Derivative Map of the Geologic Materials and Hazards in the Eastern Half McGrath Quadrangle, Alaska

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Frequently-anticipated questions:


What does this data set describe?

Title:
Derivative Map of the Geologic Materials and Hazards in the Eastern Half McGrath Quadrangle, Alaska
Abstract:
This map illustrates the potential near-surface sources of various geologic materials that may be useful for construction. Field observations indicate that each geologic unit has a definite composition or range of composition wherever that unit is found. Therefore, the 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. The map also addresses some of the principle geologic hazards that may be associated with the deposits based upon their general physical properties and conditions that are characteristic of their depositional environment.
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." Basic unit information is also included in the geologic unit code set file "RI1997-14_codeset.pdf." Layers include:
mcgmat_arc    materials units (arc)
mcgmat_poly    materials units (polygon)
faultzone_arc    indicates location of the Denali-Farewell fault system (arc)
faultzone_poly    indicates location of the Denali-Farewell fault system (polygon)
  1. How should this data set be cited?

    Kline, J.T., and Pinney, D.S., 1997, Derivative Map of the Geologic Materials and Hazards in the Eastern Half McGrath Quadrangle, Alaska: Report of Investigations RI 97-14B, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.

    Online Links:

    Other_Citation_Details: 1 sheet, scale 1:125,000

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -154.551058
    East_Bounding_Coordinate: -152.999998
    North_Bounding_Coordinate: 63.007954
    South_Bounding_Coordinate: 61.991851

  3. What does it look like?

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

    Beginning_Date: 01-Jul-1980
    Ending_Date: 30-Jun-1997
    Currentness_Reference: 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: 5N
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: 0.999600
      Longitude_of_Central_Meridian: -153.000
      Latitude_of_Projection_Origin: 0.0
      False_Easting: 500000
      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 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?

    mcgmat_arc.shp
    Object type is vector, there are 5396 rows associated with this entity, and the entity values refer to material units contacts. (Source: Alaska Division of Geological & Geophysical Surveys)

    mcggmat_poly.shp
    Object type is vector, there are 2208 rows associated with this entity, and the entity values refer to the material units name abbreviations for each specific polygon represented on the map. (Source: Alaska Division of Geological & Geophysical Surveys)

    MAT
    A unique three letter abbreviation given to each materials unit represented on the map. Materials units imply a hazards classification. (Source: Alaska Division of Geological and Geophysical Surveys)

    Formal codeset
    Codeset Name:RI1997-14_codeset.pdf
    Codeset Source:Alaska Division of Geological & Geophysical Surveys <http://www.dggs.dnr.state.ak.us/metadata/RI1997-14_codeset.pdf>

    faultzone_arc.shp
    Object type is vector, there is 1 row associated with this entity, and the entity value refers to the location of the Denali-Farewell fault system. (Source: Alaska Division of Geological & Geophysical Surveys)

    faultzone_poly.shp
    Object type is vector, there is 1 row associated with this entity, and the entity value refers to the polygon showing the location of the Denali-Farewell fault system. (Source: Alaska Division of Geological & Geophysical Surveys)


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 map synthesis was partially supported by the U.S. Geological Survey's National Mapping Program under cooperative agreement 1434-HQ-96-AG-01471. The views and conclusions contained in this document are those of the authors and should not be interpreted as necessarily representing the official policies, either expressed or implied, of the U.S. government. Additional Acknowledgments: Map synthesis and compilation by D.S. Pinney; Technical review by R.A. Combellick and T.K. Bundtzen; Electronic digital cartography by A.M. McCarthy and G.R.C. Graham; Color design by Ann-Lillian Schell; Editing done by Paula K. Davis.

  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.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 purpose of this map is to indicate general areas that deserve consideration for certain materials and to eliminate other general areas from consideration for these materials. Local variations are common, especially near unit boundaries.


How was the data set created?

  1. From what previous works were the data drawn?

    Bundtzen and others, 1997 (source 1 of 4)
    Bundtzen, T.K., Harris, E.E., and Gilbert, W.G., 1997, Geologic Map of the Eastern Half of the McGrath Quadrangle, Alaska.: Report of Investigations RI 97-14A, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, Alaska - USA.

    Online Links:

    Other_Citation_Details: 34 pp., 1 sheet, scale 1:125,000
    Type_of_Source_Media: paper map and report
    Source_Scale_Denominator: 125000
    Source_Contribution: See references cited in reports in RI 1997-14A and RI 1997-14B

    Bundtzen and others, 1987 (source 2 of 4)
    Bundtzen, T.K., Kline, J.T., Smith, T.E., and Albanese, M.D., 1987, Geologic Map of the McGrath A-2 Quadrangle, Alaska: Professional Report 91 PR 91, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.

    Online Links:

    Other_Citation_Details: 20 pp., 1 sheet, scale 1:63,360
    Type_of_Source_Media: paper map
    Source_Scale_Denominator: 63360
    Source_Contribution:
    Unit descriptions, engineering characteristics, and hazards information presented in publication RI 1997-14B are largely based upon the mapping and observations provided in this publication.

    Gilbert and others, 1988 (source 3 of 4)
    Gilbert, W.G., Solie, D.N., and Kline, J.T., 1988, Geologic Map of the McGrath A-3 Quadrangle, Alaska: Professional Report 92 PR 92, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.

    Online Links:

    Other_Citation_Details: 2 sheets, scale 1:63,360
    Type_of_Source_Media: paper map
    Source_Scale_Denominator: 63360
    Source_Contribution:
    Unit descriptions, engineering characteristics, and hazards information presented in publication RI 1997-14B are largely based upon the mapping and observations provided in this publication.

    Kline and others, 1986 (source 4 of 4)
    Kline, J.T., Gilbert, W.G., and Bundtzen, T.K., 1986, Preliminary Geologic Map of the McGrath C-1 Quadrangle, Alaska: Report of Investigations RI 86-25, 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
    Type_of_Source_Media: paper map
    Source_Scale_Denominator: 63360
    Source_Contribution:
    Unit descriptions, engineering characteristics, and hazards information presented in publication RI 1997-14B are largely based upon the mapping and observations provided in this publication.

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

    Date: 1997 (process 1 of 1)
    The coverages included in this project are digitized from a mylar compilation of geologic field maps produced on USGS topo bases of the area. Map unit (polygon) locations and attributes were checked by three reviewers familiar with the dominant geologic rock types and structures and/or the specific geology of the McGrath quadrangle area. Location data were determined visually using topographic maps at scales of 1:63,360 and 1:40,000 scale topographic maps using USGS map bases. Some stations were plotted on 1:63,360 scale Infra-Red and 1:40,000 scale black and white air photos during mapping. Because location information was acquired during the time period 1980-1992, GPS technology was not used to determine locations. Instead, geologic contacts, sample, and station locations were visually hand-plotted onto stable mylar bases from the field maps and in some instances, air photos.

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

    Bundtzen, T.K., Harris, E.E., and Gilbert, W.G., 1997, Geologic Map of the Eastern Half of the McGrath Quadrangle, Alaska.: Report of Investigations RI 97-14A, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, Alaska - USA.

    Online Links:


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

  1. How well have the observations been checked?

    Data for geologic layers was digitized off of a mylar geologic compilation. This compilation was done on a stable mylar of the USGS topographic base for the McGrath Quadrangle, Alaska that was photographically enlarged to 1:125,000. (Topographic base compiled in 1965, revised in 1978, 1980, and 1982.) Geologic data included in the compilation are the field maps and notes from this project as well as data from other sources as noted in the "Sources Cited" section.

  2. How accurate are the geographic locations?

    Location data were determined visually using topographic maps at scales of 1:63,360 and 1:40,000 scale topographic maps using USGS map bases. Some stations were plotted on 1:63,360 scale Infra-Red and 1:40,000 scale black and white air photos during mapping. Because location information was acquired during the time period 1980-1992, GPS technology was not used to determine locations. Instead, geologic contacts, sample, and station locations were visually hand-plotted onto stable mylar bases from the field maps and in some instances, air photos. The lists of samples were visually checked against the lists of analyzed samples returned from the laboratories.

  3. How accurate are the heights or depths?

    Thommen TM altimeters were frequently used and calibrated daily.

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

    This data set includes coverages that contain information about materials units and fault system location.

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

    Polygon topology present and clean on appropriate coverages. Other coverages are line, point, or annotation coverages and do not require topologic relationships. Chain-node topology present.


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 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 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.

  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 97-14B

  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: 06-May-2010
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 16:56:12 2008