Surficial geology of the Dalton Highway (Itkillik-Sagavanirktok rivers) area, southern Arctic foothills, Alaska

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Frequently-anticipated questions:


What does this data set describe?

Title:
Surficial geology of the Dalton Highway (Itkillik-Sagavanirktok rivers) area, southern Arctic foothills, Alaska
Abstract:
This report provides detailed (1:63,360-scale) surficial-geologic mapping in the Dalton Highway area, from the Sagavanirktok to the Itkillik Rivers, in the west-central Philip Smith Mountains quadrangle. The map area extends from the northern flank of the Endicott Mountains into the Arctic Foothills province.
Supplemental_Information:
The layers listed below are present as ArcGIS shape files. To enhance print quality, this publication utilized a vector topography data set (released as an add-on to the DGGS publication PIR 2002-2). The topography data set is not included with this release. Attribute information for the following layers (entities) is included in this metadata file under the "Entity_and_Attribute_Information" section. Each layer is listed and described in detail under its own heading starting "Entity_Type_Label." Basic unit information is also included in the geologic unit code set file "PR121_codeset.pdf". Layers include:
moraines_polygon      polygon indicating the location of a prominent end moraine
stations_point      radiocarbon sample locality
surfgeology_arc     geologic unit contacts
surfgeology_polygon      geologic unit polygons
symbols_arc    symbols depicting locations of morainal crests, meltwater drainage channels, and glacial flow direction
symbols_point     symbols showing relative motion and/or orientation of geomorphic features
  1. How should this data set be cited?

    Hamilton, T.D., 200306, Surficial geology of the Dalton Highway (Itkillik-Sagavanirktok rivers) area, southern Arctic foothills, Alaska: Professional Report PR 121, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (DGGS), Fairbanks, AK, USA.

    Online Links:

    Other_Citation_Details: 32 p., 1 sheet, scale 1:63,360

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -150.000000
    East_Bounding_Coordinate: -149.000000
    North_Bounding_Coordinate: 68.779444
    South_Bounding_Coordinate: 68.439167

  3. What does it look like?

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

    Beginning_Date: 1984
    Ending_Date: 2003
    Currentness_Reference: June 2003 (publication date)

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

    Geospatial_Data_Presentation_Form: map and vector digital data

  6. How does the data set represent geographic features?

    1. How are geographic features stored in the 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: 6
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: 0.999600
      Longitude_of_Central_Meridian: -147.000000
      Latitude_of_Projection_Origin: 0.000000
      False_Easting: 500000.000000
      False_Northing: 0.000000

      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 0.000064
      Ordinates (y-coordinates) are specified to the nearest 0.000064
      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 6,378,206.4.
      The flattening of the ellipsoid used is 1/294.98.

  7. How does the data set describe geographic features?

    surfgeology_arc table
    Object type is vector, there are 1215 rows associated with this entity, and the entity values refer to geologic unit contacts. (Source: Alaska Division of Geological & Geophysical Surveys)

    SYMBOL
    Geologic contact classification (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    0contact boundary for water-eroded drift
    5geologic unit contact location certain
    6geologic unit contact location approximate or inferred

    surfgeology_polygon table
    Object type is vector, there are 442 rows associated with this entity, and the entity values refer to geologic unit polygons (Source: Alaska Division of Geological & Geophysical Surveys)

    UNIT
    unit labels (Source: Alaska Division of Geological & Geophysical Surveys)

    Formal codeset
    Codeset Name:PR121_codeset.pdf
    Codeset Source:Alaska Division of Geological & Geophysical Surveys <http://www.dggs.dnr.state.ak.us/metadata/PR121_codeset.pdf>

    stations_point table
    Object type is point, there are 14 rows associated with this entity, and the entity values refer to radiocarbon sample locations (Source: Alaska Division of Geological & Geophysical Surveys)

    STATION
    radiocarbon sample location label (Source: Alaska Division of Geological & Geophysical Surveys)

    Attribute values do not follow a specific naming convention.

    symbols_point table
    Object type is point, there are 73 rows associated with this entity, and the entity values refer to label points of map symbols showing relative motion and/or orientation of geomorphic features. (Source: Alaska Division of Geological & Geophysical Surveys)

    SYMBOL
    type of map symbol (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    17morainal crest
    101arrow symbol indicating the endpoint of a meltwater drainage channel
    125arrow symbol indicating the direction of glacial flow across topographic divide

    ANGLE
    This field contains the rotation angle data that corresponds with each symbol class contained in the "SYMBOL" field of this table. Rotation angles are measured arithmetically. A value of 0 corresponds to an arrow pointing due east. (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:-180
    Maximum:335
    Units:degrees

    moraines_polygon table
    Object type is vector, there are 12 rows associated with this entity, and the entity values refer to location and extent of prominent end moraines. (Source: Alaska Division of Geological & Geophysical Surveys)

    symbols_arc table
    Object type is vector, there are 76 rows associated with this entity, and the entity values refer to morainal crests, meltwater drainage channels or direction of glacial flow across a topographic divide. (Source: Alaska Division of Geological & Geophysical Surveys)

    CODE
    symbol type (Source: Alaska Division of Geological & Geophysical Surveys and others (see reference attribute information))

    ValueDefinition
    1morainal crest or meltwater drainage channel
    2direction of glacial flow across a topographic divide


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?

    Funding for the geologic mapping and geochronologic dating performed for this project was provided by the U.S. Geological Survey STATEMAP Program under award number 03HQAG0055 and by the Alaska State Legislature. Geologic field investigations by: T.D. Hamilton with: Alyeska Pipeline Service Company (1969-72); U.S. Geological Survey (1975-76); University of Colorado, Institute of Arctic & Alpine Research (1996-97); and Alaska Division of Geological & Geophysical Surveys (2001). Assisted by R.M. Thorson (1975-76) and D.S.P. Stevens (2001). Technical review by: R.A. Combellick and D.S. Kaufman. Digital cartography and map design by: Simone Montayne, E.E. Harris, and A.G. Sturmann. Edited by: Paula Davis and E.E. Harris

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

    State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys
    GIS Data Manager/Cartographer
    3354 College Road
    Fairbanks, AK 99709-3707
    USA

    (907) 451-5029 (voice)
    (907) 451-5050 (FAX)
    dggspubs@alaska.gov

    Contact_Instructions:
    You may view our web site at <http://www.dggs.dnr.state.ak.us> for the latest information on available data. Please e-mail your questions and data requests when possible since our web site and e-mail address will remain current even if our phone number and mailing address change.


Why was the data set created?

The surficial-geologic map from the Sagavanirktok to the Itkillik Rivers was selected by the Alaska Division of Geological & Geophysical Surveys (DGGS) for detailed (1:63,360-scale) mapping to document depositional relationships and the extent of surficial deposits near the Dalton Highway on the North Slope of Alaska. This map provides a comprehensive understanding of Northern Alaska glaciation. Detailed surficial mapping is an important first step in creating engineering-geologic maps to identify construction materials needed for maintenance and development of the infrastructure that connects and supports the North Slope oil fields.


How was the data set created?

  1. From what previous works were the data drawn?

    Brosgé and others (1979) (source 1 of 7)
    Brosgé, W.P., Reiser, H.N., Dutro, J.T., Jr., and Detterman, R.L., 1979, Bedrock geologic map of the Philip Smith Mountains quadrangle, Alaska: Miscellaneous Field Investigations Map MF-879-B, U.S. Geological Survey, none.

    Online Links:

    • none

    Other_Citation_Details: 1 sheet
    Type_of_Source_Media: paper
    Source_Scale_Denominator: 250000
    Source_Contribution:
    This publication was used to plan traverses and help define geologic units.

    Detterman and others (1958) (source 2 of 7)
    Detterman, R.L., Bowsher, A.L., and Dutro, J.T., Jr., 1958, Glaciation on the Arctic Slope of the Brooks Range, northern Alaska: Arctic v. 11, none, none.

    Online Links:

    • none

    Other_Citation_Details: p. 43–61
    Type_of_Source_Media: paper
    Source_Contribution:
    This publication was used to plan traverses and help define geologic units.

    Ellis and Calkin (1984) (source 3 of 7)
    Ellis, J.M., and Calkin, P.E., 1984, Chronology of Holocene glaciation, central Brooks Range, Alaska: Geological Society of America Bulletin v. 95, Geological Society of America, none.

    Online Links:

    • none

    Other_Citation_Details: p. 897–912
    Type_of_Source_Media: paper
    Source_Contribution:
    This publication was used to plan traverses and help define geologic units.

    Hamilton (1978) (source 4 of 7)
    Hamilton, T.D., 1978, Surficial geologic map of the Philip Smith Mountains quadrangle, Alaska: Miscellaneous Field Studies Map MF-879-A, U.S. Geological Survey, none.

    Online Links:

    • none

    Other_Citation_Details: 1 sheet
    Type_of_Source_Media: paper
    Source_Contribution:
    This publication was used to plan traverses and help define geologic units.

    Hamilton (1979) (source 5 of 7)
    Hamilton, T.D., 1979, Radiocarbon dates and Quaternary stratigraphic sections, Philip Smith Mountains quadrangle, Alaska: Open File Report OF 79-866, U.S. Geological Survey, none.

    Online Links:

    • none

    Other_Citation_Details: 44 p.
    Type_of_Source_Media: paper
    Source_Contribution:
    This publication was used to plan traverses and help define geologic units.

    Hamilton (1982) (source 6 of 7)
    Hamilton, T.D., 1982, A late Pleistocene glacial chronology for the southern Brooks Range—stratigraphic record and regional significance: Geological Society of America Bulletin v. 93, Geological Society of America, none.

    Online Links:

    • none

    Other_Citation_Details: p. 700–716
    Type_of_Source_Media: paper
    Source_Contribution:
    This publication was used to plan traverses and help define geologic units.

    Hamilton and Porter (1975) (source 7 of 7)
    Hamilton, T.D., and Porter, S.C., 1975, Itkillik glaciation in the Brooks Range, northern Alaska: Quaternary Research v. 5, none, none.

    Online Links:

    • none

    Other_Citation_Details: p. 471–497
    Type_of_Source_Media: paper
    Source_Contribution:
    This publication was used to plan traverses and help define geologic units.

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

    Date: 1969 (process 1 of 4)
    Data Compilation - Geologic information from relevant literature was used to plan traverses and help define geologic units.

    Data sources used in this process:

    • Brosgé and others (1979)
    • Detterman and others (1958)
    • Ellis and Calkin (1984)
    • Hamilton (1978)
    • Hamilton (1979)
    • Hamilton (1982)
    • Hamilton and Porter (1975)

    Date: 1969 (process 2 of 4)
    Fieldwork- The data collected in this report is a summation of multiple summer field investigations, 1969-72, 1975-76, 1996-97, and 2001. Field notes and sediment samples from traverses, road cut investigations, and river exposures were collected throughout the quadrangle. Observations were recorded on 1:50,000 scale (nominal) color-infrared aerial photographs and 1:63,360 scale topographic base maps. Stations located using air photos and hand held GPS devices with location precision varying from +/-3 to 15 meters.

    Data sources used in this process:

    • Hamilton (1978)
    • Hamilton (1979)
    • Hamilton (1982)
    • Hamilton and Porter (1975)

    Date: 1969 (process 3 of 4)
    Laboratory data compilation- Laboratory analyses were performed on radiocarbon samples.

    Data sources used in this process:

    • Hamilton (1978)
    • Hamilton (1979)
    • Hamilton (1982)
    • Hamilton and Porter (1975)

    Date: 2001 (process 4 of 4)
    Geologic map compilation- The geologic map was compiled using field notes from fieldwork process step (above), analytical results from laboratory data compilation process step (above), and all known geologic data from previous work in quadrangle. Geologic map contacts were delineated by photo interpretation of 1:50,000-scale color-infrared aerial photographs onto clear acetate overlays. The contacts were transferred from the overlays onto paper USGS 1:63,360 topographic base maps using a zoom transfer scope, and the contacts were then digitized using ArcEdit. Line work was edited using ArcEdit, and polygon topology generated and unit designations assigned using ArcInfo and ArcEdit. ArcPlot was used to generate plot files using DGGS-standard symbology, and the Arc graphics files were converted into .eps files for export to Corel Draw for final cartographic assembly.

    Data sources used in this process:

    • Brosgé and others (1979)
    • Detterman and others (1958)
    • Ellis and Calkin (1984)
    • Hamilton (1978)
    • Hamilton (1979)
    • Hamilton (1982)
    • Hamilton and Porter (1975)

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

    Harris, E.E., Mull, C.G., Reifenstuhl, R.R., and Montayne, Simone, 2002, Geologic map of the Dalton Highway (Atigun Gorge to Slope Mountain) area, southern Arctic Foothills, Alaska: Preliminary Interpretive Report PIR 2002-2, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.

    Online Links:

    Other_Citation_Details: 1 sheet, scale 1:63,360


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

  1. How well have the observations been checked?

    Geologic data used in the compilation was derived from the field maps and notes generated by this project as well as data from other sources as noted in the "Source_Information" section. Location data for geologic point coverages was acquired from hand held GPS units and compiled on paper field maps, air photos, and notebooks. A paper compilation map composed of all of the geologic information elements was scanned and digitized using a digitizing tablet. Spatial data attributes were attached to data objects using ArcInfo. Attributes were verified for consistency and completeness during the creation of the metadata.

  2. How accurate are the geographic locations?

    Location data and estimated position errors were manually entered into a spreadsheet. Sample numbers and locations with selected data were spatially registered and analyzed in ArcGIS software. Location data was determined visually using topographic maps at a scale of 1:63,360 and 1:50,000 (nominal) scale, color-infrared aerial photographs. See "Source_Information" section for horizontal positional accuracy of locations not measured by DGGS.

  3. How accurate are the heights or depths?

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

    This data set includes coverages that contain information about geologic units, their ages, and field sample locations at 1:63,360 scale.

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

    Topology is present on appropriate polygon and line data tables; others are point data tables.


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 data set are 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 data sets utilizing these data sets 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. User specifically agrees not to misrepresent these data sets, 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.

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

    State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys
    Natural Resource Technician
    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
    Contact_Instructions:
    Please view our web site (<http://www.dggs.dnr.state.ak.us>) for the latest information on available data. Please contact us using the e-mail address provided above when possible.
  2. What's the catalog number I need to order this data set?

    Professional Report 121

  3. What legal disclaimers am I supposed to read?

    The State of Alaska makes no express or implied warranties (including warranties of merchantability and fitness) with respect to the character, function, or capabilities of the electronic services 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, any failure thereof, or otherwise, and in no event will the State of Alaska's liability to the requester or anyone else exceed the fee paid for the electronic service or product.

  4. How can I download or order the data?

  5. What hardware or software do I need in order to use the data set?

    Please check the MapInfo web site (<http://www.mapinfo.com/>) for the latest documentation on importing ESRI shape files.


Who wrote the metadata?

Dates:
Last modified: 06-May-2008
Last Reviewed: 06-May-2008
To be reviewed: 05-Nov-2009
Metadata author:
State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys
Metadata Manager
3354 College Road
Fairbanks, AK 99709-3707
USA

907-451-5039 (voice)
907-451-5050 (FAX)
dggspubs@dnr.state.ak.us

Contact_Instructions:
Please contact us through the e-mail address above whenever possible.
Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)


Generated by mp version 2.9.6 on Tue May 06 14:29:37 2008