SFO_NUM is the SFO_MARKER set font number for mine symbols

      MOP_NO  ARDF_NO  MOP_NAME        MAIN_COMMODS  OTHER_COMMODS  ORE_MINERALS      DEPOSIT_TYPE  SFO_NUM

      1       BD011    Central         Au            unknown        Gold              Placer gold   76
                         Creek
      2       BD022    Last Chance     Au            unknown        Gold              Placer gold   76
                         Creek
      3       BD010    Carrie          Au            Ag; Bi; Cu;    Arsenopyrite;     Vein          77
                         Creek                       Hg; Mo; Pb;    bismuthinite; 
                                                     Sb; Sn; W;     chalcopyrite; 
                                                     Zn             gold; molybdenite; 
                                                                    pyrite; pyrrhotite; 
                                                                    scheelite; sphalerite; 
                                                                    stibnite
      4       BD040    Tibbs          Au            Mo; Pb; Sb      Gold;             Placer gold   76
                         Creek                                      jamesonite; 
                                                                    molybdenite; 
                                                                    stibnite
      5       BD017    Gray Lead      Au            Ag; Cu; Pb;     Arsenopyrite;     Vein          77
                                                    Sb              covellite; 
                                                                    digenite; gold; 
                                                                    jamesonite; pyrite; 
                                                                    stibnite
      6       BD020    Granite        Au            Ag; As; Sb      unknown           Vein          77
                         Creek
      7       BD018    Grizzly        Au            Ag; Cu; Pb;     Arsenopyrite;     Vein          77
                         Bear                       Sb              gold; covellite; 
                                                                    digenite; 
                                                                    jamesonite; pyrite; 
                                                                    stibnite
      8       BD025    Michigan       Au            Ag; Cu; Pb;     Arsenopyrite;     Vein          77
                         Lode                       Sb              covellite; 
                                                                    digenite; gold; 
                                                                    jamesonite; pyrite; 
                                                                    stibnite
      9       BD004    Boulder        Mo            unknown         Molybdenite       Porphyry      77
                         Creek                                                        Mo(?)
      10      BD003    Blue Lead      Au            Ag; Cu; Pb;     Arsenopyrite;     Vein          77
                                                    Sb              covellite; 
                                                                    digenite; gold; 
                                                                    jamesonite; pyrite; 
                                                                    stibnite

      Point features of the B1SHRIMP coverage.
      COLUMN   ITEM NAME        WIDTH   OUTPUT   TYPE   No.DEC
      1        AREA               4       12     FL        3
      5        PERIMETER          4       12     FL        3
      9        B1SHRIMP#          4        5     BIN       --
      13       B1SHRIMP-ID        4        5     BIN       --
      17       SAMPLE_NO          2        6     BIN       --
      34       FIELD_NO          17       17     CHAR      --
      51       UNIT_SYMBO        50       15     CHAR      --
      71       MINERAL           10       10     CHAR      --
      106      CORE/RIM          10       10     CHAR      --
      221      AGE (MA)          20       20     CHAR      --
      241      ROCK_TYPE        100      100     CHAR      --

      Field values of point features of the B1SHRIMP coverage:  
      For these data the MINERAL is always zircon and the Frequency is 1

      SAMPLE_NO   FIELD_NO    MAP_SYMBO   CORE/RIM   AGE (Ma)      ROCK_TYPE
      1           04AD239     Tr          CORE        57.2+/-0.6   Crystal-rich rhyolite
      2           05MO126     Kqfp        CORE        95.4+/-0.9   Megacrystic quartz-feldspar porphyry 
                                                                     dike
      3           05AD353     Kqfp        CORE        99.5+/-0.9   Megacrystic quartz-feldspar porphyry
      4           03AD107     Kbm         CORE       107.6+/-1.2   Nonfoliated biotite granite within Black 
                                                                     Mountain tectonic zone
      5           05AD392     Kdi         CORE       107.9+/-1.1   Nonfoliated diorite dike within Black 
                                                                     Mountain tectonic zone
      6           03AD106     Kdi         CORE       109.0+/-1.1   Porphyritic diorite of Black Mountain
      7           03AD056     Kgmh        CORE       110.1+/-1.0   Foliated biotite granodiorite of Mount 
                                                                     Harper batholith
      8           06AD415     Kgmh        CORE       110.5+/-1.1   Nonfoliated biotite granodiorite of 
                                                                     Mount Harper batholith
      9           06AD431     Kgb         CORE       109.9+/-1.4   Nonfoliated hornblende-biotite 
                                                                     granodiorite of Goodpaster batholith
      10          06MO195     Kgbr        CORE       112.9+/-1.3   Biotite granodiorite of Brink intrusion
      11          03AD105     Dag         RIM        117+/-3       Mylonitic augen gneiss
      12          04AD217     Pzgn        CORE       351+/-3       Biotite granodiorite orthogneiss (Dog) 
                                                                     neosome within unit Pzgn

    Entity_and_Attribute_Detail_Citation: None

Distribution_Information:
  Distributor:
    Contact_Information:
      Contact_Organization_Primary:
        Contact_Organization: U.S. Geological Survey
      Contact_Address:
        Address_Type: Mailing and physical address
        Address: Publishing Service Center 15
        Address: P.O. Box 25046, Federal Center, MS-902
        City: Denver
        State_or_Province: CO
        Postal_Code: 80225-0046
        Country: USA
      Contact_Voice_Telephone: 303-236-5486
  Resource_Description: Scientific Investigations Map 2975
  Distribution_Liability:
    Although these data have been subjected to rigorous review and are 
    substantially complete, they are released on the condition that neither the 
    U.S. Geological Survey nor the Unites States Government may be held liable 
    for any damages resulting from their authorized or unauthorized use.
  Standard_Order_Process:
    Digital_Form:
      Digital_Transfer_Information:
        Format_Name: ARCE, SHP
        Format_Version_Number: ArcGIS v. 9.1
        File_Decompression_Technique:
          .tar.gz--UNIX gzip-compressed TAR 
          file(ARCE files)--use GNU zip and TAR.EXE; .zip--self-extracting
          Window ZIP archive (SHP files)--execute file to extract
      Digital_Transfer_Option:
        Online_Option:
          Computer_Contact_Information:
            Network_Address:
              Network_Resource_Name: http://pubs.usgs.gov/sim/2007/2975/
    Fees: None

Distribution_Information:
  Distributor:
    Contact_Information:
      Contact_Organization_Primary:
        Contact_Organization: U.S. Geological Survey
      Contact_Address:
        Address_Type: Mailing address
        Address: USGS Information Services
        Address: PO Box 25286
        Address: Federal Center
        City: Denver
        State_or_Province: CO
        Postal_Code: 80225-0286
        Country: USA
      Contact_Voice_Telephone: (888) ASK-USGS
  Resource_Description: Scientific Investigations Map 2975
  Distribution_Liability: None
  Standard_Order_Process:
    Non-digital_Form: Available as one printed sheet plus 23-page pamphlet
    Fees: Contact USGS at the address listed above

Metadata_Reference_Information:
  Metadata_Date: 20070813
  Metadata_Contact:
    Contact_Information:
      Contact_Organization_Primary:
        Contact_Organization: U.S. Geological Survey
        Contact_Person: Warren C. Day
      Contact_Address:
        Address_Type: Mailing and physical address
        Address: USGS, Denver Federal Center, PO Box 25046, MS 911
        City: Denver
        State_or_Province: CO
        Postal_Code: 80225
      Contact_Voice_Telephone: 303-236-6484
  Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
  Metadata_Standard_Version: FGDC-STD-001-1998
  Metadata_Access_Constraints: None
  Metadata_Use_Constraints: None
  Metadata_Extensions:
    Online_Linkage: <http://www.esri.com/metadata/esriprof80.html>
    Profile_Name: ESRI Metadata Profile