Preliminary geologic map of the Van Nuys 7.5' quadrangle, southern California: A digital database

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Frequently anticipated questions:

What does this data set describe?

Title:
Preliminary geologic map of the Van Nuys 7.5' quadrangle, southern California: A digital database
Abstract:
This Open-File report is a digital geologic map database. This digital map database is compiled from previously published sources combined with some new mapping and modifications in nomenclature. The geologic map database delineates map units that are identified by general age and lithology following the stratigraphic nomenclature of the U. S. Geological Survey. For detailed descriptions of the units, their stratigraphic relations, sources of geologic mapping, and data on exploratory wells consult Yerkes (1996), and Yerkes and Showalter (1990). More specific information about the units may be available in the original sources.
  1. How might this data set be cited?
    Yerkes, R. F., 1997, Preliminary geologic map of the Van Nuys 7.5' quadrangle, southern California: A digital database: U.S. Geological Survey Open-File Report 97-165.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -118.50
    East_Bounding_Coordinate: -118.38
    North_Bounding_Coordinate: 34.25
    South_Bounding_Coordinate: 34.13
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 1997
    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. It contains the following vector data types (SDTS terminology):
      • entity point
      • complete chain
      • GT-polygon composed of chains
    2. What coordinate system is used to represent geographic features?
      Grid_Coordinate_System_Name: California state plane coordinate system
      State_Plane_Coordinate_System:
      SPCS_Zone_Identifier: 3426
      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest unknown
      Ordinates (y-coordinates) are specified to the nearest unknown
      Planar coordinates are specified in meters
  7. How does the data set describe geographic features?
    VN-GEOL.PAT
    Geologic map units symbols (no full descriptions found) (Source: OFR-97-165)
    VN-GEOL.AAT
    Linear geologic features (Source: OFR-97-165)
    LTYPE
    Line type (Source: OFR-97-165)
    ValueDefinition
    contact, approx. locatedContact whose position is not precisely located
    contact, certainObserved contact
    fault, approx. locatedFault whose position is not precisely known
    fault, concealedConcealed fault whose position is inferred
    fault, concealed, queriedConcealed fault whose position is questionable
    map boundary, certainBoundary of mapped area
    scratch boundaryLocation of scratch boundary
    scratch boundary, approx. locatedScratch boundary whose position is not exact
    VN-GEOL.PAT
    Geologic map units at specific locations (same attributes as polygon coverage VN-GEOL.PAT) (Source: OFR-97-165)
    VN-STRC.AAT
    fold axes (Source: OFR-97-165)
    LTYPE
    Line type (Source: OFR-97-165)
    ValueDefinition
    f.a., anticline, approx. locatedAnticlinal fold axis whose position is not precisely known
    VN-STRC.PAT
    Strike and dip information of bedding (Source: OFR-97-165)
    PTTYPE
    Point type (Source: OFR-97-165)
    ValueDefinition
    beddingBedding orientation
    DIP
    Dip of bedding (Source: OFR-97-165)
    Range of values
    Minimum:0
    Maximum:77
    Units:degrees
    Resolution:1
    STRIKE
    Strike of bedding (Source: OFR-97-165)
    Range of values
    Minimum:92
    Maximum:325
    Units:degrees
    Resolution:1
    VN-WELLS.PAT
    Exploratory oil wells (Source: OFR-97-165)

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • R. F. Yerkes
  2. Who also contributed to the data set?
    R. H. Campbell, Reston, VA assisted in field interpretations and compilation; P. K. Showalter and C. M. Wentworth supplied critical custom programming; and S. E. Graham updated supporting files for completeness and consistency and prepared this report.
  3. To whom should users address questions about the data?
    Yerkes, Robert F
    USGS-GEO-WRG-NGM
    Mail Stop 975, USGS
    345 Middlefield Road
    Menlo Park, CA
    US

    650-329-4946 (voice)
    ryerkes@usgs.gov

Why was the data set created?

To provide to the public a digital geologic map database of the Van Nuys 7.5' quadrangle, southern California

How was the data set created?

  1. From what previous works were the data drawn?
    Yerkes (1996) (source 1 of 2)
    Yerkes, R.F., 1996, Preliminary geologic map of the Van Nuys 7.5' quadrangle, southern California: U.S. Geological Survey Open-File Report 96-86.

    Type_of_Source_Media: paper
    Source_Contribution:
    For detailed descriptions of the units, their stratigraphic relations, sources of geologic mapping, and data on exploratory wells consult Yerkes (1996), and Yerkes and Showalter (1990).
    Yerkes and Showalter (1990) (source 2 of 2)
    Yerkes, R.F., and Showalter, P.K., 1990, Exploratory wells drilled in the Los Angeles, California 1:100,000 quadrangle, southern California: U.S. Geological Survey Open-File Report 90-627.

    Type_of_Source_Media: paper
    Source_Scale_Denominator: 100000
    Source_Contribution:
    For detailed descriptions of the units, their stratigraphic relations, sources of geologic mapping, and data on exploratory wells consult Yerkes (1996), and Yerkes and Showalter (1990).
  2. How were the data generated, processed, and modified?
    Date: 1996 (process 1 of 2)
    The geologic map information was digitized from stable originals of the geologic maps at 1:24,000 scale. The author manuscripts (pencil on mylar) were scanned using a monochrome scanner with a resolution of 800 dots per inch. The scanned images were vectorized and transformed from scanner coordinates to projection coordinates with digital tics placed by hand at quadrangle corners. The scanned lines were edited interactively by hand using graphical user interface ALACARTE (Fitzgibbon, 1991, Fitzgibbon and Wentworth, 1991, Wentworth and Fitzgibbon, 1991). Scanning artifacts significant for display at a scale of 1:24,000 were corrected.
    The base map layer (vn-topo) was prepared by scanning a scale-stable composite negative image of the Triunfo Pass 7.5 minute topographic map (1972 edition). The negative was scanned using a monochrome scanner with a resolution of 400 dots per inch. The raster scan was converted to a GRID in ARC/INFO. The GRID was then vectorized and reprojected into State Plane Projection using the four corner tics as reference points. The arcs in the base layer have not been attributed.
    Date: 09-Aug-2000 (process 2 of 2)
    Creation of original metadata record Person who carried out this activity:
    Jennifer Lenz
    US Geological Survey
    12201 Surise Valley Drive, Mail Stop 918
    Reston, VA
    USA

    703-648-6974 (voice)
    703-648-6560 (FAX)
    pschweitzer@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?
  2. How accurate are the geographic locations?
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
    Complete
  5. How consistent are the relationships among the observations, including topology?
    This digital map database is compiled from previously published sources combined with some new mapping and modifications in nomenclature. The geologic map database delineates map units that are identified by general age and lithology following the stratigraphic nomenclature of the U. S. Geological Survey. For detailed descriptions of the units, their stratigraphic relations, sources of geologic mapping, and data on exploratory wells consult Yerkes (1996), and Yerkes and Showalter (1990).

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, Colorado
    USA

    1-888-ASK-USGS (voice)
    1-303-202-4695 (FAX)
    infoservices@usgs.gov
  2. What's the catalog number I need to order this data set? US Geological Survey Open-File Report 97-165
  3. What legal disclaimers am I supposed to read?
    This report is preliminary and has not been reviewed for conformity with U. S. Geological Survey editorial standards or with the North American Stratigraphic Code. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U. S. Government.
    This database, identified as "Preliminary Geologic Map of the Van Nuys 7.5' Quadrangle, southern California: A Digital Database," has been approved for release and publication by the Director of the USGS. Although this database has been reviewed and is substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. This database is released on condition that neither the USGS nor the U. S. Government may be held liable for any damages resulting from its use.
  4. How can I download or order the data?
    • Availability in digital form:
      Data format: 
      ARC/INFO export files	Description of coverage

vn-geol.e00            Depositional contacts, faults, and unit labels
vn-strc.e00            Strike and dip information, fold axes
vn-wells.e00           Exploratory oil wells
vn-topo.e00            Topographic base map taken from a scan  of a composite negative of the Van Nuys 7.5 minute quadrangle (contour interval = 20 ft.)
      in format ARCE (version 7.x) Size: 12.6
      Network links: http://pubs.usgs.gov/of/1997/of97-165/vanuys.tar.gz
    • Cost to order the data: none

Who wrote the metadata?

Dates:
Last modified: 05-Feb-2016
Metadata author:
Peter N Schweitzer
USGS Midwest Area
Collection manager, USGS Geoscience Data Clearinghouse, http://geo-nsdi.er.usgs.gov/
Mail Stop 954
12201 Sunrise Valley Dr
Reston, VA
USA

703-648-6533 (voice)
703-648-6252 (FAX)
pschweitzer@usgs.gov
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)
This page is <https://geo-nsdi.er.usgs.gov/metadata/open-file/97-165/metadata.faq.html>
Generated by mp version 2.9.48 on Tue Jul 03 20:06:45 2018