Engineering-geologic map of the Eagle A-1 Quadrangle, Fortymile mining district, Alaska

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

Frequently-anticipated questions:


What does this data set describe?

Title:
Engineering-geologic map of the Eagle A-1 Quadrangle, Fortymile mining district, Alaska
Abstract:
The Alaska Division of Geological & Geophysical Surveys (DGGS) has conducted 1:63,360-scale geologic mapping of the Eagle A-1 Quadrangle. The area is part of the 100-year old Fortymile mining district and is located in eastern Alaska near the Alaska-Yukon border. This map illustrates potential near-surface sources of various geologic materials that may be useful for construction. Field observations indicate that each geologic unit (for example, stream alluvium) has a definite composition or range of composition. Therefore, the probable presence of materials is interpreted from the distribution of geologic units on the geologic map of this quadrangle. This map is generalized and is not intended to show exact locations of specific materials. Local variations are common, especially near unit boundaries. The map was derived electronically from the geologic map of the area using Geographic Information System (GIS) software. It is locally verified by ground observations during field visits. The results should be considered reconnaissance in nature.
Supplemental_Information:
The DGGS metadata standard extends the FGDC standard to 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. Attribute information for the layers (entity) is included in this metadata file under the "Entity_and_Attribute_Information" section. The layers are titled:
border: outline shape of the study area
contact: engineering-geologic unit outlines
materials: engineering-geologic units
photolinear: linear features visible on aerial photographs
pingo: pingo locations
  1. How should this data set be cited?

    Stevens, D.S.P., 2012, Engineering-geologic map of the Eagle A-1 Quadrangle, Fortymile mining district, Alaska: Preliminary Interpretive Report PIR 2002-1D, Alaska Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.

    Online Links:

    Other_Citation_Details: 1 sheet, scale 1:63,360

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -141.50
    East_Bounding_Coordinate: -141.00
    North_Bounding_Coordinate: 64.25
    South_Bounding_Coordinate: 64.00

  3. What does it look like?

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

    Calendar_Date: 2001
    Currentness_Reference: ground condition

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

    Geospatial_Data_Presentation_Form: map, 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: 0.999600
      Longitude_of_Central_Meridian: -141
      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 0.000001
      Ordinates (y-coordinates) are specified to the nearest 0.000001
      Planar coordinates are specified in meters

      The horizontal datum used is North American Datum of 1927.
      The ellipsoid used is North American Datum of 1927.
      The semi-major axis of the ellipsoid used is 6378206.4.
      The flattening of the ellipsoid used is 1/294.9786982.

  7. How does the data set describe geographic features?

    pir2002-1d-border
    outline shape of the study area (Source: Alaska Division of Geological & Geophysical Surveys)

    pir2002-1d-contact
    engineering-geologic unit outlines (Source: Alaska Division of Geological & Geophysical Surveys)

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

    ValueDefinition
    approximately locatedapproximately located unit contact

    pir2002-1d-materials
    engineering-geologic units (Source: Alaska Division of Geological & Geophysical Surveys)

    MAT
    engineering-geologic unit type (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    BCMedium-jointed, fine- to coarse-grained sedimentary carbonate rocks and their metamorphic equivalents. Includes limestone and marble.
    BGCoarse-jointed, coarse-grained igneous lithologies and their metamorphic equivalents. Chiefly granitic rocks. Includes coarse-grained gneiss.
    BMMedium-jointed, fine- to medium-grained quartzose sedimentary rocks and their metamorphic equivalents. Chiefly quartzite in this map area.
    BORocks of lithologies that are (a) not listed in other materials classes, but which may be suited for use as construction materials or for other specialized purposes, and (b) mixed units composed of combinations of the above bedrock materials classes. Includes fine-grained gneiss and phyllite.
    BSFine- to coarse-grained mafic plutonic rocks and their metamorphic equivalents. Includes metagabbro and serpentinite.
    BURocks of mixed lithology and/or very fine-grained sedimentary lithologies that are generally poorly suited for use as construction materials. Includes coal-bearing Tertiary sediments.
    BVMedium-jointed, fine-grained igneous rocks and their metamorphic equivalents. Chiefly metavolcanics and dikes.
    GMPoorly- to moderately well-sorted clay, silt, sand, gravel, and diamicton of colluvial, fluvial, and glacial origins. Includes angular, unsorted talus debris and chaotically deformed colluvium derived from landslides. Engineering applications vary widely due to large range of grain size and sorting properties. Commonly frozen. Estimated 20 to 80 percent coarse, granular deposits with considerable oversized material. Includes primarily GC and GM of the Unified Soil Classification System (Wagner, 1957).
    GSFluvial and glaciofluvial gravel, sand, and silt. Chiefly (estimated >80 percent) clean sand and gravel. Grain size, sorting, and degree of stratification are variable. Permafrost may be present, especially in older deposits. Older deposits may contain highly weathered clasts and thus may not be suitable as construction materials. Rare oversized materials may include boulders. Includes primarily GP and GW of the Unified Soil Classification System (Wagner, 1957).
    OROrganic-rich silt and peat in bogs, former stream channels, and lake basins. Commonly frozen and ice-rich due to the excellent insulating properties of peat. Generally water-saturated. Chiefly organic materials. Estimated >50 percent peat, organic sand, or organic silt. Includes Pt of the Unified Soil Classification System (Wagner, 1957).
    SMSilt deposited primarily by wind and reworked by fluvial and colluvial processes. May be organic rich. Commonly frozen and ice-rich, especially on north-facing slopes. Chiefly fine materials. Estimated >80 percent silt, sand, and clay. Includes primarily ML, MH, and SM of the Unified Soil Classification System (Wagner, 1957).

    pir2002-1d-photolinear
    linear features visible on aerial photographs (Source: Alaska Division of Geological & Geophysical Surveys)

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

    ValueDefinition
    photolinear featurelinear feature visible on aerial photographs

    pir2002-1d-pingo
    pingo locations (Source: Alaska Division of Geological & Geophysical Surveys)

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

    ValueDefinition
    pingopingo location


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 project is part of the Alaska Airborne Geophysical/Geological Mineral Inventory Program funded by the Alaska State Legislature and managed by State of Alaska, Department of Natural Resources (DNR), Division of Geological & Geophysical Surveys (DGGS). Partial funding for the geologic mapping was also provided by the U.S. Geological Survey, National Cooperative Geologic Mapping Program, under STATEMAP Award No. 01HQAG0054.

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

    Alaska Division of Geological & Geophysical Surveys
    c/o James Weakland
    GIS Analyst III
    3354 College Rd
    Fairbanks, AK 99709-3707
    USA

    907-451-5029 (voice)
    dggsgis@alaska.gov

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


Why was the data set created?

This project, resulting map, geospatial data was intended to provide a geologic map and a geologic interpretation of the Fortymile mining district at 1:63,360 scale. Previous published 1:63,360 scale geologic maps of this area were reconnaissance-level maps or only covered portions of the quadrangle. Mapping at 1:63,360 scale (or more detailed) was needed to identify critical geologic features that may relate to more regional structures or geologic units.


How was the data set created?

  1. From what previous works were the data drawn?

    Wagner, A.A., 1957 (source 1 of 1)
    Wagner, A.A., 1957, The use of the Unified Soil Classification System by the Bureau of Reclamation:: Proceedings, 4th International Conference on Soil Mechanics and Foundation Engineering vol. I, p. 125., International Conference on Soil Mechanics and Foundation Engineering, London, England.

    Type_of_Source_Media: paper
    Source_Contribution: Soil Classification System

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

    Date: 2001 (process 1 of 2)
    Engineering map compilation- Data from the comprehensive geologic map of the area (Szumigala, D.J., Newberry, R.J., Werdon, M.B., Athey, J.E., Stevens, D.S.P., Flynn, R.L., Clautice, K.H., and Craw, P.A., 2002, Geologic map of the Eagle A-1 Quadrangle, Fortymile mining district: Alaska Division of Geological & Geophysical Surveys Preliminary Interpretive Report 2002-1A, 1 sheet, scale 1:63,360.) were used as the basis for generating the derivative engineering-geologic map. An ArcInfo lookup table was made to assign geologic units (item UNIT) from the comprehensive map to appropriate engineering-geologic units (item MAT) based on the Unified Soil Classification System as described by Wagner, A.A., 1957. This lookup table was applied to the ArcInfo polygon coverage containing the geologic units and a new engineering-geologic polygon coverage was generated using the "dissolve" command based on the new materials-unit item "MAT". ArcPlot was used to generate plot files of the resulting materials coverage using DGGS-standard symbology, and the Arc graphics files were converted into .eps files for export to Adobe Illustrator for final cartographic assembly.

    Data sources used in this process:

    • Wagner, A.A., 1957

    Date: 2012 (process 2 of 2)
    The layout for the printed map was finished in 2012. At the time of publication, DGGS staff converted the originating ArcInfo coverages to shapefiles, compiled FGDC compliant metadata documentation, and assembled the shapefiles into an online data distribution package.

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

    Pinney, D.S., 2001, Engineering-geologic map of the Eagle A-2 Quadrangle, Fortymile mining district, Alaska: Preliminary Interpretive Report PIR 2001-3D, Alaska Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.

    Online Links:

    Other_Citation_Details: 1 sheet, scale 1:63,360
    Pinney, D.S., 2001, Surficial-geologic map of the Eagle A-2 Quadrangle, Fortymile mining district, Alaska: Preliminary Interpretive Report PIR 2001-3C, Alaska Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.

    Online Links:

    Other_Citation_Details: 1 sheet, scale 1:63,360
    Stevens, D.S.P., and Burns, P.A.C., 2010, Surficial-geologic map of the Eagle A-1 Quadrangle, Fortymile mining district: Preliminary Interpretive Report PIR 2002-1C, Alaska Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.

    Online Links:

    Other_Citation_Details: 1 sheet, scale 1:63,360
    Szumigala, D.J., Newberry, R.J., Werdon, M.B., Athey, J.E., Flynn, R.L., and Clautice, K.H., 2002, Bedrock geologic map of the Eagle A-1 Quadrangle, Fortymile mining district: Preliminary Interpretive Report PIR 2002-1B, Alaska Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.

    Online Links:

    Other_Citation_Details: 1 sheet, scale 1:63,360
    Szumigala, D.J., Newberry, R.J., Werdon, M.B., Athey, J.E., Stevens, D.S.P., Flynn, R.L., Clautice, K.H., and Craw, P.A., 2002, Geologic map of the Eagle A-1 Quadrangle, Fortymile mining district: Preliminary Interpretive Report PIR 2002-1A, Alaska Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.

    Online Links:

    Other_Citation_Details: 1 sheet, scale 1:63,360
    Szumigala, D.J., Newberry, R.J., Werdon, M.B., Finseth, B.A., and Pinney, D.S., 2000, Preliminary bedrock geologic map of a portion of the Fortymile mining district, Alaska: Preliminary Interpretive Report PIR 2000-6, Alaska Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.

    Online Links:

    Other_Citation_Details: 1 sheet, scale 1:63,360
    Werdon, M.B., Newberry, R.J., Szumigala, D.J., and Pinney, D.S., 2001, Geologic map of the Eagle A-2 Quadrangle, Fortymile mining district, Alaska: Preliminary Interpretive Report PIR 2001-3A, Alaska Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.

    Online Links:

    Other_Citation_Details: 1 sheet, scale 1:63,360
    Werdon, M.B., Newberry, R.J., and Szumigala, D.J., 2001, Bedrock geologic map of the Eagle A-2 Quadrangle, Fortymile mining district, Alaska: Preliminary Interpretive Report PIR 2001-3B, Alaska 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?

    Certainty in identification of the map units varies due to the scale and interpretive nature of the mapping. The geologic unit interpretations and boundaries presented in this report result from interpretation of nominal 1:65,000-scale aerial photographs, investigative traverses throughout the map area, aerial reconnaissance via helicopter, and examination of road-cuts and river exposures. Engineering-geologic map units were derived from the surficial-geologic map (PIR 2002-3C). Physical properties of engineering-geologic map units are interpretive, based on extrapolation from verified localities and from previously published reports and data. This map has received two technical reviews by scientists familiar with the subject matter. We incorporated the reviewer's suggestions into the final draft.

  2. How accurate are the geographic locations?

    Surficial mappers recorded observations on 1:65,000-scale (nominal) color-infrared aerial photographs and 1:63,360 scale topographic base maps. We believe the total horizontal accuracy of the mapped surficial-geologic contacts is on the order of 25 m or better, with somewhat lesser accuracy expected in areas of rugged relief.

  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 about the mapped and interpreted engineering-geologic deposits in the map area distinguishable at a scale of 1:63,360. No analytical tests were conducted for this report. The table describes engineering properties that are generally present in the mapped surficial deposits, but local variations and exceptions are most certainly to be expected. The reader is therefore cautioned that this map is intended only as a general guide, and that unevaluated geologic resources and hazards may be present. Detailed geotechnical investigations should be conducted prior to utilization of any map units for engineering purposes.

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

    Polygon topology was present and clean on the original Arc GIS coverages. All polygon features were topologically validated using ArcGIS prior to export to shapefile format.


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)

    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?

    PIR 2002-1D

  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 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: 05-Nov-2012
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 Nov 15 12:21:35 2012