Geologic map of the Christian quadrangle, Alaska

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Frequently anticipated questions:

What does this data set describe?

Title: Geologic map of the Christian quadrangle, Alaska
This data set represents reconnaissance geologic mapping of the Christian quadrangle, Alaska. It is used to create the mapsheet in USGS OFR 00-192, which shows bedrock and surficial deposits of the 1:250,000 scale Christian quadrangle in northern Alaska.
  1. How might this data set be cited?
    Brosgé, William P., and Reiser, Hans N., 2000, Geologic map of the Christian quadrangle, Alaska: U.S. Geological Survey Open-File Report 00-192.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -147.0
    East_Bounding_Coordinate: -144.0
    North_Bounding_Coordinate: 68.0
    South_Bounding_Coordinate: 67.0
  3. What does it look like? (GIF)
    Image of the map sheet. Does not include pamphlet.
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 2000
    publication date
  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?
      This is a Vector data set.
    2. What coordinate system is used to represent geographic features?
      Grid_Coordinate_System_Name: Universal Transverse Mercator
      UTM_Zone_Number: 6
      Scale_Factor_at_Central_Meridian: 0.9996
      Longitude_of_Central_Meridian: -147
      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 250
      Ordinates (y-coordinates) are specified to the nearest 250
      Planar coordinates are specified in meters
  7. How does the data set describe geographic features?
    Characteristic of the arc features in coverage csgeol are coded in csgeol.aat, the arc attribute table. The .aat consists of the following items: ARC-CODE and LINETYPE (Source: This data set)
    Arc-code is a positive integer value (3 3 I) item in the arc attribute table. Values range from 0 to 99. Arc-code describes the stratigraphic boundary, fault, or other linear feature. The code is described by the item LINETYPE. (Source: this coverage)
    1Stratigraphic or intrusive contact, location certain
    2Stratigraphic or intrusive contact, location approximate
    3Stratigraphic or intrusive contact, location inferred
    7Shoreline or riverbank
    9Boundary of local basal conglomerate
    10Thrust fault, location certain; teeth on right from origin
    11Thrust fault, location approximate; teeth on right from origin
    12Thrust fault, location inferred; teeth on right from origin
    30Fault, sense of displacement uncertain, location certain
    31Fault, sense of displacement uncertain; location approximate
    32Fault, sense of displacement uncertain, location inferred
    51Concealed contact
    52Concealed fault
    53Concealed thrust fault
    99Bounding line of coverage
    Characteristic of the polygon features are coded in the polygon attribute table. Table csgeol.pat includes of the following items: CLASS, UNIT (geologic unit label), and UNITTYPE (geologic unit). (Source: this coverage)
    Class is a positive integer value (4 5 B) item in the polygon attribute table. Values range from 102 to 1170. The table csgeol.lut contains class and the corresponding geologic label. See USGS Open-File Report 00-192 for full descriptions of the geologic units. (Source: USGS Open-File Report 00-192)
    110Qu - Undifferentiated deposits (Quaternary)
    111Qal - Alluvium (Holocene)
    120Qg - Glacial drift undifferentiated (Pleistocene)
    121Qg1 - Dift of Itkillik I glaciation (Middle to Upper Pleistocene)
    122Qg2 - Dift of Itkillik II glaciation (Upper Pleistocene)
    123Qgs - Drift of Sagavanirktok glaciation (Middle(?) Pleistocene)
    125Qt - Terrace deposits (Pleistocene)
    130Jol - Ophiolitic sequence; layered leucogabbro (Middle Jurassic)
    131Jou - Ophiolitic sequence; ultramafic rocks (Middle Jurassic)
    135Kgr - Granite (Cretaceous)
    140Trgw - Graywacke (Middle or Lower Triassic)
    145TrMc - Chert and argillite (Triassic(?) through Mississippian)
    150JMv - Mafic volcanic rocks (Jurassic through Mississippian)
    151JMvr - Rhyolite and dacite (Jurassic through Mississippian)
    152JMg - Greenstone (Jurassic through Mississippian)
    154MzPzs - Shale (Mesozoic or Paleozoic)
    155MzPzg - Greenstone (Triassic or Upper Paleozoic)
    160Dsl - Sandy limestone (Upper Devonian)
    161Dsq - Quartzite and slate (Devonian)
    162Ds - Phyllite (Devonian)
    165Dpm - Phyllite and metamorphosed sandstone (Devonian)
    166Dmw - Metamorphosed wacke (Devonian)
    167Dw - Wacke (Devonian)
    170Dhf - Hunt Fork Shale, shale member (Upper Devonian)
    171Dvt - Volcanic rocks and tuff (Upper Devonian)
    180Dk - Kanayut Conglomerate (Upper Devonian)
    190Dkq - Kanayut Conglomerate, quartzite member (Upper Devonian)
    195Dn - Noatak Sandstone (Upper Devonian)
    197Dg - Greenstone (Devonian and younger?)
    200Dbsg - Beaucoup Formation, siltstone, greenstone and wacke member (Upper and Middle(?) Devonian)
    210Dbl - Beaucoup Formation cherty limestone (Upper and Middle(?) Devonian)
    211Dbls - Beaucoup Formation, limestone and siltstone member (Upper Devonian)
    215DOs - Skajit Limestone (Devonian through Ordovician)
    220Pzs - Quartz-muscovite schist (Lower Paleozoic)
    221Pzbs - Biotite schist (Lower Paleozoic)
    222TrMcs - Chert adn slate (Triassic(?) through Mississippian)
    1170Dhf - Hunt Fork Shale, local basal conglomerate (Upper Devonian)
    Characteristic of point features in coverage cssstruct are coded in csstruct.pat, the point attribute table. The .pat includes the following items: ANGLE, DIP, CODE, and POINTTYPE. (Source: This data set)
    Angle is a positive integer value (3 3 I) item in the point attribute table. Values may range from 0 to 360 degrees. The value is the azimuthal measurement of strike, where North is 0 degrees and values increase clockwise. (Source: this coverage)
    Range of values
    Dip is a positive integer value (3 3 I) in the point attribute table. Values may range from 0 to 90 degrees. (Source: this coverage)
    Range of values
    Code is a positive integer value (3 3 I) item in csstruct.pat. It is a coded value representing the type of structure measured. Item pointtype is a text field which describes the type of measurement. (Source: this coverage)
    20strike and dip of bedding
    21strike and dip of vertical beds
    23horizontal bed
    49strike and direction of dip of beds from distant views or photo-interpretations

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Brosgé, William P.
    • Reiser, Hans N.
  2. Who also contributed to the data set?
    This digital coverage was created by Keith Labay and David Pray, Raytheon STX contractors.
  3. To whom should users address questions about the data?
    U.S. Geological Survey
    Attn: William P. Brosgé
    345 Middlefield Road MS 901
    Menlo Park, CA

    650-329-5741 (voice)

Why was the data set created?

Digital representation of geologic mapping facilitates the presentation and analysis of earth-science data. Digital maps may be displayed at any scale or projection, however the geologic data in this coverage is not intended for use at a scale larger than 1:250,000.

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: 1999 (process 1 of 2)
    This data was hand digitized in ARC/Info from a hand-drawn 1:250,000 scale paper map. The arcs and polygons were attributed. For the purpose of distribution, the coverage has been converted to an interchange format file using the ARC/Info export command. Person who carried out this activity:
    U.S. Geological Survey
    Attn: Nora Shew
    4200 University Drive
    Anchorage, AK

    907-561-1181 (voice)
    Date: 03-Aug-2000 (process 2 of 2)
    Creation of original metadata record Person who carried out this activity:
    U.S. Geological Survey
    Attn: Nora Shew
    4200 University Drive
    Anchorage, AK

    907-561-1181 (voice)
  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 captured by hand digitizing from a hand-drawn 1:250,000 scale paper map. Vector and polygon attributes were obtained from a compilation of field maps and other compilations. The digital data has been visually checked by and the geologic map has undergone technical review.
  2. How accurate are the geographic locations?
    Users of this digital geologic map should respect the intentions of the original mappers and the limitations of the map. This geologic map compilation is intended to be used at a scale of 1:250,000; it is not intended to be used at a more detailed scale.
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
    These coverages were used to create the map portion of the Christian geologic map. Text files, tables, graphics, and topography shown on the map sheet or pamphlet are not included.
  5. How consistent are the relationships among the observations, including topology?
    This geology data set is a network coverage containing arcs and polygons. Each polygon has a coded attribute designating the mapped geologic unit. Faults, stratigraphic contacts, and other linear features are represented as arcs. When a fault is also a stratigraphic contact, only a single arc is present. Dangling arcs may be present (faults, moraines, etc.)
    Coverage csfold is an arc coverage containing fold axes information. Coverage csstruct is a point coverage, with annotation, containing strike and dip information. Coverage csfossil contains the fossil locations.

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: None
  1. Who distributes the data set? (Distributor 1 of 1)
    USGS Information Services
    Box 25286
    Denver Federal Center
    Denver, CO

    303-202-4200 or 1-888-ASK-USGS (voice)
  2. What's the catalog number I need to order this data set? USGS Open-File Report 00-192
  3. What legal disclaimers am I supposed to read?
    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. 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?

Last modified: 23-Feb-2015
Metadata author:
Peter N Schweitzer
USGS Midwest Area
Collection manager, USGS Geoscience Data Clearinghouse,
Mail Stop 954
12201 Sunrise Valley Dr
Reston, VA

703-648-6533 (voice)
703-648-6252 (FAX)
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)

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