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Surficial geologic map along the Castle Mountain fault between Houston and Hatcher Pass Road, Alaska

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

Frequently anticipated questions:


What does this data set describe?

Title:
Surficial geologic map along the Castle Mountain fault between Houston and Hatcher Pass Road, Alaska
Abstract:
This two coverage dataset makes up a 1:25,000 scale surficial geologic map along the Castle Mountain fault between Houston and Hatcher Pass Road in southcentral Alaska. The map area lies entirely within the Anchorage quadrangle and within the Matanuska-Susitna Borough. The primary purpose of the map is to delineate the location of the Castle Mountain fault and other active or potentially active faults in the area. This map lies between two other maps along the Castle Mountain fault by Detterman and others (1974, 1976).
  1. How should this data set be cited?

    Peter Haeussler, U.S. Geological Survey, 1998, Surficial geologic map along the Castle Mountain fault between Houston and Hatcher Pass Road, Alaska: U.S. Geological Survey Open-File Report 98-480, U.S. Geological Survey, Anchorage, Alaska.

    Online Links:

    Other_Citation_Details: 1 map sheet, scale 1:25,000

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -149.9
    East_Bounding_Coordinate: -149.2
    North_Bounding_Coordinate: 61.75
    South_Bounding_Coordinate: 61.5

  3. What does it look like?

    cmfmaplowres.gif (GIF)
    GIF89a image of published map; 300x362 pixels, 72dpi, 256 colors, 44K

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

    Calendar_Date: 1998
    Currentness_Reference: publication date

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

    Geospatial_Data_Presentation_Form: map

  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: 6
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: 0.9996
      Longitude_of_Central_Meridian: -147.0
      Latitude_of_Projection_Origin: 0.0
      False_Easting: 500000
      False_Northing: 0.0

      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 20
      Ordinates (y-coordinates) are specified to the nearest 20
      Planar coordinates are specified in meters

  7. How does the data set describe geographic features?

    Entity_and_Attribute_Overview:
    'Unit' is a numeric item in the polgon attribute table for coverages east and west. The attributes have the following descriptions:
    1 	Qp	Peat deposits (Holocene)
    2 	Qg	Basal drift of Elemendorf advance (Pleistocene)
    3 	Qac	Abandoned river channel deposits (Holocene or Pleistocene)
    4 	Qc	Undifferentiated colluvium (Holocene)
    5 	Qgb	Thin drift of Elmendorf advance (Pleistocene)
    6 	Qad	Ancient drainage deposits of Elmendorf advance (Pleistocene)
    7 	Qat	Alluvium in river terraces (Holocene or Pleistocene)
    8 	Qaa	Alluvium along rivers (Holocene)
    9 	Qml	Lateral moraine of Elmendorf advance (Pleistocene)
    10	Qas	Undifferentiated colluvium and alluvium (Holocene)
    11	Qk	Kame terrace deposits of Elmendorf advance (Pleistocene)
    12	Qg2	Drift of pre-Elmendorf advances (Pleistocene)
    13	Qat2	Alluvium in paleodrainage (Holocene or Pleistocene)
    15	Qam	Alluvium along small meandering streams (Holocene)
    16	Qls	Landslide deposits (Holocene)
    17	Qe	Esker deposits of Elmendorf advance (Pleistocene)
    99	w	water
    
    The arc attribute tables for the coverages east and west have a numeric item named 'code', which has the following descriptions:
    0 	leader
    1 	contact
    2 	contact
    3 	contact, approximately located
    9 	water boundary
    
    The arc attribute tables for coverages fault_e and fault_2 have a numeric item named 'code', which has the following descriptions:
    1 	fault
    2 	fault, possible location
    3 	fault, approximate location
    4 	fault, concealed
    5 	fault, probable location
    6 	limit of aerial photograph coverage
    7 	lineation, probably reflecting bedding in underlying bedrock
    
    Entity_and_Attribute_Detail_Citation:
    For complete description of attributes, see
    Haeussler, P.J., 1998, Surficial geologic map along the Castle Mountain fault between Houston and Hatcher Pass Road, Alaska: U.S. Geological Survey Open-File Report 98-480.


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?

    Peter Haeussler, Nathan Pannkuk (Raytheon STX contractor), H. Wilmer (ECO contractor); U.S. Geological Survey, 4200 University Drive, Anchorage, AK 99508-4667

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

    Peter Haeussler
    U.S. Geological Survey
    4200 University Drive
    Anchorage, AK 99508-4667
    USA

    907-561-1181 (voice)
    907-786-7401 (FAX)
    pheuslr@usgs.gov


Why was the data set created?

This map was designed to delineate the location of the Castle Mountain fault and other active or potentially active faults in the area. Nonetheless, the surficial geologic map may be used for generic purposes.


How was the data set created?

  1. From what previous works were the data drawn?

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

    Date: 1998 (process 1 of 2)
    Linework was captured by hand digitizing from paper maps and mylar overlays. The linework was edited and attributed using ARC/INFO. The coverage was cleaned, built for polygons, and had labels created and attributed. For the purpose of distribution, the coverages have been converted to interchange format files using the ARC/Info export command.

    Date: 28-Oct-1998 (process 2 of 2)
    Creation of original metadata record

    Person who carried out this activity:

    Nora Shew
    US Geological Survey Minerals Resource Program - Alaska Section
    4200 University Drive
    Anchorage, AK 99508-4667
    USA

    907-786-7445 (voice)
    907-786-7401 (FAX)
    nshew@usgs.gov

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


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

  1. How well have the observations been checked?

    The linework was digitized from a paper copy of 1:25,000 scale field maps. The linework was derived from field work and aerial photograpic interpretation. The aerial photographs were taken on March 29, 1986 and working copies were printed at a scale of 1" to 1500 feet or 1:18,000. Aerial photo interpretations were drawn on mylar overlays and then transferered to 1:25,000 topographic maps.
    Geologic contacts are generally accurate to within 30 meters, and most fault locations are accurate to 10 meters, except the Lost-in-the-woods fault, which is located to approximately 100 meters, where dashed and dotted.
    The topographic base is a raster layer and obtained by scanning the culture separation of the 1:25,000 topographic base at 300 dpi.

  2. How accurate are the geographic locations?

    Users of this digital geologic map should respect the intentions of the originators and the limitations of the map. This coverage is intended to be used at a scale of 1:25,000; it is not intended to be used as a more detailed scale. The geologic contacts are generally accurate to within 30 meters, and most fault locations are accurate to 10 meters except the Lost-in-the woods fault, which is located to approximately 100 meters.

  3. How accurate are the heights or depths?

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

    The data sets contain information appropriate for a 1:25,000 scale surficial geologic map.

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

    The map area is covered by two sets of coverages, 'east' and 'west'. Each area has a net coverage containing information about the geologic units ('unit') and their boundaries ("code"). For each area there is an additional coverage containing fault information. Dangling arcs are present.


How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?

Access_Constraints: None
Use_Constraints:
Acknowledgement of the U.S. Geological Survey would be appreciated in products derived from these data.

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

    USGS Information Services
    Box 25286
    Denver Federal Center
    Denver, CO 80225-0046
    USA

    1-888-ASK-USGS (voice)
    303-202-4693 (FAX)

  2. What's the catalog number I need to order this data set?

  3. What legal disclaimers am I supposed to read?

    This digital publication was prepared by an agency of the United States Government. Neither the United States Government nor the agency thereof nor any of their employees make any warranty, expressed or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed in this report or represents that its use would not infringe privately owned rights. Reference therein to any specific commercial product, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof.
    Although this data has been used by the USGS, no warranty, expressed or implied, is made by the USGS as to the accuracy of the data and related materials and/or the functioning of the software. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of these data, software, or related materials.

  4. How can I download or order the data?


Who wrote the metadata?

Dates:
Last modified: 31-Jul-2014
Metadata author:
Peter N Schweitzer
USGS Midwest Area
Geologist
Mail Stop 954
12201 Sunrise Valley Dr
Reston, VA 20192-0002
USA

703-648-6533 (voice)
703-648-6252 (FAX)
pschweitzer@usgs.gov

Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)


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