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The Upper Midwest States: Minnesota, Wisconsin, Michigan, Illinois and Indiana - The State of Minnesota

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Title:
The Upper Midwest States: Minnesota, Wisconsin, Michigan, Illinois and Indiana - The State of Minnesota
Abstract:
These metadata are specifically for the State of Minnesota, one state in the national compilation of state geologic map databases. The digital geologic map data was prepared by the Minnesota Geological Survey. Subsequent editing of the spatial data by the USGS was limited to fitting a standardized state boundary to the data, standardizing the arc coding, reprojecting the data, and minor edits of arc or polygon attributes to conform with the paper map. This open-file report is one of several that present the preliminary results of the USGS Mineral Resources Program activity to compile a national-scale geologic map database to support national and regional level projects, including mineral resource and geoenvironmental assessments. The only comprehensive sources of regional- and national-scale geologic maps are state geologic maps with scales ranging from 1:100,000 to 1:1,000,000. Digital versions of these state maps form the core of what is presented here. Because no adequate geologic map exists for the state of Alaska, it is being compiled in regional blocks that also form part of this national database. It is expected that this series will completed by approximately the end of 2007. These maps and databases are being released in blocks of states or, in the case of Alaska, as compiled blocks of 1:250,000-scale quadrangles as chapters in this series. For Alaska, formal maps as well as databases are being published here, whereas for the conterminous U.S. only state databases and preview graphics are presented, because published maps for most states already exist. For Alaska these regional compilations will form the base for compiling a new geologic map of the state. As documented in CONUSdocumentationMW.pdf, standards for the conterminous U.S. are somewhat different than those for Alaska and Hawaii.
Supplemental_Information:
This database consists of five major Arc/Info GIS datasets for each state; - one: geologic map with formations, - two: faults (where present), - three: dikes (where present), - four: miscellaneous line features (where present), - five: miscellaneous point features (where present).

  1. How might this data set be cited?
    Nicholson, Suzanne W., Dicken, Connie L., Foose, Michael P., and Mueller, Julia A.L., 2004, The Upper Midwest States: Minnesota, Wisconsin, Michigan, Illinois and Indiana - The State of Minnesota: U.S. Geological Survey Open-File Report 2004-1355, U.S. Geological Survey, Reston, VA.

    Online Links:

    This is part of the following larger work.

    Nicholson, Suzanne W., Dicken, Connie L., Foose, Michael P., and Mueller, Julia A.L., 2004, Integrated geologic map databases for the United States: The Upper Midwest States: Minnesota, Wisconsin, Michigan, Illinois and Indiana: U.S. Geological Survey Open-File Report 1355, U.S. Geological Survey, Reston, VA.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -97.46778957
    East_Bounding_Coordinate: -89.29920073
    North_Bounding_Coordinate: 49.44109356
    South_Bounding_Coordinate: 43.16891796
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 2004Currentness_Reference: publication date
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: map
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
      This is a Vector data set.
    2. What coordinate system is used to represent geographic features?
      The map projection used is Lambert Conformal Conic.
      Projection parameters:
      Standard_Parallel: 33
      Standard_Parallel: 45
      Longitude_of_Central_Meridian: -100.0
      Latitude_of_Projection_Origin: 0
      False_Easting: 0.00000
      False_Northing: 0.00000
      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 0.01
      Ordinates (y-coordinates) are specified to the nearest 0.01
      Planar coordinates are specified in Meters
      The horizontal datum used is North American Datum of 1927.
      The ellipsoid used is Clarke 1866.
      The semi-major axis of the ellipsoid used is 6378206.4.
      The flattening of the ellipsoid used is 1/294.98.
  7. How does the data set describe geographic features?
    mn_geol.pat
    Polygon attribute table for the Minnesota geologic coverage. (Source: ESRI)
    orig_label
    unmodified map unit symbol from source cover. (Source: Doug Stoeser)
    ValueDefinition
    AdgDeer Lake sequence and upper part of the Newton Lake Formation
    AgbMentor mafic complex
    AgdPost-Algoman intermediate intrusions
    AgmAlgoman granite-rich migmatite
    AgrSyntectonic to pre-Algoman granitoid rocks
    AmgMiddle Archean and older rocks
    AmiPost-Algoman mafic intrusions
    AmmLate Archean mixed metavolcanic rocks
    AmsLate Archean metasedimentary rocks, undivided
    AmvLate Archean mafic metavolcanic rocks
    ApsParagneiss, schist, and amphibolite
    AqzLate Archean felsic to intermediate volcanic rocks
    AsmParagneiss and schist-rich migmatite
    AstSaganaga Tonalite of northeastern Minnesota
    CuUpper Cambrian, undivided
    DcChicksaw Member of the Little Cedar Formation (Cedar Valley Group)
    DlLithograph City Formation, Coralville Formation and Hinckle and Eagle City Members of the Little Cedar Formation (Cedar Valley Group), undivided
    DuDevonian rocks, undivided
    DwBassett Member of the Little Cedar Formation (Cedar Valley Group) and Pinicon Ridge and Spillville Formations (Wapsipinicon Group)
    JJurassic rocks, undivided
    KcColeraine Formation
    KuCretaceous rocks, undivided
    OlLower Ordovician rocks, undivided
    OmMiddle Ordovician rocks, undivided
    OmdDecorah Shale (Middle Ordovician)
    OmuMiddle and Upper Ordovician rocks, undivided
    OumUpper and Middle Ordovician rocks, undivided
    PedqDenham Formation
    PedvMetabasalt, metadiabase, and metasedimentary rocks metamorphosed to lower greenschist facies
    PegShale, siltstone, feldspathic graywacke, and associated volcaniclastic rocks [of the Animikie Group]
    PegdSyntectonic intrusions of the Penokean orogen
    PegrLate-tectonic intrusions of the Penokean orogen
    PegsGraphitic schist, phyllite and slate interbedded on a fine scale [in the Mille Lacs Group and related rocks of the Penokean fold-and-thrust belt]
    PegvGraphitic schist, slate, and silicate iron-formation metamorphosed to the lower greenschist facies and related conditions
    PeifIron-formation [of the Animikie Group]
    PelfQuartz-rich slate, argillite, and schist in the northwestward extent of the unit and coarse-grained megacrystic garnet-staurolite-schist in the southwestward extent [in the Little Falls Formation]
    PemMetadiabase, undivided [of the Mille Lacs Group and related rocks of the Penokean fold-and-thrust belt]
    PemqQuartz arenite, siltstone, and chert-rich dolostone of the Trout Lake Formation in Crow Wing County [of the Mille Lacs Group and related rocks of the Penokean fold-and-thrust belt]
    PemtUnnamed schistose, volcanic, and hypabyssal rocks of mafic composition and volcanic, volcaniclastic, and intrusive rocks of felsic composition
    PenmMahnomen Formation [of the North Range Group]
    PenrRabbit Lake Formation [of the North Range Group]
    PentTrommald Formation [of the North Range Group]
    PeopPost-tectonic intrusions of the Penokean orogen
    PepsMetagraywacke, metasiltstone, and a variety of schistose rocks metamorphosed to the amphibolite grade [of the Mille Lacs Group and related rocks of the Penokean fold-and-thrust belt]
    PeqPokegama Quartzite
    PeqdQuartzite at Dam Lake [of the Mille Lacs Group and related rocks of the Penokean fold-and-thrust belt]
    PesSioux Quartzite
    PesaSlate, argillite, and metasiltstone metamorphosed to the lower greenschist facies [of the Mille Lacs Group and related rocks of the Penokean fold-and-thrust belt]
    PevdMetabasalt, metadiabase, and metasedimentary rocks metamorphosed to lower amphibolite facies [of the Mille Lacs Group and related rocks of the Penokean fold-and-thrust belt]
    PmaAnorthositic series of the Duluth Complex
    PmbgSelected granophyric and leuco-granitic phases of troctolitic-gabbroic intrusions in the Beaver Bay Complex [in Subvolcanic rocks, undivided]
    PmbuBeaver Bay Complex and other named and unnamed gabbroic-troctolitic intrusions [of Subvolcanic mafic rocks, undivided]
    PmcChengwatana Volcanic Group
    PmdgFelsic series of the Duluth Complex
    PmfFond du Lac Formation
    PmgEarly gabbros [of the Duluth Complex]
    PmhHinckley Sandstone
    PmlLogan Intrusions
    PmnnNormally polarized volcanic rocks, undivided [of the North Shore Volcanic Group]
    PmnpSchroeder-Lutsen basalts [of the North Shore Volcanic Group]
    PmnrReversely polarized volcanic rocks, undivided [of the North Shore Volcanic Group]
    PmsSolor Church Formation
    PmtTroctolitic and gabbroic cumulate rocks [of the Duluth Complex]
    sgmc_label
    orig_label + ;n where n= province number (n=0 if no province number) (Source: Doug Stoeser)
    ValueDefinition
    Adg;0Deer Lake sequence and upper part of the Newton Lake Formation
    Agb;0Mentor mafic complex
    Agd;0Post-Algoman intermediate intrusions
    Agm;0Algoman granite-rich migmatite
    Agr;0Syntectonic to pre-Algoman granitoid rocks
    Amg;0Middle Archean and older rocks
    Ami;0Post-Algoman mafic intrusions
    Amm;0Late Archean mixed metavolcanic rocks
    Ams;0Late Archean metasedimentary rocks, undivided
    Amv;0Late Archean mafic metavolcanic rocks
    Aps;0Paragneiss, schist, and amphibolite
    Aqz;0Late Archean felsic to intermediate volcanic rocks
    Asm;0Paragneiss and schist-rich migmatite
    Ast;0Saganaga Tonalite of northeastern Minnesota
    Cu;0Upper Cambrian, undivided
    Dc;0Chicksaw Member of the Little Cedar Formation (Cedar Valley Group)
    Dl;0Lithograph City Formation, Coralville Formation and Hinckle and Eagle City Members of the Little Cedar Formation (Cedar Valley Group), undivided
    Du;0Devonian rocks, undivided
    Dw;0Bassett Member of the Little Cedar Formation (Cedar Valley Group) and Pinicon Ridge and Spillville Formations (Wapsipinicon Group)
    Ju;0Jurassic rocks, undivided
    Kc;0Coleraine Formation
    Ku;0Cretaceous rocks, undivided
    Ol;0Lower Ordovician rocks, undivided
    Om;0Middle Ordovician rocks, undivided
    Omd;0Decorah Shale (Middle Ordovician)
    Omu;0Middle and Upper Ordovician rocks, undivided
    Oum;0Upper and Middle Ordovician rocks, undivided
    PRedq;0Denham Formation
    PRedv;0Metabasalt, metadiabase, and metasedimentary rocks metamorphosed to lower greenschist facies
    PReg;0Shale, siltstone, feldspathic graywacke, and associated volcaniclastic rocks [of the Animikie Group]
    PRegd;0Syntectonic intrusions of the Penokean orogen
    PRegr;0Late-tectonic intrusions of the Penokean orogen
    PRegs;0Graphitic schist, phyllite and slate interbedded on a fine scale [in the Mille Lacs Group and related rocks of the Penokean fold-and-thrust belt]
    PRegv;0Graphitic schist, slate, and silicate iron-formation metamorphosed to the lower greenschist facies and related conditions
    PReif;0Iron-formation [of the Animikie Group]
    PRelf;0Quartz-rich slate, argillite, and schist in the northwestward extent of the unit and coarse-grained megacrystic garnet-staurolite-schist in the southwestward extent [in the Little Falls Formation]
    PRem;0Metadiabase, undivided [of the Mille Lacs Group and related rocks of the Penokean fold-and-thrust belt]
    PRemq;0Quartz arenite, siltstone, and chert-rich dolostone of the Trout Lake Formation in Crow Wing County [of the Mille Lacs Group and related rocks of the Penokean fold-and-thrust belt]
    PRemt;0Unnamed schistose, volcanic, and hypabyssal rocks of mafic composition and volcanic, volcaniclastic, and intrusive rocks of felsic composition
    PRenm;0Mahnomen Formation [of the North Range Group]
    PRenr;0Rabbit Lake Formation [of the North Range Group]
    PRent;0Trommald Formation [of the North Range Group]
    PReop;0Post-tectonic intrusions of the Penokean orogen
    PReps;0Metagraywacke, metasiltstone, and a variety of schistose rocks metamorphosed to the amphibolite grade [of the Mille Lacs Group and related rocks of the Penokean fold-and-thrust belt]
    PReq;0Pokegama Quartzite
    PReqd;0Quartzite at Dam Lake [of the Mille Lacs Group and related rocks of the Penokean fold-and-thrust belt]
    PRes;0Sioux Quartzite
    PResa;0Slate, argillite, and metasiltstone metamorphosed to the lower greenschist facies [of the Mille Lacs Group and related rocks of the Penokean fold-and-thrust belt]
    PRevd;0Metabasalt, metadiabase, and metasedimentary rocks metamorphosed to lower amphibolite facies [of the Mille Lacs Group and related rocks of the Penokean fold-and-thrust belt]
    PRma;0Anorthositic series of the Duluth Complex
    PRmbg;0Selected granophyric and leuco-granitic phases of troctolitic-gabbroic intrusions in the Beaver Bay Complex [in Subvolcanic rocks, undivided]
    PRmbu;0Beaver Bay Complex and other named and unnamed gabbroic-troctolitic intrusions [of Subvolcanic mafic rocks, undivided]
    PRmc;0Chengwatana Volcanic Group
    PRmdg;0Felsic series of the Duluth Complex
    PRmf;0Fond du Lac Formation
    PRmg;0Early gabbros [of the Duluth Complex]
    PRmh;0Hinckley Sandstone
    PRml;0Logan Intrusions
    PRmnn;0Normally polarized volcanic rocks, undivided [of the North Shore Volcanic Group]
    PRmnp;0Schroeder-Lutsen basalts [of the North Shore Volcanic Group]
    PRmnr;0Reversely polarized volcanic rocks, undivided [of the North Shore Volcanic Group]
    PRms;0Solor Church Formation
    PRmt;0Troctolitic and gabbroic cumulate rocks [of the Duluth Complex]
    unit_link
    composite map label = ST + sgmc_label This creates a unique identifier for every unit in the CONUS (continental United States) covers. (Source: Doug Stoeser)
    ValueDefinition
    MNAdg;0Deer Lake sequence and upper part of the Newton Lake Formation
    MNAgb;0Mentor mafic complex
    MNAgd;0Post-Algoman intermediate intrusions
    MNAgm;0Algoman granite-rich migmatite
    MNAgr;0Syntectonic to pre-Algoman granitoid rocks
    MNAmg;0Middle Archean and older rocks
    MNAmi;0Post-Algoman mafic intrusions
    MNAmm;0Late Archean mixed metavolcanic rocks
    MNAms;0Late Archean metasedimentary rocks, undivided
    MNAmv;0Late Archean mafic metavolcanic rocks
    MNAps;0Paragneiss, schist, and amphibolite
    MNAqz;0Late Archean felsic to intermediate volcanic rocks
    MNAsm;0Paragneiss and schist-rich migmatite
    MNAst;0Saganaga Tonalite of northeastern Minnesota
    MNCu;0Upper Cambrian, undivided
    MNDc;0Chicksaw Member of the Little Cedar Formation (Cedar Valley Group)
    MNDl;0Lithograph City Formation, Coralville Formation and Hinckle and Eagle City Members of the Little Cedar Formation (Cedar Valley Group), undivided
    MNDu;0Devonian rocks, undivided
    MNDw;0Bassett Member of the Little Cedar Formation (Cedar Valley Group) and Pinicon Ridge and Spillville Formations (Wapsipinicon Group)
    MNJu;0Jurassic rocks, undivided
    MNKc;0Coleraine Formation
    MNKu;0Cretaceous rocks, undivided
    MNOl;0Lower Ordovician rocks, undivided
    MNOm;0Middle Ordovician rocks, undivided
    MNOmd;0Decorah Shale (Middle Ordovician)
    MNOmu;0Middle and Upper Ordovician rocks, undivided
    MNOum;0Upper and Middle Ordovician rocks, undivided
    MNPRedq;0Denham Formation
    MNPRedv;0Metabasalt, metadiabase, and metasedimentary rocks metamorphosed to lower greenschist facies
    MNPReg;0Shale, siltstone, feldspathic graywacke, and associated volcaniclastic rocks [of the Animikie Group]
    MNPRegd;0Syntectonic intrusions of the Penokean orogen
    MNPRegr;0Late-tectonic intrusions of the Penokean orogen
    MNPRegs;0Graphitic schist, phyllite and slate interbedded on a fine scale [in the Mille Lacs Group and related rocks of the Penokean fold-and-thrust belt]
    MNPRegv;0Graphitic schist, slate, and silicate iron-formation metamorphosed to the lower greenschist facies and related conditions
    MNPReif;0Iron-formation [of the Animikie Group]
    MNPRelf;0Quartz-rich slate, argillite, and schist in the northwestward extent of the unit and coarse-grained megacrystic garnet-staurolite-schist in the southwestward extent [in the Little Falls Formation]
    MNPRem;0Metadiabase, undivided [of the Mille Lacs Group and related rocks of the Penokean fold-and-thrust belt]
    MNPRemq;0Quartz arenite, siltstone, and chert-rich dolostone of the Trout Lake Formation in Crow Wing County [of the Mille Lacs Group and related rocks of the Penokean fold-and-thrust belt]
    MNPRemt;0Unnamed schistose, volcanic, and hypabyssal rocks of mafic composition and volcanic, volcaniclastic, and intrusive rocks of felsic composition
    MNPRenm;0Mahnomen Formation [of the North Range Group]
    MNPRenr;0Rabbit Lake Formation [of the North Range Group]
    MNPRent;0Trommald Formation [of the North Range Group]
    MNPReop;0Post-tectonic intrusions of the Penokean orogen
    MNPReps;0Metagraywacke, metasiltstone, and a variety of schistose rocks metamorphosed to the amphibolite grade [of the Mille Lacs Group and related rocks of the Penokean fold-and-thrust belt]
    MNPReq;0Pokegama Quartzite
    MNPReqd;0Quartzite at Dam Lake [of the Mille Lacs Group and related rocks of the Penokean fold-and-thrust belt]
    MNPRes;0Sioux Quartzite
    MNPResa;0Slate, argillite, and metasiltstone metamorphosed to the lower greenschist facies [of the Mille Lacs Group and related rocks of the Penokean fold-and-thrust belt]
    MNPRevd;0Metabasalt, metadiabase, and metasedimentary rocks metamorphosed to lower amphibolite facies [of the Mille Lacs Group and related rocks of the Penokean fold-and-thrust belt]
    MNPRma;0Anorthositic series of the Duluth Complex
    MNPRmbg;0Selected granophyric and leuco-granitic phases of troctolitic-gabbroic intrusions in the Beaver Bay Complex [in Subvolcanic rocks, undivided]
    MNPRmbu;0Beaver Bay Complex and other named and unnamed gabbroic-troctolitic intrusions [of Subvolcanic mafic rocks, undivided]
    MNPRmc;0Chengwatana Volcanic Group
    MNPRmdg;0Felsic series of the Duluth Complex
    MNPRmf;0Fond du Lac Formation
    MNPRmg;0Early gabbros [of the Duluth Complex]
    MNPRmh;0Hinckley Sandstone
    MNPRml;0Logan Intrusions
    MNPRmnn;0Normally polarized volcanic rocks, undivided [of the North Shore Volcanic Group]
    MNPRmnp;0Schroeder-Lutsen basalts [of the North Shore Volcanic Group]
    MNPRmnr;0Reversely polarized volcanic rocks, undivided [of the North Shore Volcanic Group]
    MNPRms;0Solor Church Formation
    MNPRmt;0Troctolitic and gabbroic cumulate rocks [of the Duluth Complex]
    source
    reference to the source used (Source: Doug Stoeser)
    ValueDefinition
    MN001Morey, G.B., and Meints, Joyce, 2000, Geologic map of Minnesota - Bedrock Geology: Minnesota Geological Survey, State Map Series, S-20, 3rd edition, scale 1:1,000,000. available on line at: http://www.geo.umn.edu/mgs/currentpubs.htm
    unit_age
    The geologic age from the source map used. (Source: Doug Stoeser)
    ValueDefinition
    Cretaceous 
    Devonian 
    Early Proterozoic 
    Jurassic 
    Late Archean 
    Late Cambrian 
    Late and Middle Ordovician 
    Lower Ordovician 
    Middle Ordovician 
    Middle Proterozoic 
    Middle and Late Ordovician 
    Middle to Early Archean 
    rocktype1
    The predominant lithology found in the formation. (Source: unit classification)
    ValueDefinition
    anorthosite 
    arenite 
    basalt 
    claystone 
    conglomerate 
    diabase 
    dolostone (dolomite) 
    felsic volcanic rock 
    gabbro 
    gneiss 
    granite 
    graywacke 
    iron formation 
    limestone 
    mafic metavolcanic rock 
    monzonite 
    mudstone 
    paragneiss 
    pyroxenite 
    quartzite 
    sandstone 
    schist 
    shale 
    slate 
    tonalite 
    troctolite 
    water 
    rocktype2
    The second most predominant lithology in the formation. (Source: unit classification)
    ValueDefinition
    amphibolite 
    arenite 
    argillite 
    conglomerate 
    diabase 
    diorite 
    dolostone (dolomite) 
    felsic metavolcanic rock 
    felsic volcanic rock 
    gabbro 
    granodiorite 
    graywacke 
    limestone 
    migmatite 
    monzodiorite 
    peridotite 
    phyllite 
    rhyolite 
    sandstone 
    schist 
    sedimentary rock 
    shale 
    siltstone 
    slate 
    trachybasalt 
    troctolite 
    water 
    in_geol.aat
    Arc attribute table for Minnesota geologic coverage. (Source: ESRI)
    arc-code
    Unique identifier for the line feature (Source: AAT data dictionary)
    ValueDefinition
    1contact, location certain
    7shoreline or riverbank
    12thrust fault, location inferred, queried, teeth on right from origin
    32fault, sense of displacement unknown or undefined, location inferred or queried
    124state boundary
    125international boundary
    arc-para1
    Used for "decorated" lines where additional information is needed. (Source: AAT data dictionary)
    ValueDefinition
    0no additional information
    1for normal faults, upthrown side is to the right
    arc-para2
    "Scratch" field used mostly in Alaska. (Source: AAT data dictionary)
    ValueDefinition
    0no additional information
    source
    A coded reference citation indicating source material used. (Source: AAT data dictionary)
    ValueDefinition
    MN001Morey, G.B., and Meints, Joyce, 2000, Geologic map of Minnesota - Bedrock Geology: Minnesota Geological Survey, State Map Series, S-20, 3rd edition, scale 1:1,000,000. available on line at: http://www.geo.umn.edu/mgs/currentpubs.htm
    US001Johnson, Bruce R. and Leveritch, Beth, 1998, 1:100,000 Scale State Boundaries of the Conterminous United States: U.S. Geological Survey, unpublished (see metadata file: st100kmeta.txt, CONUSdocumentationMW.pdf)
    Entity_and_Attribute_Overview:
    Coding for polygon attributes:

    NAME: FEATURE: orig_label unmodified map unit symbols from source cover sgmc_label orig_label modified for standard geologic age symbols and an integer code added for province unit_link sgmc_label and a state code identifier source reference to source of data unit_age geologic age rocktype1 predominant lithology rocktype2 second most predominant lithology

    Coding for arc attributes:

    NAME: FEATURE: arc-code unique integer identifier arc-para1 used where additional information is needed arc-para2 scratch field source reference to source of data

    Coding for point attributes:

    NAME: FEATURE: point_feature name of feature on map source reference to source of data

    Coding for dikes (special arcs) attributes:

    NAME: FEATURE: orig_label unmodified map unit symbols from source cover sgmc_label orig_label modified for standard geologic age symbols and an integer code added for province arc-code unique integer identifier dike_lith general lithology dike_age geologic age source reference to source of data

    Entity_and_Attribute_Detail_Citation: ESRI

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
  2. Who also contributed to the data set?
    State Geologic Map Compilation (SGMC) activity of the National Surveys and Analysis projects of the US Geological Survey Mineral Resources Program.

  3. To whom should users address questions about the data?
    Suzanne W. Nicholson
    U.S. Geological Survey
    12201 Sunrise Valley Dr. MS954
    Reston, VA
    USA

    703-648-6344 (voice)
    swnich@usgs.gov

Why was the data set created?

A primary goal of this work is to develop geologic map datasets with standardized structure and attribution. The database design and standards are documented in CONUSdocumentationMW.pdf of this series. The intent is that contiguous databases can be merged seamlessly and without any additional effort. In addition to a common database structure, the conterminous U.S. state databases (the contiguous 48 states) have been fitted to a set of standard state boundaries so that, when states are merged, they match without slivers or overlap. No attempt has been made to reconcile differences in mapping across state boundaries.

How was the data set created?

  1. From what previous works were the data drawn?
    MN001 (source 1 of 3)
    Morey, G.B. (compiler), and Meints, Joyce (compiler), 2000, Geologic map of Minnesota, bedrock geology (3rd edition): Minnesota Geological Survey State Map Series S-20, Minnesota Geological Survey, St. Paul, Minnesota.

    Online Links:

    US001 (source 2 of 3)
    Johnson, Bruce R., unpublihsed material, 1:100,000 Scale State Boundaries of the Conterminous United States.

    Type_of_Source_Media: online
    Source_Scale_Denominator: 100,000
    Source_Contribution: Provided linework for state boundaries
    Johnson Lith Class 6.1 (source 3 of 3)
    Johnson, Bruce R., unpublished material, Geologic Map Unit Classification, ver. 6.1.

    Type_of_Source_Media: online; http://geology.usgs.gov/dm
    Source_Scale_Denominator: none
    Source_Contribution: Classification scheme used for lithology.
  2. How were the data generated, processed, and modified?
    Date: 2003 (process 1 of 6)
    The purpose of this standardization is to allow all SGMC covers to be seamlessly joined without any additional effort to form regional or national level digital maps. Note that for Alaska, the state is being compiled as blocks of 1:250k quadrangles that will ultimately be used to compile a new state map. Douglas Stoeser and Ric Wilson are co-coordinators for the overall SGMC effort, with Stoeser coordinating work on the mainland states and Wilson coordinating work for Alaska and Hawaii.
    Date: 11-Dec-2003 (process 2 of 6)
    C.L. Dicken obtained the digital geologic map of Minnesota from their website: http://www.geo.umn.edu/mgs/currentpubs.htm MGS anonymous ftp 1, folder s-20_3ed.

    Re-projected the coverage into the following:

    projection: Lambert Conformal Conic units: meters datum: NAD27 standard parallel 1: 33 0 0.000 standard parallel 2: 45 0 0.000 central meridian: -100 0 0.000 reference latitude: 0 0 0.000 false easting: 0.00000 false northing: 0.00000

    All attributes were deleted except map_label.

    (Note: Attributes associated with the generation of the coverages were not deleted. PAT - shape, area, perimeter, coverage#, and coverage-id AAT - shape, fnode#, tnode#, lnode#, rnode#, length, coverage#, and coverage-id)

    The values from map_label where then calculated into a new field called orig_label.
    Date: 18-Mar-2004 (process 3 of 6)
    The following attributes were exported from Filemaker as a .dbf

    map_symbol1 map_symbol2 unit_link reference_id unit_age rocktype1 rocktype2

    The attributes were then converted to the following structures:

    item name: orig_label width: 12 output: 12 type: c

    item name: sgmc_label width: 16 output: 16 type: c

    item name: unit_link width: 18 output: 18 type: c

    item name: source width: 6 output: 8 type: c

    item name: unit_age width: 60 output: 60 type: c

    item name: rocktype1 width: 40 output: 40 type: c

    item name: rocktype2 width: 40 output: 40 type: c
    Date: 24-Mar-2004 (process 4 of 6)
    Once the .dbf was in the correct format, it was converted into a lookup table in Arc/Info. Then a joinitem was done using orig_label as the merge item.
    Date: 21-Apr-2004 (process 5 of 6)
    Once the .pat file was correct, the .aat file was addressed. The following items were added to the table:

    item name: arc-code width: 3 output: 3 type: i

    item name: arc-para1 width: 3 output: 3 type: i

    item name: arc-para2 width: 3 output: 3 type: i

    item name: source width: 6 output: 8 type: c

    Date: 27-Apr-2004 (process 6 of 6)
    Arc-code was populated using the paper map source to tag the lines using the AAT line type data dictionary.

    Arc-para1 was populated when additional information was available such as upthrown side of a fault or angle of thrusting on a fault.

    Arc-para2 is a scratch field that is used mostly in Alaska.

    Source was populated with code that designates the source used for the linework; typically the paper map.
  3. What similar or related data should the user be aware of?

How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?
    The values of the attributes ROCKTYPE1 and ROCKTYPE2 were assigned based on the information in the legends of the source maps (most of which are paper). The definitions of these values are described in the draft document Geologic Map Classification version 6.1 (Johnson and others); available at the following website: http://geology.usgs.gov/dm
  2. How accurate are the geographic locations?
    The geologic map was digitized from compilations ranging in scale from 1:1,000,000 to 1:100,000 and is an accurate representation of the source maps. It is intended to be used at scales ranging from 1:1,000,000 to 1:500,000. Display at significantly larger scales may produce small errors in locations of contacts or faults relative to features contained in other data sets.

    Accuracy of Minnesota state boundary and those arcs intersecting it: The accuracy of the state boundary arcs is based on the 1:100000 scale original data used to produce this boundary. (Johnson, Bruce R. and Leveritch, Beth, 1998, 1:100,000 Scale State Boundaries of the Conterminous United States: U.S. Geological Survey, unpublished (see metadata file: st100kmeta.txt, CONUSdocumentationMW.pdf))

    Those internal arcs intersecting the state boundary were extended or shortened as needed to complete polygons, possibly creating a small amount of error.
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
    Bodies of water are classified as water, and the geologic units underlying them are not included in this coverage.
  5. How consistent are the relationships among the observations, including topology?
    All internal polygons were checked for closure with vendor software and on hard copy plots. Overshoots and undershoots have been deleted or corrected as appropriate.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?
Access_Constraints: none
Use_Constraints:
This database is not meant to be used or displayed at any scale other than 1:500,000.

Any hardcopies utilizing these data sets shall clearly indicate their source. If the licensee has modified the data in any way they are obligated to describe the types of modifications they have performed on the hardcopy map. Licensee specifically agrees not to misrepresent these data sets, nor to imply that changes they made were approved by the U.S. Geological Survey.

  1. Who distributes the data set? (Distributor 1 of 1)
    U.S. Geological Survey Information Services Reston-ESIC
    U.S. Geological Survey
    507 National Center
    Reston, Virginia
    USA

    1-888-ASK-USGS or 1-703-648-5953 (voice)
    http://www.usgs.gov/contact/
  2. What's the catalog number I need to order this data set? USGS OFR 2004-1355
  3. What legal disclaimers am I supposed to read?
    This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey (USGS) editorial standard nor with the North American stratigraphic codes. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the USGS. Although these data have been used by the USGS and have been successfully imported into data base programs, no warranty, expressed or implied, is made by the USGS as to how successfully or accurately the data can be imported into any specific application software running on any specific hardware platform. The fact of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in connection therewith. This data base GIS is not meant to be used or displayed at any scale other than 1:500,000.
  4. How can I download or order the data?

Who wrote the metadata?

Dates:
Last modified: 09-Mar-2004
Metadata author:
U.S. Geological Survey
Attn: Connie L. Dicken
12201 Sunrise Valley Dr. MS954
Reston, VA
USA

703-648-6482 (voice)
cdicken@usgs.gov
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)

This page is <https://mrdata.usgs.gov/geology/state/metadata/mn.faq.html>

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