Surficial geologic map of the Dillingham quadrangle, southwestern Alaska

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Frequently anticipated questions:

What does this data set describe?

Title:
Surficial geologic map of the Dillingham quadrangle, southwestern Alaska
Abstract:
This dataset represents geologic mapping of the Dillingham 1:250,000 scale quadrangle. It is used to create the map sheet in SIM 3388, which shows surficial geology at 1:250,000 scale.
  1. How might this data set be cited?
    Wilson, F.H., 2018, Surficial geologic map of the Dillingham quadrangle, southwestern Alaska: Scientific Investigations Map 3388.

    Online Links:

    Other_Citation_Details: 15 p., 1 sheet, scale 1:250,000.
  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -159.00
    East_Bounding_Coordinate: -156.00
    North_Bounding_Coordinate: 60.00
    South_Bounding_Coordinate: 59.00
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 2018
    Currentness_Reference:
    publication date
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: Vector Digital Data Set
  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?
      Grid_Coordinate_System_Name: Universal Transverse Mercator
      Universal_Transverse_Mercator:
      UTM_Zone_Number: 4
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: 0.9996
      Longitude_of_Central_Meridian: -159.0
      Latitude_of_Projection_Origin: 0.0
      False_Easting: 500000
      False_Northing: 0
      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 0.000256
      Ordinates (y-coordinates) are specified to the nearest 0.000256
      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 1/294.9787.
  7. How does the data set describe geographic features?
    arcs
    Characteristics of the line features in feature class disurf_arc are coded in the attribute table. The attribute table consists of the following items: ARC_CODE, ARC_PARA1, ARC_PARA2, SOURCE, LINEID (not used), and LINE_TYPE. (Source: This dataset)
    ARC_CODE
    ARC_CODE is a numeric short integer field in the attribute table. Values range nonsequentially from 1 to 99. ARC_CODE identifies a stratigraphic boundary, fault, or other linear feature. The ARC_CODE is described by the item LINE_TYPE as listed below. (Source: This dataset)
    ValueDefinition
    2Stratigraphic contact or intrusive contact, location approximate
    3Stratigraphic contact or intrusive contact, location inferred, queried
    4Normal fault, location certain
    5Normal fault, location approximate
    6Normal fault, location inferred, queried
    7Shoreline or riverbank
    9Boundary of altered zone or hornfels
    14Caldera or crater rim
    18Internal contact
    19Moraine limit, hachures point to ice
    51Concealed contact
    52Concealed normal fault
    99Bounding line (neatline) of coverage
    ARC_PARA1
    ARC_PARA1 is a numeric short integer field in the attribute table. ARC_PARA1 adds additional meaning to the ARC_CODE. (Source: This dataset)
    ValueDefinition
    0No attribute
    ARC_PARA2
    ARC_PARA2 is a numeric short integer field in the attribute table. ARC_PARA2 is a scratch field that is used to hide lines on the published map for cartographic purposes. (Source: This dataset)
    ValueDefinition
    0No attribute
    1For ARC_CODE = 2 or 3 indicates line between bedrock units that should not be displayed.
    SOURCE
    SOURCE is a text field in the attribute table. Values range nonsequentially from 1 to 99. SOURCE identifies the original source map a feature was digitized from. (Source: This dataset)
    ValueDefinition
    DI001Dillingham 1:250,000 scale topographic map
    DI005Wilson, F.H., Mohadjer, Solmaz, Labay, K.A., and Shew, Nora, 2006, Digital datasets for geologic map by Wilson, F.H., Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasauskas, E.P., Gamble, B.M., and Coonrad, W.L., Preliminary Integrated Geologic Map Databases for the United States: Digital Data for the Reconnaissance Bedrock Geologic Map for the Northern Alaska Peninsula area, Southwest Alaska: U.S. Geological Survey Open File Report 2006-1303, https://pubs.usgs.gov/of/2006/1303/
    DI013Wilson, F.H., 2008, Unpublished data.
    polygons
    Characteristics of the polygons in feature class disurf_poly are coded in the attribute table. The attribute table consists of the following items: CLASS, QCLASS, SOURCE, NSACLASS, NSAMOD, NSASUB (not used), SYMBOL, and UNITLABEL (geologic unit label). (Source: This dataset)
    CLASS
    CLASS is a numeric long integer field in the attribute table. Values range nonsequentially from 100 to 9872. Identifies units from original source maps. Attributes not used for this map. (Source: https://pubs.usgs.gov/of/2006/1303/)
    Range of values
    Minimum:100
    Maximum:9872
    QCLASS
    QCLASS is a numeric long integer field in the attribute table. Values range nonsequentially from 0 to 2750. Multiple QCLASS values can be assigned to the same unit. Similar to NSACLASS; allows finer subdivision of Quaternary geologic units. Each QCLASS value listed below is defined by the information from the UNITLABEL field which contains the geologic unit label. (Source: this data set)
    ValueDefinition
    0bu - Bedrock, undivided
    99bu - Bedrock, undivided
    102Water
    1000us - Surficial deposits, undivided (Quaternary)
    1030tf - Modern tidal flat deposits (Holocene)
    1050al - Flood-plain deposits (Holocene)
    1060af - Alluvial fan and talus deposits (Holocene)
    1061af - Alluvial fan and talus deposits (Holocene)
    1070cd - Colluvial deposits (Holocene)
    1080ls - Landslide deposits (Holocene)
    1100td - Terrace deposits (Quaternary)
    1102tdo - Older terrace deposits (Quaternary)
    1110ac - Abandoned channel deposits (Pleistocene)
    1111acl - Abandoned channel deposits, lake drainage (Quaternary)
    1120ld - Lacustrine deposits (Quaternary)
    1130fg - Fine-grained deposits (Quaternary)
    1140nl - Inferred levee deposit (Pleistocene)
    1150b - Beach deposits (Quaternary)
    1160es - Estuarine deposits (Holocene)
    1170mt - Marine terrace deposits (Holocene? and Pleistocene)
    1200ed - Eolian deposits (Quaternary)
    1203ed - Eolian deposits (Quaternary)
    1240gl - Glaciolacustrine deposits (late Pleistocene)
    1250g - Glacial deposits, undivided (Quaternary)
    1280sf - Solifluction deposits (Holocene)
    1290ek - Esker deposits (Pleistocene)
    1300gc - Glacial deposits in cirques (Holocene or late Wisconsin?)
    1360aky - Youngest advance, Aleknagik glaciation (late Pleistocene)
    1382ak - Drift, Aleknagik glaciation (late Pleistocene)
    1383ak - Drift, Aleknagik glaciation (late Pleistocene)
    1391bk - Drift, Brooks Lake glaciation, Kvichak advance (late Pleistocene)
    1392ok - Drift, Okstukuk glaciation (late Pleistocene)
    1395lw - Ground moraine (late Pleistocene)
    1402ako - Outwash, Aleknagik glaciation (late Pleistocene)
    1403lwo - Outwash (late Pleistocene)
    1901mh - Drift, Mak Hill glaciation (Pleistocene)
    1902ig - Drift, Iowithla glaciation (Pleistocene)
    1911mhd - Drumlins, Mak Hill glaciation (Pleistocene)
    1912igd - Drumlins, Iowithla glaciation (Pleistocene)
    1941mhg - Ground moraine, Mak Hill glaciation (Pleistocene)
    1942igg - Ground moraine, Iowithla glaciation (Pleistocene)
    1951mho - Outwash, Mak Hill glaciation (Pleistocene)
    1952io - Outwash, Iowithla glaciation (Pleistocene)
    2000ud - Drift, unnamed glaciations (early Pleistocene)
    2010ug - Ground moraine, unnamed glaciations (early Pleistocene)
    2100uo - Outwash, unnamed glaciations (early Pleistocene)
    2750sb - Scoured bedrock
    SOURCE
    SOURCE is a text field in the attribute table. Values range nonsequentially from 1 to 99. SOURCE identifies the original source map a feature was digitized from. (Source: This dataset)
    ValueDefinition
    DI001Dillingham 1:250,000 scale topographic map
    DI002Platt, J.N., and Muller, E.H., 1957, Unpublished data.
    DI003Hoare, J.M., and Coonrad, W.L, 1978, Geologic map of the Goodnews and Hagemeister Island quadrangles region, southwestern Alaska: U.S. Geological Survey Open-File Report 78-9-B, scale 1:250,000, 2 sheets. [Covers only extreme west edge of quadrangle]
    DI005Wilson, F.H., Mohadjer, Solmaz, Labay, K.A., and Shew, Nora, 2006, Digital datasets for geologic map by Wilson, F.H., Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasauskas, E.P., Gamble, B.M., and Coonrad, W.L., Preliminary Integrated Geologic Map Databases for the United States: Digital Data for the Reconnaissance Bedrock Geologic Map for the Northern Alaska Peninsula area, Southwest Alaska: U.S. Geological Survey Open File Report 2006-1303, https://pubs.usgs.gov/of/2006/1303/
    DI007Hoare, J.M., Coonrad, W.L., and Condon, W.H.,1953 to 1975, unpublished data.
    DI009Wilson, F.H., Hudson, T.L., Grybeck, Donald, Stoeser, D.B., Preller, C.C., Bickerstaff, Damon, Labay, Keith, and Miller, M.L., 2003, Preliminary geologic map of the northeast Dillingham quadrangle (D-1, D-2, C-1, and C-2), Alaska: U.S. Geological Survey Open-file Report 03-105, 13 p., scale 1:100,000.
    DI013Wilson, F.H., 2008, Unpublished data.
    NSACLASS
    NSACLASS is a numeric long integer field in the attribute table. Values range nonsequentially from 99 to 5820. Multiple NSACLASS values can be assigned to the same unit. Used to combine and correlate units from different maps throughout the state. See publication https://pubs.usgs.gov/of/2006/1303/ for descriptions of NSACLASS units. Attributes not used for this map. (Source: https://pubs.usgs.gov/of/2006/1303/)
    Range of values
    Minimum:99
    Maximum:5820
    NSAMOD
    NSAMOD is a text field in the polygon attribute table. NSAMOD describes additional characteristics of a NSACLASS unit if known. The same attribute can be assigned to multiple units. Values correspond to NSACLASS units only. Attributes not used for this map. (Source: https://pubs.usgs.gov/of/2006/1303/)
    ValueDefinition
    HFSUnit is hornfelsed
    QUnit is queried
    SYMBOL
    Symbol number used to identify color in style file wpgcmykg.style. (Source: this data set)
    Range of values
    Minimum:40
    Maximum:966
    UNITLABEL
    UNITLABEL is a text field in the polygon attribute table which holds the label of the geologic unit. (Source: This dataset)
    ValueDefinition
    buBedrock, undivided
    usSurficial deposits, undivided (Quaternary)
    tfModern tidal flat deposits (Holocene)
    alFlood-plain deposits (Holocene)
    afAlluvial fan and talus deposits (Holocene)
    cdColluvial deposits (Holocene)
    lsLandslide deposits (Holocene)
    tdTerrace deposits (Quaternary)
    tdoOlder terrace deposits (Quaternary)
    acAbandoned channel deposits (Pleistocene)
    aclAbandoned channel deposits, lake drainage (Quaternary)
    ldLacustrine deposits (Quaternary)
    fgFine-grained deposits (Quaternary)
    nlInferred levee deposit (Pleistocene)
    bBeach deposits (Quaternary)
    esEstuarine deposits (Holocene)
    mtMarine terrace deposits (Holocene? and Pleistocene)
    edEolian deposits (Quaternary)
    glGlaciolacustrine deposits (late Pleistocene)
    gGlacial deposits, undivided (Quaternary)
    sfSolifluction deposits (Holocene)
    ekEsker deposits (Pleistocene)
    gcGlacial deposits in cirques (Holocene or late Wisconsin?)
    akyYoungest advance, Aleknagik glaciation (late Pleistocene)
    akDrift, Aleknagik glaciation (late Pleistocene)
    bkDrift, Brooks Lake glaciation, Kvichak advance (late Pleistocene)
    okDrift, Okstukuk glaciation (late Pleistocene)
    lwGround moraine (late Pleistocene)
    akoOutwash, Aleknagik glaciation (late Pleistocene)
    lwoOutwash (late Pleistocene)
    mhDrift, Mak Hill glaciation (Pleistocene)
    igDrift, Iowithla glaciation (Pleistocene)
    mhdDrumlins, Mak Hill glaciation (Pleistocene)
    igdDrumlins, Iowithla glaciation (Pleistocene)
    mhgGround moraine, Mak Hill glaciation (Pleistocene)
    iggGround moraine, Iowithla glaciation (Pleistocene)
    mhoOutwash, Mak Hill glaciation (Pleistocene)
    ioOutwash, Iowithla glaciation (Pleistocene)
    udDrift, unnamed glaciations (early Pleistocene)
    ugGround moraine, unnamed glaciations (early Pleistocene)
    uoOutwash, unnamed glaciations (early Pleistocene)
    sbScoured bedrock
    SOURCECLASS
    Concatenated field that uniquely identifies a given source map (SOURCE) and geologic unit (CLASS). Field SOURCECLASS is a key field that links to field SOURCE_CLASS in table nsaunits. (Source: this data set)
    Formal codeset
    Codeset Name:nsaunits (provided as geodatabase table, Filemaker database, Filemaker runtime, and CSV and DBF files)
    Codeset Source:this data set

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?
    This digital coverage was created by Frederic Wilson and Keith Labay.
  3. To whom should users address questions about the data?
    U.S. Geological Survey, Alaska Region
    Attn: Frederic H. Wilson
    Research Geologist
    4210 University Drive
    Anchorage, AK
    USA

    907-786-7448 (voice)
    fwilson@usgs.gov

Why was the data set created?

Digital representation of geologic mapping facilitates the presentation and analysis of earth science data. Digital maps may be displayed at any scale or projection, however the geologic data in this coverage is not intended for use at a scale larger than 1:250,000.

How was the data set created?

  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
    Date: 2016 (process 1 of 1)
    The geology for the quadrangle was compiled from many different sources over a period of years from 1999-2016. Linework was hand digitized from materials of various media and scale. The arcs and polygons were attributed and topology was checked. Person who carried out this activity:
    U.S. Geological Survey
    Attn: Frederic H. Wilson
    4210 University Drive
    Anchorage, AK
    USA

    907-786-7448 (voice)
    fwilson@usgs.gov
  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?
    Many types of source materials of varying scales were used to compile this data set. Sources include previously published maps, unpublished mapping, and air photograph interpretation. Vector features were mostly digitized either by digitizing on screen or on a large-format digitizing tablet. Vectors and polygons were attributed and checked. Topology rules were checked.
  2. How accurate are the geographic locations?
    Users of this digital geologic map should respect the intentions of the original mappers and the limitations of the map. This geologic map compilation is intended to be used at a scale of 1:250,000; it is not intended to be used at a more detailed scale.
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
    These datasets were used to create the map portion of SIM 3388. Text files, tables, graphics, and topography shown on the map sheet are not included.
  5. How consistent are the relationships among the observations, including topology?
    File geodatabase di_surf.gdb contains one feature dataset and two feature classes: disurf (feature dataset) - digeol_arc (contacts, faults, and other line types); digeol_poly (geologic units)

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:
Acknowledgement of the U.S. Geological Survey would be appreciated in products derived from this data.
  1. Who distributes the data set? (Distributor 1 of 1)
    U.S. Geological Survey
    MS902 Box 25286 Denver Federal Center
    Lakewood, CO
    U.S.A.

    1-888-ASK-USGS (voice)
  2. What's the catalog number I need to order this data set? Scientific Investigations Map 3388
  3. What legal disclaimers am I supposed to read?
    This publication was prepared by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, expressed or implied, or assumes any legal liability or responsibility for the accuracy, product, or process disclosed in this report, or represents that its use would not infringe privately owned rights. Reference therein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof.
  4. How can I download or order the data?

Who wrote the metadata?

Dates:
Last modified: 11-May-2018
Last Reviewed: 09-Mar-2018
Metadata author:
U.S. Geological Survey
Attn: Keith Labay
4210 University Drive
Anchorage, AK
USA

907-786-7410 (voice)
klabay@usgs.gov
Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)
Generated by mp version 2.9.47 on Fri May 11 14:37:09 2018