Geologic map of the Big Delta A-4 Quadrangle, Alaska

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Frequently-anticipated questions:


What does this data set describe?

Title: Geologic map of the Big Delta A-4 Quadrangle, Alaska
Abstract:
This map illustrates extents and types of unconsolidated deposits and bedrock in the Big Delta A-4 Quadrangle, Alaska. This map is based on field observations begun by Péwé in 1949 and by Reger in 1976. Unit characteristics and extents were determined during field visits and by interpreting 1:40,000-scale black-and-white aerial photographs taken in August 1949 and 1:63,360-scale, false-color infrared aerial photographs taken in July 1978, August 1980, and August 1981.
Supplemental_Information:
The layers listed below are present as ArcGIS shape files. 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." Layers include:
bdgeo3_polygon     bedrock geologic unit polygons
samples_point     sample locations
  1. How should this data set be cited?

    Reger, R.D., and Péwé, T.L., 2002, Geologic map of the Big Delta A-4 Quadrangle, Alaska: Report of Investigation RI 2002-2, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, Alaska - USA.

    Online Links:

    Other_Citation_Details: 1 sheet, scale 1:63,360

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -146.008943
    East_Bounding_Coordinate: -145.486467
    North_Bounding_Coordinate: 64.254273
    South_Bounding_Coordinate: 63.995698

  3. What does it look like?

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

    Calendar_Date: 1976
    Currentness_Reference: ground condition

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

    Geospatial_Data_Presentation_Form: 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: -147.000
      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 0.000064
      Ordinates (y-coordinates) are specified to the nearest 0.000064
      Planar coordinates are specified in meters

      The horizontal datum used is D_Clarke_1866.
      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?

    bdgeo3_polygon.shp
    Object type is vector, there are 532 rows associated with this entity, and the entity values refer to bedrock geology (Source: Alaska Division of Geological & Geophysical Surveys)

    UNIT
    The name of geological units on the map as described in the "Description of Map Units" found on printed map (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    QaaACTIVE-FLOODPLAIN ALLUVIUM—Chiefly well-sorted and well-stratified layers and lenses of silt, sand, and polymictic gravel (pebbles and cobbles) comprising river bars subject to frequent inundations by streams
    QaiINACTIVE-FLOODPLAIN ALLUVIUM—Chiefly 10 to 20 ft of overbank silty sand and sandy silt overlying gravelly, polymictic riverbed sand and sandy gravel beneath surfaces subject to stream flooding at least as often as once or twice every century (Mason and Begét, 1991); may include more than one surface;
    QabABANDONED-FLOODPLAIN ALLUVIUM—Chiefly 10 to 20 ft of overbank sandy silt and silty sand overlying sandy, polymictic riverbed gravel beneath surfaces with widespread lowland loess and local sand dunes and subject to stream flooding about once every 500 to 1,000 years;
    QaoUNDIFFERENTIATED GLACIAL AND NONGLACIAL ALLUVIUM—Primarily coarse, polymictic gravel and sand deposited by former proglacial streams of the Delta glaciation and locally covered along courses of nonglacial streams by postglacial alluvium;
    QatSTREAM-TERRACE ALLUVIUM—Chiefly 4 to more than 20 ft of organic sandy silt and silty sand overlying well-sorted, polymictic sand and gravel beneath stream terrace treads no longer subject to inundations by the stream that deposited the alluvium;
    QcfMIXED COLLUVIUM AND ALLUVIAL DEPOSITS—Primarily fan-shaped, massive to poorly stratified fine material mixed with polymictic pebble and cobble gravel laid down by small, ephemeral streams draining glacial and eolian-cover deposits;
    QelLOESS—Silt with up to 15 percent very fine sand carried by winds and deposited as a blanket over the downwind topography
    QerRETRANSPORTED LOESS AND LOWLAND SILT—Chiefly organic silt with variable amounts of sand and lenses of locally derived gravel that are deposited by slope runoff and seasonal streams draining bedrock slopes covered by upland silt;
    QesDUNE SAND—Chiefly fine eolian sand with trace amounts (2 to 16 percent) of silt;
    QgdoTILL AND ASSOCIATED MORAINAL DEPOSITS OF DELTA GLACIATION—Heterogeneous, nonstratified, polymictic pebble–cobble gravel with some sand and silt and few to numerous subangular to subrounded boulders deposited by glacial ice;
    QgfoOUTWASH OF DELTA GLACIATION
    QgfyOUTWASH OF DONNELLY GLACIATION
    QlrDEPOSITS OF ICE-SHOVED RAMPARTS—Chiefly well-sorted and complexly deformed polymictic pebble–cobble gravel with some medium to coarse sand pushed into a system of double 3- to 5-ft-high ridges around the northwestern margin of Quartz Lake by wind-driven;
    QpSWAMP DEPOSIT—Primarily fibrous and locally woody autochthonous peat with organic silt and sand deposited in lowland sites (Kreig and Reger, 1982); up to 8 ft thick; discontinuously to continuously frozen with moderate to high ice content;
    PzsQUARTZITE AND SCHIST—Chiefly quartzite with common quartz–mica schist and lesser feldspathic quartzite; generally garnetiferous, locally actinolitic and gneissic;
    PzpCaAUGEN GNEISS AND BIOTITE GNEISS—Chiefly medium- to coarse-grained, foliated and typically mylonitic augen gneiss with subordinate augen schist and biotite gneiss of amphibolite metamorphic facies in bedrock uplands of southern Yukon–Tanana terrane;
    PzpCgQUARTZ–BIOTITE GNEISS—Medium-grained, well-foliated and banded to massive gneiss interbedded with quartzite in bedrock uplands of the southern Yukon–Tanana terrane;

    samples_point.shp
    Object type is point, there are 3 rows associated with this entity, and the entity values refer to sample locations (Source: Alaska Division of Geological & Geophysical Surveys)

    SAMPLES#
    Sample number assigned by author(s) (Source: Alaska Division of Geological & Geophysical Surveys)

    Value assigned 1, 2, 3


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?

  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?

This publication provides geological information on the Delta Junction and Big Delta area for resource evaluation and geological hazards.


How was the data set created?

  1. From what previous works were the data drawn?

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

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


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


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?

    Report of Investigation 2002-2

  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: 08-Mar-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@alaska.gov

Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays.
Contact_Instructions:
Please contact us through the e-mail address above whenever possible.
Metadata standard:
FGDC Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)


Generated by mp version 2.9.6 on Tue May 06 14:29:39 2008