Surficial geology of Alaska Highway Corridor, Robertson River to Tetlin Junction, Alaska

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

Frequently-anticipated questions:


What does this data set describe?

Title:
Surficial geology of Alaska Highway Corridor, Robertson River to Tetlin Junction, Alaska
Abstract:
During 2008-2010, the Alaska Division of Geological & Geophysical Surveys continued a program, begun in 2006, of reconnaissance mapping of surficial geology in the proposed natural-gas pipeline corridor through the upper Tanana River valley, a 12-mi-wide (19.3-km-wide) area that straddles the Alaska Highway through the upper Tanana River valley from the western boundaries of the Tanacross B-6 and C-6 Quadrangles near the mouth of the Robertson River eastward to the eastern boundaries of the Tanacross A-4 and B-4 Quadrangles near Tetlin Junction. Mapping during 2008-2010 in the Tanacross Quadrangle linked with mapping of surficial geology completed in the Big Delta and Mt. Hayes quadrangles in 2006-2007. Surficial geology was initially mapped in this second corridor segment by interpreting ~1:65,000-scale, false-color, infrared aerial photographs taken in July 1978, August 1980, and July 1983.Verification of photo mapping was accomplished during the 2008-2010 summer field season, when map units were described, soil pits were hand dug, and samples were collected for analyses.
Supplemental_Information:
The DGGS metadata standard extends the FGDC standard to also include elements that are required to facilitate our internal data management. These elements, referred to as 'layers', group and describe files that have intrinsic logical or topological relationships. Each layer is listed and described in detail under its own heading starting 'Entity_Type_Label'. Layers include:
surf_geology	polygons of surficial-geologic map units
fault_features	trace of known active faults discussed in Carver and others, 2010
border		outline shape of the study area
localities	location of soil pits, radiocarbon samples, map localities and ventifact locality discussed in the text
  1. How should this data set be cited?

    Reger, R.D., Hubbard, T.D., and Carver, G.C., 201111, Surficial geology of Alaska Highway Corridor, Robertson River to Tetlin Junction, Alaska: Preliminary Interpretive Report PIR 2009-6A, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, Alaska - USA.

    Online Links:

    Other_Citation_Details: 4 sheets. 1:63,360 scale

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -144.0
    East_Bounding_Coordinate: -142.50000
    North_Bounding_Coordinate: 63.741146
    South_Bounding_Coordinate: 63.166099

  3. What does it look like?

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

    Calendar_Date: Jul-1978
    Currentness_Reference: ground condition

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

    Geospatial_Data_Presentation_Form: document, map sheets and vector 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: 7
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: 0.9996
      Longitude_of_Central_Meridian: -141
      Latitude_of_Projection_Origin: 0
      False_Easting: 500000
      False_Northing: 0

      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 0.0000001
      Ordinates (y-coordinates) are specified to the nearest 0.0000001
      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 1/294.978698.

  7. How does the data set describe geographic features?

    border.shp
    polygon outlining boundary of map area (Source: Alaska Division of Geological & Geophysical Surveys)

    surf_geology.shp
    polygons representing surficial-geologic map units (Source: Alaska Division of Geological & Geophysical Surveys)

    unit_label
    Map unit label shown on map and described in text. Note that "?" indicates questionable identification. Map units shown in parenthesis such as (Qcf), indicate combination map units consisting of bedrock overlain by thin to discontinuous material of the map unit shown. (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    lakeunit is a lake

    Formal codeset
    Codeset Name:PIR2009-6A-unit descriptions
    Codeset Source:This Report

    fault_features.shp
    Trace of identified active faults (Source: Alaska Division of Geological & Geophysical Surveys)

    fault
    Type of fault feature (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    Anticline, approximateApproximate location of anticline
    Anticline, certainCertain location of Anticline
    High Angle, concealedLocation of High Angle fault where concealed.
    Thrust, approximateApproximate location of Thrust fault
    Thrust, certainCertain location of Thrust fault
    Thrust, concealedLocation of Thrust fault where concealed
    High Angle, approximateApproximate location of High Angle fault
    High Angle, certainCertain location of High Angle fault
    Anticline, concealedLocation of anticline where concealed

    descriptn
    fault feature description (Source: Alaska Division of Geological & Geophysical Surveys)

    Description of fault feature shown on map:

    localities.shp
    location of soil pits, radiocarbon samples, map localities and ventifact locality discussed in the text (Source: Alaska Division of Geological & Geophysical Surveys)

    Type
    Type of locality (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    Radio CarbonRadio Carbon locality discussed in text
    Point LocalityPoint locality discussed in text
    Soil PitSoil Pit locality discussed in text
    Ventifact SiteVentifact site discussed in text

    Label
    Label used to identify each locality (Source: Alaska Division of Geological & Geophysical Surveys)

    Label, SP indicates Soil Pit, RC indicates Radio Carbon, V indicates Ventifact site, and A,B, or C indicates Point locality


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 research was supported by Alaska State Capital Improvement Projects funding. The authors gratefully acknowledge the helpful review by De Anne Stevens and Diana Solie as well as able cartographic assistance by Patricia Gallagher, Rachel Westbrook, James Weakland, and Gail Davidson. Much of the work was carried out under the direction of Diana Solie and her leadership was greatly appreciated.

  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

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

    Contact_Instructions:
    You may view our web site at <http://www.dggs.alaska.gov> 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 Alaska Division of Geological & Geophysical Surveys conducted this project, funded by the state legislature, to evaluate the geology, geohazard and material resources along the Alaska Highway corridor from Delta Junction to the Canada border. This was in preparation for a proposed natural gas pipeline, so that a baseline of geologic data would be publicly available upon which preliminary decisions could be made. The work was designed to serve as the springboard for the detailed work which would be required if a pipeline were to be built along this corridor.


How was the data set created?

  1. From what previous works were the data drawn?

    Kreig and Reger, 1976 (source 1 of 26)
    Kreig, R.A., and Reger, R.D., 1976, Preconstruction terrain evaluation for the trans-Alaska pipeline project: Dowden, Hutchinson, and Ross, Stroudsburg.

    Other_Citation_Details: p. 55-76
    This is part of the following larger work.

    Coates, D.R., 2011, Geomorphology and engineering.

    Type_of_Source_Media: paper
    Source_Contribution: Contains terrain evaluation for trans-Alaska oil pipeline

    Kreig and Reger, 1982 (source 2 of 26)
    Kreig, R.A., and Reger, R.D., 1982, Air-photo analysis and summary of landform soil properties along the route of the Trans-Alaska Pipeline System: Geologic Report GR-66, Alaska Division of Geological & Geophysical Surveys, Fairbanks AK.

    Other_Citation_Details: 149 p.
    Type_of_Source_Media: paper
    Source_Contribution:
    Contains air-photo analysis and landform soil properties for trans-Alaska oil pipeline

    Pewe and Reger, 1983 (source 3 of 26)
    Péwé, T.L., and Reger, R.D., 1983, Middle Tanana River valley: Guidebook Guidebook 1, Alaska Division of Geological & Geophysical Surveys, Fairbanks AK.

    Other_Citation_Details:
    in Péwé, T.L., and Reger, R.D., eds., Guidebook to permafrost and Quaternary geology along the Richardson and Glenn Highways between Fairbanks and Anchorage, Alaska, p. 5-45
    This is part of the following larger work.

    Péwé, T.L., ed., and Reger, R.D., ed., 1983, Guidebook to permafrost and Quaternary geology along the Richardson and Glenn Highways between Fairbanks and Anchorage, Alaska: Guidebook Guidebook 1, Alaska Division of Geological & Geophysical Surveys, Fairbanks AK.

    Type_of_Source_Media: paper
    Source_Contribution: Contains information about Quaternary geology of Tanana Valley

    Carter and Galloway, 1978 (source 4 of 26)
    Carter, L.D., and Galloway, J.P., 1978, Preliminary engineering geologic maps of the proposed natural gas pipeline route in the Tanana River valley, Alaska: Open-file report OF 78-794, U.S. Geological Survey, United States.

    Other_Citation_Details: 26 p., 3 map sheets, scale 1:125,000
    Type_of_Source_Media: paper
    Source_Contribution: Engineering geologic maps at 1:125,000

    Carver and others, 2008 (source 5 of 26)
    Carver, G.A., Bemis, S.P., Solie, D.N., and Obermiller, K.E., 200812, Active and potentially active faults in or near the Alaska Highway corridor, Delta Junction to Dot Lake, Alaska: Preliminary Interpretive Report PIR 2008-3D, Alaska Division of Geological & Geophysical, Fairbanks AK.

    Other_Citation_Details: 32 p.
    Type_of_Source_Media: online
    Source_Contribution:
    Source of active faults in segment area just to east of present studyarea

    Duk-Rodkin and others, 2004 (source 6 of 26)
    Duk-Rodkin, Alejandra, Barendregt, R.W., Froese, D.G., Weber, Florence, Enkin, Randy, Smith, I.R., Waters, Pamela, and Klassen, Rudy, 2004, Timing and extent of Plio-Pleistocene glaciations in northwestern Canada: Development in Quaternary Science v.2, Elsevier, New York.

    Other_Citation_Details: p. 313-345
    This is part of the following larger work.

    Ehlers, J., and Gibbard, P.L., 2004, Quaternary glaciations-extent and chronology, part II: North America: Development in Quaternary Science v. 2, Elsevier, New York.

    Other_Citation_Details: p. 313-345
    Type_of_Source_Media: paper
    Source_Contribution: Information about timing of glaciation in Canada and Alaska

    Hamilton, 1994 (source 7 of 26)
    Hamilton, T.D., 1994, Late Cenozoic glaciation of Alaska: Geology of North America v. G-1, Geological Society of America, United States.

    Other_Citation_Details: p. 813-844
    This is part of the following larger work.

    Plafker, George, and Berg, H.C., 1994, The Geology of Alaska: Geology of North America v. G-1, Geological Society of America, United States.

    Other_Citation_Details: p. 813-844
    Type_of_Source_Media: paper
    Source_Contribution: Late Cenozoic glaciation of Alaska

    Holmes, 1965 (source 8 of 26)
    Holmes, G.W., 1965, Geologic reconnaissance along the Alaska Highway, Delta River to Tok Junction, Alaska: Bulletin B 1181-H, U.S. Geological Survey, United States.

    Other_Citation_Details: 19 p., 1 map sheet, scale 1:125,000.
    Type_of_Source_Media: paper
    Source_Contribution:
    Geologic reconnaissance along the Alaska Highway, Delta River to Tok Junction

    Mason and Beget, 1991 (source 9 of 26)
    Mason, O.K., and Begét, J.E., 1991, Late Holocene flood history of the Tanana River, Alaska: Arctic and Alpine Research, United States.

    Other_Citation_Details: v. 23, no. 4, p. 392-403.
    Type_of_Source_Media: paper
    Source_Contribution: Holocene flooding in Tanana valley

    Pewe, 1975 (source 10 of 26)
    Péwé, T.L., 1975, Quaternary geology of Alaska: Professional Paper P 835, U.S. Geological Survey, United States.

    Other_Citation_Details: 145 p.
    Type_of_Source_Media: paper
    Source_Contribution: Quaternary geology of Alaska

    Weber, 1986 (source 11 of 26)
    Weber, F.R., 1986, Glacial geology of the Yukon-Tanana Upland: Alaska Geological Society, Anchorage, Alaska.

    Other_Citation_Details: p. 79-98.
    This is part of the following larger work.

    Hamilton, T.D., ed., Reed, K.M., ed., and Thorson, R.M., ed., 1986, Glaciation in Alaska; The geologic record: Alaska Geological Society, Anchorage, Alaska.

    Other_Citation_Details: p. 79-98.
    Type_of_Source_Media: paper
    Source_Contribution: Glacial geology of the Yukon-Tanana Upland

    USGS Tanacross A-4, 1948- minor revisions 1973 (source 12 of 26)
    U.S. Geological Survey, 1948, Tanacross A-4 Quadrangle: U.S. Geological Survey, Reston, VA.

    Other_Citation_Details: scale 1:63,360
    Type_of_Source_Media: All Topo software
    Source_Scale_Denominator: 63360
    Source_Contribution: base map

    USGS Tanacross B-4, 1949- minor revisions 1994 (source 13 of 26)
    U.S. Geological Survey, 1949, Tanacross B-4 Quadrangle: U.S. Geological Survey, Reston, VA.

    Other_Citation_Details: scale 1:63,360
    Type_of_Source_Media: All Topo software
    Source_Scale_Denominator: 63360
    Source_Contribution: base map

    USGS Tanacross B-5, 1948- minor revisions 1994 (source 14 of 26)
    U.S. Geological Survey, 1948, Tanacross B-5 Quadrangle: U.S. Geological Survey, Reston, VA.

    Other_Citation_Details: scale 1:63,360
    Type_of_Source_Media: All Topo software
    Source_Scale_Denominator: 63360
    Source_Contribution: base map

    USGS Tanacross B-6, 1949- minor revisions 1970 (source 15 of 26)
    U.S. Geological Survey, 1949, Tanacross B-6 Quadrangle: U.S. Geological Survey, Reston, VA.

    Other_Citation_Details: scale 1:63,360
    Type_of_Source_Media: All Topo software
    Source_Scale_Denominator: 63360
    Source_Contribution: base map

    USGS Tanacross C-6, 1955- minor revisions 1982 (source 16 of 26)
    U.S. Geological Survey, 1955, Tanacross C-6 Quadrangle: U.S. Geological Survey, Reston, VA.

    Other_Citation_Details: scale 1:63,360
    Type_of_Source_Media: All Topo software
    Source_Scale_Denominator: 63360
    Source_Contribution: base map

    AHAP Aerial Photography (source 17 of 26)
    U.S. Geological Survey, Unknown, Alaska High Altitude Photography Program: U.S. Geological Survey, Unknown.

    Type_of_Source_Media: photographic print
    Source_Scale_Denominator: 65000
    Source_Contribution: Aerial photography used in map unit interpretation

    Carrara, 2004a (source 18 of 26)
    Carrara, P.E., 2004, Surficial Geologic map of the Tanacross B-6 Quadrangle, east-central Alaska: U.S. Geological Survey Scientific Investigations Map 2850, US Geological Survey, Denver, CO.

    Other_Citation_Details: 1 map sheet
    Type_of_Source_Media: paper
    Source_Scale_Denominator: 63360
    Source_Contribution:
    Contains geologic information about the Tanacross B-6 Quadrangle

    Carrara, 2004b (source 19 of 26)
    Carrara, P.E., 2004, Surficial geologic map of the Tanacross B-5 Quadrangle, east-central Alaska: U.S. Geological Survey Scientific Investigations Map 2856, US Geological Survey, Denver, CO.

    Other_Citation_Details: 1 sheet
    Type_of_Source_Media: paper
    Source_Scale_Denominator: 63360
    Source_Contribution:
    Contains geologic information about the Tanacross B-5 Quadrangle

    Carrara, 2006 (source 20 of 26)
    Carrara, P.E., 2006, Surficial geologic map of the Tanacross B-4,Quadrangle east-central Alaska: U.S. Geological Survey Scientific Investigations Map 2935, U.S. Geological Survey, Denver, CO.

    Other_Citation_Details: 1 sheet- 63,360
    Type_of_Source_Media: paper
    Source_Scale_Denominator: 63360
    Source_Contribution:
    Contains geologic information about the tanacross B-4 Quadrangle

    Carver and others, 2010 (source 21 of 26)
    Carver, G.A., Bemis, S.P., Solie, D.N., Castonguay, S.R., and Obermiller, K.E., 2010, Active and potentially active faults in or near the Alaska Highway corridor, Dot Lake to Tetlin Junction: Preliminary Interpretive Report PIR 2010-1, Alaska Division of Geological & Geophysical Surveys, Fairbanks, AK.

    Type_of_Source_Media: paper
    Source_Contribution:
    Contains information about recent faulting activity in the area.

    Foster, 1970 (source 22 of 26)
    Foster, H.L., 1970, Reconnaissance geologic map of the Tanacross Quadrangle, Alaska: U.S. Geological Survey Miscellaneous Geologic Investigations Map I-593, U.S. Geological Survey, united states.

    Other_Citation_Details: 1 sheet
    Type_of_Source_Media: paper
    Source_Scale_Denominator: 250000
    Source_Contribution: Contains geologic information about the Tanacross Quadrangle

    Foster and Keith, 1969 (source 23 of 26)
    Foster, H.L., and Keith, T.E.C., 1969, Geology along the Taylor Highway, Alaska: U.S. Geological Survey Bulletin B 1281, U. S. Geological Survey, United States.

    Type_of_Source_Media: paper
    Source_Contribution: Contains information about geology along the Taylor Highway

    Grahek and Livingston, 1983 (source 24 of 26)
    Grahek, M.E., and Livingston, H.R., 1983, Alaska Department of Transportation and Public Facilities Engineering Geology Soils report - Centerline soils and materials sources, Mile Post 1346.7 to 1332.8, Alaska highway, Robertson River to Yerrick Creek, Project No. F-062-2(14): Alaska Department of Transportation and Public Facilities, United States.

    Type_of_Source_Media: paper
    Source_Contribution: Contains information about unconsolidated materials in the area

    Hemenway and Weaver, 1983 (source 25 of 26)
    Hemenway, K.T., and Weaver, M., 2009, Alaska Department of Transportation and Public Facilities Foundation report - Alaska Highway bridges, Mile Post 1332.8 to 1346.7, Alaska Highway, Yerrick Creek to Robertson River, Project No. F-062-2(14): Alaska Department of Transportation and Public Facilities, United States.

    Type_of_Source_Media: paper
    Source_Contribution: Contains information about unconsolidated materials in the area

    USGS Tanacross A-5, 1949- minor revisions 1973 (source 26 of 26)
    U.S. Geological Survey, 1948, Tanacross A-5 Quadrangle: U.S. Geological Survey, Reston, VA.

    Other_Citation_Details: scale 1:63,360
    Type_of_Source_Media: All Topo Software
    Source_Scale_Denominator: 63360
    Source_Contribution: base map

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

    Date: 2008 (process 1 of 6)
    Aerial photograph interpretation - Stereo pairs of ~1:65000-scale, false-color infrared aerial photographs taken in July 1978, August 1980 and July 1983, as well as data from published and unpublished mapping of the target region and adjacent regions, were used to initially interpret and map the surficial geology. Unit boundaries were drawn by hand onto acetate overlays, using a magnifying stereoscope. Overlays were registered to aerial photos using tick marks on the photos.

    Data sources used in this process:

    • Krieg and Reger, 1976
    • Kreig and Reger, 1982
    • Carter and Galloway, 1978
    • Holmes, 1965
    • AHAP Aerial Photography
    • Carrara, 2004a
    • Carrara, 2004b
    • Carrara, 2006
    • Foster, 1970
    • Foster and Keith, 1970
    • Grahek and Livingston, 1983
    • Hemenway and Weaver, 1983
    • Pewe and Reger, 1983

    Date: 2008 (process 2 of 6)
    Digital cartography - The acetate overlays were individually scanned and orthorectified, using Orthomapper, v. 3.6, and georeferenced. The air-photos were orthorectified, photomosaiced and georeferenced. Map unit boundaries were digitized on-screen into ArcGIS from the orthorectified overlays at a scale more detailed than 1:63,360, using a combination of a USGS topographic 1:63.360 map layer and the orthophotomosaic layer to verify the position of the lines. Surficial geology map polygons and lines were then edited and attributed using ArcMap 9+

    Data sources used in this process:

    • USGS Tanacross A-4, 1948
    • USGS Tanacross A-5. 1949
    • USGS Tanacross B-4, 1949
    • USGS Tanacross B-5, 1948
    • USGS Tanacross B-6, 1949
    • USGS Tanacross C-6, 1955
    • AHAP Aerial Photography

    Date: 2008 (process 3 of 6)
    Fieldwork - Reconnaissance field work was done in the summer of 2007 during which observations were recorded for use during aerial photograph interpretation. In July-August 2008, field work to verify aerial photograph interpretations was performed. In addition to observations from ground and helicopter traverses, several soil pits were dug using shovels to maximum depth of 1.3 meters to observe soil profiles, and observations of exposures along river banks, highway cuts, and trenches dug as part of active fault studies were recorded.

    Data sources used in this process:

    • Pewe and Reger, 1983
    • Carver and others, 2008
    • Duk-Rodkin and others, 2004
    • Hamilton, 1994
    • Mason and Beget, 1991
    • Pewe, 1975
    • Weber, 1986
    • Carver and others, 2010

    Date: 2011 (process 4 of 6)
    Map compilation - The surficial geologic map was compiled using field notes from fieldwork process step (above), all known geologic data from previous work in the quadrangle and by additional aerial photographic interpretation. Changes to unit boundaries, after field work, were completed in ArcGIS. 9+. GIS files were exported and Adobe Illustrator and Microsoft Word were used to create the final map layout.

    Date: 2009 (process 5 of 6)
    Radiocarbon data - radiocarbon samples were collected during field work in the summer of 2008 by Dick Reger and Trent Hubbard. Samples were sent to Beta Analytic for analysis in early 2009

    Date: 2011 (process 6 of 6)
    Metadata creation - Metadata were assembled by T.D. Hubbard and P.E. Gallagher to FGDC Standards using Metavist 1.2, DGGS 7.05, a data entry program for FGDC metadata with XML output.

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

    Reger, R.D., and Hubbard, T.D., 2010, Reconnaissance interpretation of 1978-1983 permafrost, Alaska Highway Corridor, RobertsonRiver to Tetlin Junction, Alaska: Preliminary Interpretive Report PIR 2009-6C, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.

    Online Links:

    Other_Citation_Details: 4 sheets, 1:63,360 scale.
    Hubbard, T.D., and Reger, R.D., 2010, Engineering-geologic map of the Alaska Highway Corridor, Robertson River to Tetlin Junction, Alaska: Preliminary Interpretive Report PIR 2009-6B, State of Alaska, Department of Natural Resources,, Fairbanks, Alaska - USA.

    Online Links:

    Other_Citation_Details: 4 sheets 1:63,360 scale
    Reger, R.D., Stevens, D.S.P., and Solie, D.N., 2008, Surficial-geologic map, Alaska Highway Corridor, Delta Junction to Dot Lake, Alaska: Preliminary Interpretive Report PIR 2008-3A, Alaska Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.

    Other_Citation_Details: 2 sheets, scale 1:63,360
    Reger, R.D., and Solie, D.N., 2008, Engineering-geologic map, Alaska Highway Corridor, Delta Junction to Dot Lake, Alaska: Preliminary Interpretive Report PIR 2008-3B, Alaska Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.

    Other_Citation_Details: 2 sheets, scale 1:63,360
    Reger, R.D., and Solie, D.N., 2008, Reconnaissance interpretation of permafrost, Alaska Highway Corridor, Delta Junction to Dot Lake, Alaska: Preliminary Interpretive Report PIR 2008-3C, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.

    Online Links:

    Other_Citation_Details: 10 p., 2 sheets, scale 1:63,360
    Carver, G.A., Bemis, S.P., Solie, D.N., Castonguay, S., and Obermiller, K.E., 2010, Active and potentially active faults in or near the AlaskaHighway Corridor, Dot Lake to Tetlin Junction, Alaska: Preliminary Interpretive Report PIR 2010-1, Alaska Division of Geological & Geophysical Surveys, Fairbanks , Alaska.

    Carver, G.A., Bemis, S.P., Solie, D.N., and Obermiller, K.E., 200812, Active and potentially active faults in or near the Alaska Highway corridor, Delta Junction to Dot Lake, Alaska: preliminary interpretive report PIR 2008-D, Alaska Division of Geological & Geophysical Surveys, Fairbanks, AK.

    Other_Citation_Details: 32 p.
    Reger, R.D., and Hubbard, T.D., 200910, Evidence for late Wisconsinan outburst floods in the Tok-Tanacross Basin. upper Tanana River Valley, east-central Alaska (abs); Geological Society of America Abstracts with Programs: Geological Society of America Abstracts with Programs V. 41, No. 7, Geological Society of America, Boulder, CO.

    Other_Citation_Details: p. 637
    Hubbard, T.D., and Reger, R.D., 201010, Model for Late Wisconsinan Massive Outburst Flooding, Tok River Valley, Northeastern Alaska Range: Geological Society of America Abstracts with Programs vol. 42, No. 5, Geological Society of America, Boulder, CO.

    Other_Citation_Details: 703 p. Abstract on p. 310


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

  1. How well have the observations been checked?

    Soil colors were described using the Munsell soil color charts. The Wentworth scale was used for grain size classification. Soil horizon descriptions in the map area used the U.S. Soil Conservation Service soil taxonomy (Soil Survey Staff, 1975). Sediment samples were collected for sieve analysis and radiocarbon age dating. Analytical data described above were utilized in developing the geologic interpretations presented in this report. The accuracy of the map unit boundary locations vary due to the scale and interpretive nature of the mapping but are expected to be accurate to at least 50 ft. Map units labeled with a "?" are considered to have an uncertain assignation. Information from previous geologic reports was incorporated during the interpretation process. To check attribute accuracy of the digital files we visually compared the original compilation against test plots of the files and corrected discrepancies between the digital geospatial dataset and the original analog as needed. The geologic interpretations presented in this report have undergone two technical reviews by a geologist familiar with the subject of the report and the geology of the map area. We incorporated the reviewer's suggestions into the final draft when deemed appropriate.

  2. How accurate are the geographic locations?

    The surficial interpretations were first hand-drawn, using a magnifying stereoscope, onto acetate air-photo overlays at the scale of the air-photos (approximately 1:63,360-scale). The accuracy of the map unit boundary locations varies due to the scale and interpretive nature of the mapping and pen line width of approximately 0.001 meters which is equivalent to approximately 1.5 meters on the ground. The hand drawn map unit boundaries are expected to be accurate to at least 15 meters. Following interpretation, acetate overlays were then individually scanned, orthorectified and georeferenced using Orthomapper, v. 3.6. The air-photos were orthorectified, photo-mosaiced and georeferenced. Surficial unit boundaries were digitized on-screen into ArcGIS from the orthorectified overlays at a scale more detailed than 1:63,360, using a combination of a USGS topographic 1:63.360 map layer and the air-photo photomosaic layer to verify the position of the lines and points. Map error is induced by: (1) Scanning and orthorectifying air photos and overlays. The digitizing RMS error is generally constrained to be less than 4 pixels, equating to approximately 20 m on the ground, although some areas with rugged terrain have larger errors. 2) On-screen digitizing from orthorectified overlays. The accuracy of the human operator digitizing polylines and point localities is related to the accuracy of interpretations from the orthorectified photos and overlays. Total horizontal accuracy of the mapped surficial-geologic contacts is thus on the order of 25 m or better, with somewhat lesser accuracy expected in areas of rugged relief. Coordinates of soil pits, radiocarbon sampling localities, and other field sites that are discussed in the text were recorded using a Garmin GPS model 76CSx with an estimated precision generally less than 10 meters.

  3. How accurate are the heights or depths?

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

    This dataset includes shapefiles that contain information surficial geologic units and fault traces mapped in this area. This data set utilizes field observations and air photo interpretations. It includes geospatial information about units traceable on air photos at a scale of ~1:65000 and/or in the field. The dataset displays: surficial geologic units and contacts, inferred geologic contacts, fault traces and point localities discussed in the text. Subsurface data available for this investigation include: about 10-15 soil pits dug to depths no more than 1.3 m; observations of exposures in gravel pits, highway cuts, and river bank; and several trench exposures excavated as part of work for an ADGGS preliminary interpretive report describing active faulting in this area. The active faults shown on the map sheets are more fully described in an ADGGS preliminary Interpretive Report by Carver and other (2010).

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

    Polygon topology is present and clean on the originating geospatial dataset. All polygon features were topologically validated using the ESRI ArcGIS 10+ software prior to export to shape file format. The logical consistency of the point and line files has been visually checked but not systematically verified.


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. 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)

    State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys
    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 website (<http://www.dggs.alaska.gov>) 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?

  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?


Who wrote the metadata?

Dates:
Last modified: 07-Dec-2011
Metadata author:
Metadata manager
3354 College Road
Fairbanks, AK 99709-3707
USA

907-451-5020 (voice)

Metadata standard:
FGDC Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)
Metadata extensions used:


Generated by mp version 2.9.6 on Thu Dec 8 12:55:26 2011