Geologic map of the Umiat-Gubik area, central North Slope, Alaska

Metadata also available as - [Parseable text] - [XML]

Frequently anticipated questions:


What does this data set describe?

Title:
Geologic map of the Umiat-Gubik area, central North Slope, Alaska
Abstract:
This 1:63,360-scale geologic map of the hydrocarbon-bearing Umiat-Gubik area of the central North Slope, Alaska, spans approximately 2,100 km2 at the northern extent of the Brooks Range foothills fold-and-thrust belt in the Colville foreland basin. This geologic map was prepared through assimilation of field observations, aerial and satellite imagery, seismic-reflection data, and well logs. Near-surface formation picks were available or derived for most of the area's 24 exploration wells, and two cross-sections were constructed along lines of section that are constrained at depth by our interpretations of publicly available two-dimensional seismic data. The mapped area hosts exposures of Upper Cretaceous strata in the Nanushuk, Seabee, Tuluvak, Schrader Bluff, and Prince Creek Formations, constituting an approximately 2-km-thick succession that crops out discontinuously in the low-relief, tundra-mantled region. This part of the siliciclastic Brookian megasequence stratigraphy comprises principally shallow-marine deposits. Our work benefits from and reflects recent sequence-stratigraphic advances that better constrain how this part of the Colville basin continued to fill by a northeastward prograding clastic wedge during Late Cretaceous time, with the exposed stratigraphy recognized as basin-scale topset units. A series of east- to east-southeast-trending, km-scale wavelength, gentle folds are mapped in the area. Anticlines are locally breached by thrusts and interpreted to be folded above faulted and penetratively deformed mid-Cretaceous Torok Formation. Undeveloped, sub-commercial (as of this writing) petroleum accumulations occur along doubly plunging anticlinal traps at three long-recognized fields in the map area: Umiat (mostly oil), Gubik (gas), and East Umiat (gas). The Umiat oil field structural culmination is modified by thrust faults that breach the surface, and the East Umiat gas field is associated with a north-dipping back-thrust that is evident in seismic data and cuts across the Upper Cretaceous stratigraphy; thrust faults near the Gubik gas field lie within and below the Torok Formation. Various interpretations have previously been published for some of the area's structures, with important implications for petroleum trap geometries in the gas-prone foothills region. We present new data and interpretations that support the inference of a principal, south-dipping thrust fault that breaches the north limb of Umiat anticline near Umiat. The complete report and digital data are available from the DGGS website: <http://doi.org/10.14509/30099>.
Supplemental_Information:
This digital data distribution package provides shapefiles and geodatabase that portray features presented in RI 2018-6. Field names and values are organized according to the NCGMP09 - Draft Standard Format for Digital Publication of Geologic Maps, Version 1.1 by the USGS National Cooperative Geologic Mapping Program (NCGMP). This metadata file lists the table names and field names used in the geodatabase. Table and field names in the shapefiles are truncated at 10 characters. The geodatabase and selected shapefiles provide the following features:
Basemap: Geodatabase feature dataset that provides topographic contours, hydrology, and geographic place names. 
CorrelationOfMapUnits: Geodatabase feature dataset that depicts the map unit correlation chart; includes applicable unit designators, brackets, dividing lines, and text. 
CartographicLines: Cross section transects. 
ContactsAndFaults: Line features that depict faults and geologic contacts. 
DataSourcePolys: Polygons that delineate the data sources for various parts of the map. 
DataSources: Non-spatial reference table that provides bibliographic references for the datasets or information used to generate or interpret geologic or geographic features. 
DescriptionOfMapUnits: Non-spatial reference table that provides key information about each map unit. This table provides full unit descriptions. Additional information may be found in an accompanying report. 
GenericPoints: A point file that provides locations and labels for key geologic features or observations. 
GenericSamples: A point file that provides locations and labels for geologic samples. 
GeologicLines: Dikes, coal seams, ash beds, glacial features, anticline and syncline hinge-surface traces, and other kinds of key beds that do not participate in map-unit topology. 
GeoMaterialDict: Non-spatial reference table that provides definitions and a hierarchy for GeoMaterial names prescribed by the GeMS database schema. 
Glossary: Non-spatial reference table that, for certain database fields, lists the terms that populate these fields along with their definitions and sources for these definitions. 
MapUnitPolys: Polygons that record the distribution of mapped or interpreted geologic units. 
OrientationPoints: A point files that provide field station locations, symbology, and associated structure data (bedding attitudes, foliation attitudes, slip vectors measured at a point, etc.), NCGMP09 format. 
Stations: Field observation locations and descriptions.
  1. How should this data set be cited?

    Herriott, T.M., Wartes, M.A., Decker, P.L., Gillis, R.J., Shellenbaum, D.P., Willingham, A.L., and Mauel, D.J., 2018, Geologic map of the Umiat-Gubik area, central North Slope, Alaska: Report of Investigation RI 2018-6, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 55 p., 1 sheet, scale 1:63,360

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -153.000011
    East_Bounding_Coordinate: -151.061011
    North_Bounding_Coordinate: 69.510588
    South_Bounding_Coordinate: 69.239376

  3. What does it look like?

  4. Does the data set describe conditions during a particular time period?

    Beginning_Date: 2010
    Ending_Date: 2018
    Currentness_Reference: ground condition

  5. What is the general form of this data set?

    Geospatial_Data_Presentation_Form: report and digital data

  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: 5
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: 0.999600
      Longitude_of_Central_Meridian: -153
      Latitude_of_Projection_Origin: 0
      False_Easting: 500000.000000
      False_Northing: 0

      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest .00000001
      Ordinates (y-coordinates) are specified to the nearest .00000001
      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 6378206.40000000037.
      The flattening of the ellipsoid used is 1/294.978698199999997.

  7. How does the data set describe geographic features?

    Basemap
    Geodatabase feature dataset that provides topographic contours, hydrology, and geographic place names. (Source: Alaska Division of Geological & Geophysical Surveys (DGGS). This table is organized according to the NCGMP09 - Draft Standard Format for Digital Publication of Geologic Maps, Version 1.1 by the USGS National Cooperative Geologic Mapping Program (NCGMP).)

    CorrelationOfMapUnits
    Geodatabase feature dataset that depicts the map unit correlation chart; includes applicable unit designators, brackets, dividing lines, and text. (Source: Alaska Division of Geological & Geophysical Surveys (DGGS). This table is organized according to the NCGMP09 - Draft Standard Format for Digital Publication of Geologic Maps, Version 1.1 by the USGS National Cooperative Geologic Mapping Program (NCGMP).)

    CartographicLines, CartographicLinesAnno
    Cross section transects. (Source: Alaska Division of Geological & Geophysical Surveys (DGGS). This table is organized according to the NCGMP09 - Draft Standard Format for Digital Publication of Geologic Maps, Version 1.1 by the USGS National Cooperative Geologic Mapping Program (NCGMP).)

    Type
    Type values specify the kind of features represented by a line, point, or polygon (Source: Alaska Division of Geological & Geophysical Surveys)

    Feature type(s): cross section trace; endcap

    Symbol
    References the symbol value that was assigned to the point. (Source: Alaska Division of Geological & Geophysical Surveys)

    Formal codeset
    Codeset Name:FGDC Digital Cartographic Standard for Geologic Map Symbolization; Appendix A. Geologic map symbols, colors, and patterns, "REF NO" field
    Codeset Source:Federal Geographic Data Committee [prepared for the Federal Geographic Data Committee by the U.S. Geological Survey], 2006, FGDC Digital Cartographic Standard for Geologic Map Symbolization: Reston, Va., Federal Geographic Data Committee Document Number FGDC-STD-013-2006, 290 p., 2 plates.

    Label
    The label values provide text strings to display along with their associated feature. Depending on the context of the feature class, label values will contain applicable FGDCGeoAge font characters, feature labels, dip and plunge values for measured orientations, or other special characters. (Source: Alaska Division of Geological & Geophysical Surveys)

    Formal codeset
    Codeset Name:FGDCGeoAge font
    Codeset Source:Federal Geographic Data Committee [prepared for the Federal Geographic Data Committee by the U.S. Geological Survey], 2006, FGDC Digital Cartographic Standard for Geologic Map Symbolization: Reston, Va., Federal Geographic Data Committee Document Number FGDC-STD-013-2006, 290 p., 2 plates.

    DataSourceID
    Provides information about the source of the feature. (Source: Alaska Division of Geological & Geophysical Surveys)

    Foreign key to the DataSources_ID field in the DataSources table.

    ContactsAndFaults
    Line features that depict faults and geologic contacts. (Source: Alaska Division of Geological & Geophysical Surveys (DGGS). This table is organized according to the NCGMP09 - Draft Standard Format for Digital Publication of Geologic Maps, Version 1.1 by the USGS National Cooperative Geologic Mapping Program (NCGMP).)

    Type
    Type values specify the kind of features represented by a line, point, or polygon (Source: Alaska Division of Geological & Geophysical Surveys)

    Feature type(s): contact; fault; map boundary

    IsConcealed
    This is a flag to identify contacts and faults covered by overlying map units. (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    NThe feature IS NOT covered by an overlying map unit.
    YThe feature IS covered by an overlying map unit.

    LocationConfidenceMeters
    Half-width in meters of positional uncertainty envelope; position is relative to other features in the data. A value of -9 indicates that this measure is not available. (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:3
    Maximum:50
    Units:meters

    ExistenceConfidence
    Indicates the degree of confidence and/or certainty in the interpretation of a feature's existence. (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    certainIndicates that the author has sufficient observational and/or other supporting data to be reasonably confident in the scientific credibility of the interpretation of the feature. The level of certainty is specific to the map scale.
    questionableThe interpretation of the feature at the mapped scale fits the overall proposed geologic model but the extent and/or classification is questionable or uncertain due to insufficient observations and/or supporting data.

    IdentityConfidence
    Indicates degree of confidence in the identification and classification of the feature. (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    certainIndicates that the author has sufficient observational and/or other supporting data to be reasonably confident in the scientific credibility of the interpretation of the feature. The level of certainty is specific to the map scale.
    questionableThe interpretation of the feature at the mapped scale fits the overall proposed geologic model but the extent and/or classification is questionable or uncertain due to insufficient observations and/or supporting data.

    Symbol
    References the symbol value that was assigned to the point. (Source: Alaska Division of Geological & Geophysical Surveys)

    Formal codeset
    Codeset Name:FGDC Digital Cartographic Standard for Geologic Map Symbolization; Appendix A. Geologic map symbols, colors, and patterns, "REF NO" field
    Codeset Source:Federal Geographic Data Committee [prepared for the Federal Geographic Data Committee by the U.S. Geological Survey], 2006, FGDC Digital Cartographic Standard for Geologic Map Symbolization: Reston, Va., Federal Geographic Data Committee Document Number FGDC-STD-013-2006, 290 p., 2 plates.

    DataSourceID
    Provides information about the source of the feature. (Source: Alaska Division of Geological & Geophysical Surveys)

    Foreign key to the DataSources_ID field in the DataSources table.

    DataSourcePolys
    Polygons that delineate the data sources for various parts of the map. (Source: Alaska Division of Geological & Geophysical Surveys (DGGS). This table is organized according to the NCGMP09 - Draft Standard Format for Digital Publication of Geologic Maps, Version 1.1 by the USGS National Cooperative Geologic Mapping Program (NCGMP).)

    DataSourceID
    Provides information about the source of the feature. (Source: Alaska Division of Geological & Geophysical Surveys)

    Foreign key to the DataSources_ID field in the DataSources table.

    Notes
    Free text for additional information about a feature. (Source: Alaska Division of Geological & Geophysical Surveys)

    The notes indicate the source of the feature interpretation or provide more information about the processing or data acquisition procedure.

    DataSources
    Non-spatial reference table that provides bibliographic references for the datasets or information used to generate or interpret geologic or geographic features. (Source: Alaska Division of Geological & Geophysical Surveys (DGGS). This table is organized according to the NCGMP09 - Draft Standard Format for Digital Publication of Geologic Maps, Version 1.1 by the USGS National Cooperative Geologic Mapping Program (NCGMP).)

    Source
    Plain-text short description that identifies the data source. (Source: Alaska Division of Geological & Geophysical Surveys)

    By convention, for DataSources_ID = DAS1, Source = 'This report'. Other values are standard bibliographic references. Null values not permitted.

    Notes
    Free text for additional information about a feature. (Source: Alaska Division of Geological & Geophysical Surveys)

    The notes indicate the source of the feature interpretation or provide more information about the processing or data acquisition procedure.

    DataSources_ID
    Provides information about the source of the feature. (Source: Alaska Division of Geological & Geophysical Surveys)

    Primary key in the DataSources table; Example values = DAS1, DAS2, DAS3,... Null values not permitted

    DescriptionOfMapUnits
    Non-spatial reference table that provides key information about each map unit. This table provides full unit descriptions. Additional information may be found in an accompanying report. (Source: Alaska Division of Geological & Geophysical Surveys (DGGS). This table is organized according to the NCGMP09 - Draft Standard Format for Digital Publication of Geologic Maps, Version 1.1 by the USGS National Cooperative Geologic Mapping Program (NCGMP).)

    MapUnit
    Short ASCII string that indicates the map unit. Note: map units in parentheses, such as (Qcf), indicate combined map units consisting of bedrock overlain by thin or discontinuous deposits of the map unit. Map units with a question mark, such as (Qus?), indicate an uncertain identification. (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    KnNanushuk Formation
    KpcPrince Creek Formation
    KsSeabee Formation
    KsblbBarrow Trail Member
    KsblrRogers Creek Member
    KsblsSentinel Hill Member
    KtuTuluvak Formation
    QalAlluvial Deposits

    Name
    Full map unit name, identifies the unit within its hierarchical context. (Source: Alaska Division of Geological & Geophysical Surveys)

    When applicable, usage is consistent with U.S. Geologic Names Lexicon

    Age
    Stratigraphic ranges or age of the map unit. (Source: Alaska Division of Geological & Geophysical Surveys)

    Formal codeset
    Codeset Name:Geologic Time Scale v. 4.0
    Codeset Source:Walker, J.D., Geissman, J.W., Bowring, S.A, and Babcock, L.E., comp., 2012, Geologic Time Scale v. 4.0: Geological Society of America

    Description
    Free-format text description of the map unit. (Source: Alaska Division of Geological & Geophysical Surveys)

    Commonly structured according to one or more accepted traditions (for example, lithology, thickness, color, weathering and outcrop characteristics, distinguishing features, genesis, age constraints).

    GenericPoints, GenericPointsAnno
    A point file that provides locations and labels for key geologic features or observations. (Source: Alaska Division of Geological & Geophysical Surveys (DGGS). This table is organized according to the NCGMP09 - Draft Standard Format for Digital Publication of Geologic Maps, Version 1.1 by the USGS National Cooperative Geologic Mapping Program (NCGMP).)

    Type
    Type values specify the kind of features represented by a line, point, or polygon (Source: Alaska Division of Geological & Geophysical Surveys)

    Feature type(s): summit; town; well

    Symbol
    References the symbol value that was assigned to the point. (Source: Alaska Division of Geological & Geophysical Surveys)

    Formal codeset
    Codeset Name:FGDC Digital Cartographic Standard for Geologic Map Symbolization; Appendix A. Geologic map symbols, colors, and patterns, "REF NO" field
    Codeset Source:Federal Geographic Data Committee [prepared for the Federal Geographic Data Committee by the U.S. Geological Survey], 2006, FGDC Digital Cartographic Standard for Geologic Map Symbolization: Reston, Va., Federal Geographic Data Committee Document Number FGDC-STD-013-2006, 290 p., 2 plates.

    Label
    The label values provide text strings to display along with their associated feature. Depending on the context of the feature class, label values will contain applicable FGDCGeoAge font characters, feature labels, dip and plunge values for measured orientations, or other special characters. (Source: Alaska Division of Geological & Geophysical Surveys)

    Formal codeset
    Codeset Name:FGDCGeoAge font
    Codeset Source:Federal Geographic Data Committee [prepared for the Federal Geographic Data Committee by the U.S. Geological Survey], 2006, FGDC Digital Cartographic Standard for Geologic Map Symbolization: Reston, Va., Federal Geographic Data Committee Document Number FGDC-STD-013-2006, 290 p., 2 plates.

    LocationConfidenceMeters
    Half-width in meters of positional uncertainty envelope; position is relative to other features in the data. A value of -9 indicates that this measure is not available. (Source: Alaska Division of Geological & Geophysical Surveys)

    Data type = integer

    MapUnit
    Short ASCII string that indicates the map unit. Note: map units in parentheses, such as (Qcf), indicate combined map units consisting of bedrock overlain by thin or discontinuous deposits of the map unit. Map units with a question mark, such as (Qus?), indicate an uncertain identification. (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    KnNanushuk Formation
    KsSeabee Formation
    KsblrRogers Creek Member
    KsblsSentinel Hill Member
    KtuTuluvak Formation
    QalAlluvial Deposits

    LocationSourceID
    Provides information about the source of the feature. (Source: Alaska Division of Geological & Geophysical Surveys)

    Foreign key to the DataSources_ID field in the DataSources table.

    DataSourceID
    Provides information about the source of the feature. (Source: Alaska Division of Geological & Geophysical Surveys)

    Foreign key to the DataSources_ID field in the DataSources table.

    Notes
    Free text for additional information about a feature. (Source: Alaska Division of Geological & Geophysical Surveys)

    The notes indicate the source of the feature interpretation or provide more information about the processing or data acquisition procedure.

    GenericSamples
    A point file that provides locations and labels for geologic samples. (Source: Alaska Division of Geological & Geophysical Surveys (DGGS). This table is organized according to the NCGMP09 - Draft Standard Format for Digital Publication of Geologic Maps, Version 1.1 by the USGS National Cooperative Geologic Mapping Program (NCGMP).)

    Type
    Type values specify the kind of features represented by a line, point, or polygon (Source: Alaska Division of Geological & Geophysical Surveys)

    Feature type(s): megafossil; geochronology; thin section; palynology; thin section, porosity and permeability; vitrinite reflectance; detrital zircon; 40Ar/39Ar; foraminifera, palynology; extract/biomarkers; U/Pb; porosity and permeability; Rock-Eval pyrolysis and total organic carbon; lithology; Rock-Eval pyrolysis and total organic carbon, vitrinite reflectance; unknown; Rock-Eval pyrolysis and total organic carbon, extract; thin section, lithology

    Symbol
    References the symbol value that was assigned to the point. (Source: Alaska Division of Geological & Geophysical Surveys)

    Formal codeset
    Codeset Name:FGDC Digital Cartographic Standard for Geologic Map Symbolization; Appendix A. Geologic map symbols, colors, and patterns, "REF NO" field
    Codeset Source:Federal Geographic Data Committee [prepared for the Federal Geographic Data Committee by the U.S. Geological Survey], 2006, FGDC Digital Cartographic Standard for Geologic Map Symbolization: Reston, Va., Federal Geographic Data Committee Document Number FGDC-STD-013-2006, 290 p., 2 plates.

    Label
    The label values provide text strings to display along with their associated feature. Depending on the context of the feature class, label values will contain applicable FGDCGeoAge font characters, feature labels, dip and plunge values for measured orientations, or other special characters. (Source: Alaska Division of Geological & Geophysical Surveys)

    Formal codeset
    Codeset Name:FGDCGeoAge font
    Codeset Source:Federal Geographic Data Committee [prepared for the Federal Geographic Data Committee by the U.S. Geological Survey], 2006, FGDC Digital Cartographic Standard for Geologic Map Symbolization: Reston, Va., Federal Geographic Data Committee Document Number FGDC-STD-013-2006, 290 p., 2 plates.

    FieldSampleID
    Identifier assigned by the person who originally located the sample (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    NULLA sample number was not recorded or was not assigned.

    Generic example of a DGGS sample identifier: YYYYAAA9999XXXX; YY or YYYY= year, AAA=geologist's initials (one to three characters), 9999=unique station number, XXXX= optional alpha characters which indicate that multiple samples were collected at a given location or that multiple observations with possibly identical prefixes were recorded in the project database. Field stations observed by non-DGGS personnel use identifiers from the originating reference.

    LocationConfidenceMeters
    Half-width in meters of positional uncertainty envelope; position is relative to other features in the data. A value of -9 indicates that this measure is not available. (Source: Alaska Division of Geological & Geophysical Surveys)

    Data type = integer

    StationID
    Identifier assigned by the person who originally located station (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    NULLA station number was not recorded or was not assigned.

    This field mapping program used a station numbering convention that differs from the DGGS standard station numbering format.

    MapUnit
    Short ASCII string that indicates the map unit. Note: map units in parentheses, such as (Qcf), indicate combined map units consisting of bedrock overlain by thin or discontinuous deposits of the map unit. Map units with a question mark, such as (Qus?), indicate an uncertain identification. (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    NULLBlank (NULL) field values indicate that a map unit value was not assigned.
    KnNanushuk Formation
    KpcPrince Creek Formation
    KsSeabee Formation
    KsblbBarrow Trail Member
    KsblrRogers Creek Member
    KsblsSentinel Hill Member
    KtuTuluvak Formation
    QalAlluvial Deposits

    LocationSourceID
    Provides information about the source of the feature. (Source: Alaska Division of Geological & Geophysical Surveys)

    Foreign key to the DataSources_ID field in the DataSources table.

    DataSourceID
    Provides information about the source of the feature. (Source: Alaska Division of Geological & Geophysical Surveys)

    Foreign key to the DataSources_ID field in the DataSources table.

    Notes
    Free text for additional information about a feature. (Source: Alaska Division of Geological & Geophysical Surveys)

    The notes indicate the source of the feature interpretation or provide more information about the processing or data acquisition procedure.

    GeologicLines, GeologicLinesAnno
    Dikes, coal seams, ash beds, glacial features, anticline and syncline hinge-surface traces, and other kinds of key beds that do not participate in map-unit topology. (Source: Alaska Division of Geological & Geophysical Surveys (DGGS). This table is organized according to the NCGMP09 - Draft Standard Format for Digital Publication of Geologic Maps, Version 1.1 by the USGS National Cooperative Geologic Mapping Program (NCGMP).)

    Type
    Type values specify the kind of features represented by a line, point, or polygon (Source: Alaska Division of Geological & Geophysical Surveys)

    Feature type(s): anticline hinge trace; syncline hinge trace; plunge direction; traceable bed

    IsConcealed
    This is a flag to identify contacts and faults covered by overlying map units. (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    YThe feature IS covered by an overlying map unit.
    NThe feature IS NOT covered by an overlying map unit.

    LocationConfidenceMeters
    Half-width in meters of positional uncertainty envelope; position is relative to other features in the data. A value of -9 indicates that this measure is not available. (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:3
    Maximum:30
    Units:meters

    ExistenceConfidence
    Indicates the degree of confidence and/or certainty in the interpretation of a feature's existence. (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    certainIndicates that the author has sufficient observational and/or other supporting data to be reasonably confident in the scientific credibility of the interpretation of the feature. The level of certainty is specific to the map scale.

    IdentityConfidence
    Indicates degree of confidence in the identification and classification of the feature. (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    certainIndicates that the author has sufficient observational and/or other supporting data to be reasonably confident in the scientific credibility of the interpretation of the feature. The level of certainty is specific to the map scale.

    Symbol
    References the symbol value that was assigned to the point. (Source: Alaska Division of Geological & Geophysical Surveys)

    Formal codeset
    Codeset Name:FGDC Digital Cartographic Standard for Geologic Map Symbolization; Appendix A. Geologic map symbols, colors, and patterns, "REF NO" field
    Codeset Source:Federal Geographic Data Committee [prepared for the Federal Geographic Data Committee by the U.S. Geological Survey], 2006, FGDC Digital Cartographic Standard for Geologic Map Symbolization: Reston, Va., Federal Geographic Data Committee Document Number FGDC-STD-013-2006, 290 p., 2 plates.

    Label
    The label values provide text strings to display along with their associated feature. Depending on the context of the feature class, label values will contain applicable FGDCGeoAge font characters, feature labels, dip and plunge values for measured orientations, or other special characters. (Source: Alaska Division of Geological & Geophysical Surveys)

    Formal codeset
    Codeset Name:FGDCGeoAge font
    Codeset Source:Federal Geographic Data Committee [prepared for the Federal Geographic Data Committee by the U.S. Geological Survey], 2006, FGDC Digital Cartographic Standard for Geologic Map Symbolization: Reston, Va., Federal Geographic Data Committee Document Number FGDC-STD-013-2006, 290 p., 2 plates.

    DataSourceID
    Provides information about the source of the feature. (Source: Alaska Division of Geological & Geophysical Surveys)

    Foreign key to the DataSources_ID field in the DataSources table.

    GeoMaterialDict
    Non-spatial reference table that provides definitions and a hierarchy for GeoMaterial names prescribed by the GeMS database schema. (Source: GeMS (Geologic Map Schema) - a standard format for digital publication of geologic maps by the USGS National Cooperative Geologic Mapping Program (NCGMP). This table is organized according to the NCGMP09 - Draft Standard Format for Digital Publication of Geologic Maps, Version 1.1 by the USGS National Cooperative Geologic Mapping Program (NCGMP).)

    Glossary
    Non-spatial reference table that, for certain database fields, lists the terms that populate these fields along with their definitions and sources for these definitions. (Source: GeMS (Geologic Map Schema) - a standard format for digital publication of geologic maps by the USGS National Cooperative Geologic Mapping Program (NCGMP). This table is organized according to the NCGMP09 - Draft Standard Format for Digital Publication of Geologic Maps, Version 1.1 by the USGS National Cooperative Geologic Mapping Program (NCGMP).)

    MapUnitPolys, MapUnitPolysAnno, MapUnitOverlayPolys
    Polygons that record the distribution of mapped or interpreted geologic units. (Source: Alaska Division of Geological & Geophysical Surveys (DGGS) This table is organized according to the NCGMP09 - Draft Standard Format for Digital Publication of Geologic Maps, Version 1.1 by the USGS National Cooperative Geologic Mapping Program (NCGMP).)

    MapUnit
    Short ASCII string that indicates the map unit. Note: map units in parentheses, such as (Qcf), indicate combined map units consisting of bedrock overlain by thin or discontinuous deposits of the map unit. Map units with a question mark, such as (Qus?), indicate an uncertain identification. (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    KnNanushuk Formation
    KpcPrince Creek Formation
    KsSeabee Formation
    KsblbBarrow Trail Member
    KsblrRogers Creek Member
    KsblsSentinel Hill Member
    KtuTuluvak Formation
    QalAlluvial Deposits

    IdentityConfidence
    Indicates degree of confidence in the identification and classification of the feature. (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    certainIndicates that the author has sufficient observational and/or other supporting data to be reasonably confident in the scientific credibility of the interpretation of the feature. The level of certainty is specific to the map scale.
    questionableThe interpretation of the feature at the mapped scale fits the overall proposed geologic model but the extent and/or classification is questionable or uncertain due to insufficient observations and/or supporting data.

    Label
    The label values provide text strings to display along with their associated feature. Depending on the context of the feature class, label values will contain applicable FGDCGeoAge font characters, feature labels, dip and plunge values for measured orientations, or other special characters. (Source: Alaska Division of Geological & Geophysical Surveys)

    Formal codeset
    Codeset Name:FGDCGeoAge font
    Codeset Source:Federal Geographic Data Committee [prepared for the Federal Geographic Data Committee by the U.S. Geological Survey], 2006, FGDC Digital Cartographic Standard for Geologic Map Symbolization: Reston, Va., Federal Geographic Data Committee Document Number FGDC-STD-013-2006, 290 p., 2 plates.

    Symbol
    References the CMYK color value that was assigned to the map unit. (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    3150CMYK value - C:30%, M:13%, Y:50%, K:0%
    2040CMYK value - C:20%, M:0%, Y:40%, K:0%
    3A40CMYK value - C:30%, M:8%, Y:40%, K:0%
    2030CMYK value - C:20%, M:0%, Y:30%, K:0%
    4160CMYK value - C:40%, M:13%, Y:60%, K:0%
    1050CMYK value - C:13%, M:0%, Y:50%, K:0%
    A030CMYK value - C:8%, M:0%, Y:30%, K:0%
    0010CMYK value - C:0%, M:0%, Y:13%, K:0%

    DataSourceID
    Provides information about the source of the feature. (Source: Alaska Division of Geological & Geophysical Surveys)

    Foreign key to the DataSources_ID field in the DataSources table.

    OrientationPoints, OrientationPointsAnno
    A point files that provide field station locations, symbology, and associated structure data (bedding attitudes, foliation attitudes, slip vectors measured at a point, etc.), NCGMP09 format. (Source: Alaska Division of Geological & Geophysical Surveys (DGGS) This table is organized according to the NCGMP09 - Draft Standard Format for Digital Publication of Geologic Maps, Version 1.1 by the USGS National Cooperative Geologic Mapping Program (NCGMP).)

    Type
    Type values specify the kind of features represented by a line, point, or polygon (Source: Alaska Division of Geological & Geophysical Surveys)

    Feature type(s): bedding

    Azimuth
    Strike or trend, measured in degrees clockwise from geographic North, using right-hand rule (dip is to the right of azimuth direction). Note: Null values not permitted according to the NCGMP09 standard; zero values may indicate that the orientation of the feature was not measured. (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:46
    Maximum:352
    Units:degrees

    Inclination
    Dip or plunge, measured in degrees down from horizontal. Note: Null values not permitted according to the NCGMP09 standard; zero values may indicate that the orientation of the feature was not measured. (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:2
    Maximum:84
    Units:degrees

    Symbol
    References the symbol value that was assigned to the point. (Source: Alaska Division of Geological & Geophysical Surveys)

    Formal codeset
    Codeset Name:FGDC Digital Cartographic Standard for Geologic Map Symbolization; Appendix A. Geologic map symbols, colors, and patterns, "REF NO" field
    Codeset Source:Federal Geographic Data Committee [prepared for the Federal Geographic Data Committee by the U.S. Geological Survey], 2006, FGDC Digital Cartographic Standard for Geologic Map Symbolization: Reston, Va., Federal Geographic Data Committee Document Number FGDC-STD-013-2006, 290 p., 2 plates.

    Label
    The label values provide text strings to display along with their associated feature. Depending on the context of the feature class, label values will contain applicable FGDCGeoAge font characters, feature labels, dip and plunge values for measured orientations, or other special characters. (Source: Alaska Division of Geological & Geophysical Surveys)

    Formal codeset
    Codeset Name:FGDCGeoAge font
    Codeset Source:Federal Geographic Data Committee [prepared for the Federal Geographic Data Committee by the U.S. Geological Survey], 2006, FGDC Digital Cartographic Standard for Geologic Map Symbolization: Reston, Va., Federal Geographic Data Committee Document Number FGDC-STD-013-2006, 290 p., 2 plates.

    LocationConfidenceMeters
    Half-width in meters of positional uncertainty envelope; position is relative to other features in the data. A value of -9 indicates that this measure is not available. (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:3
    Maximum:3
    Units:meters

    IdentityConfidence
    Indicates degree of confidence in the identification and classification of the feature. (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    certainIndicates that the author has sufficient observational and/or other supporting data to be reasonably confident in the scientific credibility of the interpretation of the feature. The level of certainty is specific to the map scale.

    OrientationConfidenceDegrees
    Estimated circular error, in degrees. For planar features, error in the orientation of pole to plane. Note: Null values not permitted according to the NCGMP09 standard; zero values may indicate that the orientation of the feature was not measured. (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:2
    Maximum:15
    Units:degrees

    StationID
    Identifier assigned by the person who originally located station (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    NULLA station number was not recorded or was not assigned.

    This field mapping program used a station numbering convention that differs from the DGGS standard station numbering format.

    MapUnit
    Short ASCII string that indicates the map unit. Note: map units in parentheses, such as (Qcf), indicate combined map units consisting of bedrock overlain by thin or discontinuous deposits of the map unit. Map units with a question mark, such as (Qus?), indicate an uncertain identification. (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    KnNanushuk Formation
    KpcPrince Creek Formation
    KsSeabee Formation
    KsblbBarrow Trail Member
    KsblrRogers Creek Member
    KsblsSentinel Hill Member
    KtuTuluvak Formation

    LocationSourceID
    Provides information about the source of the feature. (Source: Alaska Division of Geological & Geophysical Surveys)

    Foreign key to the DataSources_ID field in the DataSources table.

    Notes
    Free text for additional information about a feature. (Source: Alaska Division of Geological & Geophysical Surveys)

    The notes indicate the source of the feature interpretation or provide more information about the processing or data acquisition procedure.

    Stations
    Field observation locations and descriptions. (Source: Alaska Division of Geological & Geophysical Surveys (DGGS). This table is organized according to the NCGMP09 - Draft Standard Format for Digital Publication of Geologic Maps, Version 1.1 by the USGS National Cooperative Geologic Mapping Program (NCGMP).)

    FieldID
    Identifier assigned by person who originally located station (Source: Alaska Division of Geological & Geophysical Surveys)

    Generic example of a sample identifier: YYYYAAA9999X; YY or YYYY= year, AAA=geologist's initials (one to three characters), 9999=unique station number, X= optional alpha character which indicates that multiple samples were collected at a given location or that multiple observations were recorded in the project database.

    LocationConfidenceMeters
    Half-width in meters of positional uncertainty envelope; position is relative to other features in the data. A value of -9 indicates that this measure is not available. (Source: Alaska Division of Geological & Geophysical Surveys)

    Data type = integer

    MapUnit
    Short ASCII string that indicates the map unit. Note: map units in parentheses, such as (Qcf), indicate combined map units consisting of bedrock overlain by thin or discontinuous deposits of the map unit. Map units with a question mark, such as (Qus?), indicate an uncertain identification. (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    NULLBlank (NULL) field values indicate that a map unit value was not assigned.
    KnNanushuk Formation
    KpcPrince Creek Formation
    KsSeabee Formation
    KsblbBarrow Trail Member
    KsblrRogers Creek Member
    KsblsSentinel Hill Member
    KtuTuluvak Formation
    QalAlluvial Deposits

    Symbol
    References the symbol value that was assigned to the point. (Source: Alaska Division of Geological & Geophysical Surveys)

    Formal codeset
    Codeset Name:FGDC Digital Cartographic Standard for Geologic Map Symbolization; Appendix A. Geologic map symbols, colors, and patterns, "REF NO" field
    Codeset Source:Federal Geographic Data Committee [prepared for the Federal Geographic Data Committee by the U.S. Geological Survey], 2006, FGDC Digital Cartographic Standard for Geologic Map Symbolization: Reston, Va., Federal Geographic Data Committee Document Number FGDC-STD-013-2006, 290 p., 2 plates.

    Label
    The label values provide text strings to display along with their associated feature. Depending on the context of the feature class, label values will contain applicable FGDCGeoAge font characters, feature labels, dip and plunge values for measured orientations, or other special characters. (Source: Alaska Division of Geological & Geophysical Surveys)

    Formal codeset
    Codeset Name:FGDCGeoAge font
    Codeset Source:Federal Geographic Data Committee [prepared for the Federal Geographic Data Committee by the U.S. Geological Survey], 2006, FGDC Digital Cartographic Standard for Geologic Map Symbolization: Reston, Va., Federal Geographic Data Committee Document Number FGDC-STD-013-2006, 290 p., 2 plates.

    DataSourceID
    Provides information about the source of the feature. (Source: Alaska Division of Geological & Geophysical Surveys)

    Foreign key to the DataSources_ID field in the DataSources table.

    Notes
    Free text for additional information about a feature. (Source: Alaska Division of Geological & Geophysical Surveys)

    The notes indicate the source of the feature interpretation or provide more information about the processing or data acquisition procedure.

    LocationMethod
    Term that categorizes technique used to determine station location (Source: Alaska Division of Geological & Geophysical Surveys)

    Location method(s): Recreational GPS

    TimeDate
    Time and date of observation at station. (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:6/20/2010
    Maximum:8/7/2011

    Observer
    Name of the person who located station (Source: Alaska Division of Geological & Geophysical Surveys)

    Observer(s): Trystan Herriott; Paul Decker; David Mauel; Robert Gillis; Marwan Wartes

    GPSX
    Station coordinate downloaded from GPS, datum. (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:-153.288226
    Maximum:-150.84161
    Units:degrees

    GPSY
    Station coordinate downloaded from GPS, datum. (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:68.60889
    Maximum:69.50793
    Units:degrees


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?

    The State of Alaska funded this study, with additional support from the U.S. Geological Survey's National Cooperative Geologic Mapping Program (STATEMAP award number G12AC20187). Work by, and discussions with, Gil Mull, Dave LePain, and Dave Houseknecht were invaluable to this study. Ken Helmold, Dolores van der Kolk, Grant Shimer, Pete Flaig, Julie Houle, Meg Kramer, and Don Krouskop also shared their knowledge of the Umiat-Gubik area. Richard Kemnitz provided many insights regarding field logistics. Our field camps at Umiat were operated by Horst Expediting and 70 North. Helicopter pilot Tom "Rat" Ratledge safely transported the crew during field campaigns. Trish Ekberg, Nina Harun, and Mike Hendricks served additional geographic information system (GIS) support. Simone Montayne managed metadata for this report. Kristen Janssen provided manuscript formatting and layout. We thank Dave LePain and Tom Homza for thorough reviews that improved the clarity and content of this paper.

  3. To whom should users address questions about the data?

    Alaska Division of Geological & Geophysical Surveys
    Metadata Manager
    3354 College Road
    Fairbanks, AK 99709-3707
    USA

    (907)451-5020 (voice)
    (907)451-5050 (FAX)
    dggspubs@alaska.gov

    Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays


Why was the data set created?

Umiat-Gubik and surrounding areas have long been recognized for their importance to understanding the geologic evolution of northern Alaska. Undeveloped, sub-commercial (as of this writing) petroleum accumulations occur along doubly plunging anticlinal traps at three long-recognized fields in the map area: Umiat (mostly oil), Gubik (gas), and East Umiat (gas).


How was the data set created?

  1. From what previous works were the data drawn?

    Brosge, W.P. and Whittington, C.L., 1966 (source 1 of 8)
    Brosge, W.P., and Whittington, C.L., 1966, Geology of the Umiat-Maybe Creek region, Alaska: Professional Paper P 303-H, U.S. Geological Survey, United States.

    Online Links:

    Other_Citation_Details: p. 501-638, 9 sheets
    Type_of_Source_Media: paper
    Source_Contribution: Outcrop mapping

    Carter, L.D. and Galloway, J.P., 1986 (source 2 of 8)
    Carter, L.D., and Galloway, J.P., 1986, Engineering - geologic maps of northern Alaska, Umiat Quadrangle: Open-File Report OF 86-335, U.S. Geological Survey, United States.

    Online Links:

    Other_Citation_Details: 16 p., 2 sheets, scale 1:250,000
    Type_of_Source_Media: paper
    Source_Scale_Denominator: 250000
    Source_Contribution: Outcrop mapping

    Detterman, R.L. and others, 1963 (source 3 of 8)
    Detterman, R.L., Bickel, R.S., and Gryc, George, 1963, Geology of the Chandler River region, Alaska: Professional Paper P 303-E, U.S. Geological Survey, United States.

    Online Links:

    Other_Citation_Details: p. 233-324, 16 sheets, scale 1:125,000
    Type_of_Source_Media: paper
    Source_Scale_Denominator: 125000
    Source_Contribution: Outcrop mapping

    LePain, D.L. and others, 2009 (source 4 of 8)
    LePain, D.L., McCarthy, P.J., and Kirkham, Russell, 2009, Sedimentology and sequence stratigraphy of the middle Albian-Cenomanian Nanushuk Formation in outcrop, central North Slope, Alaska: Report of Investigation RI 2009-1 v. 2, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 76 p., 1 sheet
    Type_of_Source_Media: paper
    Source_Contribution: Outcrop mapping

    Mull, C.G. and others, 2004 (source 5 of 8)
    Mull, C.G., Houseknecht, D.W., Pessel, G.H., and Garrity, C.P., 2004, Geologic map of the Umiat Quadrangle, Alaska: Scientific Investigations Map SIM 2817-A, U.S. Geological Survey, United States.

    Online Links:

    Other_Citation_Details: 1 sheet, scale 1:250,000
    Type_of_Source_Media: paper
    Source_Scale_Denominator: 250000
    Source_Contribution: Outcrop mapping

    Collins, F.R., 1958 (source 6 of 8)
    Collins, F.R., 1958, Test wells, Umiat area, Alaska: Professional Paper P 305-B, U.S. Geological Survey, United States.

    Online Links:

    Other_Citation_Details: p. 71-206, 3 sheets
    Type_of_Source_Media: paper
    Source_Contribution: Interpretive geologic mapping

    Kumar, Naresh and others, 2002 (source 7 of 8)
    Kumar, Naresh, Bird, K.J., Nelson, P.H., Grow, J.A., and Evans, K.R., 2002, A digital atlas of hydrocarbon accumulations within and adjacent to the National Petroleum Reserve-Alaska (NPRA): Open-File Report OF 2002-71, U.S. Geological Survey, United States.

    Online Links:

    Other_Citation_Details: 80 p
    Type_of_Source_Media: digital data
    Source_Contribution: Interpretive geologic mapping

    Robinson, F.M., 1958 (source 8 of 8)
    Robinson, F.M., 1958, Test wells, Gubik area, Alaska: Professional Paper P 305-C, U.S. Geological Survey, United States.

    Online Links:

    Other_Citation_Details: p. 207-264, 2 sheets
    Type_of_Source_Media: paper
    Source_Contribution: Interpretive geologic mapping

  2. How were the data generated, processed, and modified?

    Date: 2011 (process 1 of 4)
    Outcrop mapping - The Alaska Divisions of Geological &amp; Geophysical Surveys (DGGS) and Oil and Gas (DOG) conducted field studies near Umiat, Alaska, examining the region's Cretaceous stratigraphy and structural geology. We conducted two field campaigns in the Umiat-Gubik area, mapping the geology of the Umiat B-5, B-4, B-3, and westernmost part of B-2 quadrangles (1:63,360-scale) on paper topographic maps and approximately 1:60,000-scale aerial photographs (Alaska High Aerial Photography [AHAP] circa 1978-1982). Base camps for these field seasons were set up near the airstrip at Umiat. Field mapping was principally completed with helicopter transportation between widely spaced outcrops. We traversed on foot any laterally extensive or closely spaced outcrops. Tundra-mantled uplands constitute most of the field area and are generally devoid of outcrops, but curvilinear trends of subcrop, rubble-crop, and outcrop occur in hilly terrain northwest of the Colville River (fig. 3D) and were mapped on aerial photographs and satellite imagery. We field-checked many of these traceable beds, which serve as excellent stratigraphic markers that are locally correlated to bluff-scale outcrops, rendering high-confidence stratigraphic and structural constraints in otherwise covered areas. Geologic mapping from the field campaigns was compiled, scanned, georeferenced, and digitized in ESRI ArcGIS ArcMap® software. The mapped surficial geology of sheet 1 is limited to alluvial deposits associated with modern rivers and creeks and simplified from Carter and Galloway (1986). Outcrop distribution is demarcated by map unit polygons with hatched fill (sheet 1). The large, non-hatched swaths of map units that extend across sheet 1 represent the interpreted distribution of the stratigraphy. Geologists observed details about the variations in texture, lithology and orientation of the map units and collected rock samples, noted outcrop descriptions, and conducted structural measurements. Selected samples were submitted for geochronologic and geochemical analysis and the results were used to further interpret the stratigraphic and structural history of the map area. A complete list of references can be found in the accompanying report.

    Data sources used in this process:

    • Brosge, W.P. and Whittington, C.L., 1966
    • Carter, L.D. and Galloway, J.P., 1986
    • Detterman, R.L. and others, 1963
    • LePain, D.L. and others, 2009
    • Mull, C.G. and others, 2004

    Date: 2017 (process 2 of 4)
    Interpretive geologic mapping - Limited bedrock exposures occur in the study area, but the distribution of outcrops, character of the deformation, and exploration data permit interpretative geologic mapping of units that generally lie beneath a thin veneer of tundra. To complete the interpretive mapping, we integrated numerous datasets, including field observations, aerial and satellite imagery, seismic-reflection data, and well logs. A complete list of references and methods can be found in the accompanying report.

    Data sources used in this process:

    • Collins, F.R., 1958
    • Kumar, Naresh and others, 2002
    • Robinson, F.M., 1958

    Date: 2017 (process 3 of 4)
    GIS analysis and digital cartography - The geologic and geographic features portrayed in this data distribution package were attributed according to the NCGMP09 geodatabase standard.

    Date: 2017 (process 4 of 4)
    Technical review - This is a final report of scientific research. It has received technical review and editing by several scientists familiar with the subject matter. We incorporated the reviewers' suggestions into the final draft when deemed appropriate.

  3. What similar or related data should the user be aware of?

    Decker, P.L., 2007, Brookian sequence stratigraphic correlations, Umiat Field to Milne Point Field, west-central North Slope, Alaska: Preliminary Interpretive Report PIR 2007-2, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 19 p., 1 sheet
    Herriott, T.M., Wartes, M.A., Decker, P.L., Gillis, R.J., Shellenbaum, D.P., Mauel, D.J., and Helmold, K.P., 2015, Geologic map of the Umiat-Gubik area, central North Slope, Alaska - Integration of fieldwork and subsurface data in a region of known oil and gas accumulations (poster): Geological Society of America, Cordilleran Section Annual Meeting, May 11-13, 2015, Anchorage, Alaska: Poster and Presentation Herriott, T.M. and others, 2015, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 1 sheet
    Stevens, D.S.P., Reger, R.D., and Smith, R.L., 2003, Survey of geology, geologic materials, and geologic hazards in proposed access corridors in the Umiat Quadrangle, Alaska: Miscellaneous Publication MP 119, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 5 sheets, scale 1:250,000


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

  1. How well have the observations been checked?

    Certainty in attribute interpretation varies throughout the map. Attribute fields within each table record the author's degree of confidence in the existence or identity of applicable features. This publication is a final report of research and has received two technical reviews as well as technical editing.

  2. How accurate are the geographic locations?

    Certainty in feature boundaries or location varies throughout the map. Data fields within each table record the author's degree of confidence in the location of applicable features. Station locations for orientation measurements and rock samples were collected (NAD27 datum) using hand-held recreational grade GPS units, noted in field notebooks, and subsequently transcribed into spreadsheets. Considerable effort was put into identifying and correcting transcription errors, however unidentified location discrepancies may be present.

  3. How accurate are the heights or depths?

  4. Where are the gaps in the data? What is missing?

    This DGGS Report of Investigations is a final report of scientific research. It has received technical review and may be cited as an agency publication. This publication provides information about the mapped and interpreted geologic deposits distinguishable at a scale of about 1:63,600.

  5. How consistent are the relationships among the observations, including topology?

    All polygon features were topologically validated using ArcGIS prior to export to shapefile format. Polygon topology is consistent with the specifications of the NCGMP09 - Draft Standard Format for Digital Publication of Geologic Maps, Version 1.1.


How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?

Access_Constraints:
This report, map, and/or dataset is available directly from the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (see contact information below).
Use_Constraints:
Any hard copies or published datasets utilizing these datasets shall clearly indicate their source. If the user has modified the data in any way, the user is obligated to describe the types of modifications the user has made. The user specifically agrees not to misrepresent these datasets, nor to imply that changes made by the user were approved by the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys. The State of Alaska makes no express or implied warranties (including warranties for merchantability and fitness) with respect to the character, functions, or capabilities of the electronic data or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity whether from the use of the electronic services or products or any failure thereof or otherwise. In no event will the State of Alaska's liability to the Requestor or anyone else exceed the fee paid for the electronic service or product.

  1. Who distributes the data set? (Distributor 1 of 1)

    Alaska Division of Geological & Geophysical Surveys
    Metadata Manager
    3354 College Road
    Fairbanks, AK 99709-3707
    USA

    (907)451-5020 (voice)
    (907)451-5050 (FAX)
    dggspubs@alaska.gov

    Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays
  2. What's the catalog number I need to order this data set?

    RI 2018-6

  3. What legal disclaimers am I supposed to read?

    The State of Alaska makes no expressed or implied warranties (including warranties for merchantability and fitness) with respect to the character, functions, or capabilities of the electronic data or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity whether from the use of the electronic services or products or any failure thereof or otherwise. In no event will the State of Alaska's liability to the Requestor or anyone else exceed the fee paid for the electronic service or product.

  4. How can I download or order the data?


Who wrote the metadata?

Dates:
Last modified: 20-Dec-2018
Metadata author:
Alaska Division of Geological & Geophysical Surveys
Attn: Simone Montayne
Metadata Manager
3354 College Road
Fairbanks, AK 99709-3707
USA

(907)451-5020 (voice)
(907)451-5050 (FAX)
dggspubs@alaska.gov

Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays
Metadata standard:
FGDC Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)
Metadata extensions used:


Generated by mp version 2.9.21 on Thu Dec 20 16:20:14 2018