Submarine canyons of southern California, part I: Topography, water, and sediments

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Frequently-anticipated questions:

What does this data set describe?

Submarine canyons of southern California, part I: Topography, water, and sediments
Abstract: No formal abstract exists
Data are included in the Deck41 compilation held at NGDC; samples in that compilation have been decommissioned in usSEABED. Data digitized by the USGS for inclusion into usSEABED (<>)
  1. How should this data set be cited?

    Emery, K.O., and Hülsemann, Jobst, 1963, Submarine canyons of southern California, part I: Topography, water, and sediments: Allan Hancock Pacific Expeditions Volume 27, part 1, University of Southern California Press, Los Angeles, CA.

    Financed in part by National Science Foundation Grants G-9060 and G-12329; in part by Allan Hancock, in part under contract to Hyperion Engineers, Inc.

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -119.932
    East_Bounding_Coordinate: -117.257
    North_Bounding_Coordinate: 34.142
    South_Bounding_Coordinate: 32.380

  3. What does it look like?

    EmeryHulsemann_1963 (.jpg)
    Sample distribution with coastline and bathymetry for reference.

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

    Beginning_Date: 1951
    Ending_Date: 1962
    Currentness_Reference: Publication date

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

    Geospatial_Data_Presentation_Form: Paper

  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 (242 (47 without data))

    2. What coordinate system is used to represent geographic features?

      Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.00028. Longitudes are given to the nearest 0.00028. Latitude and longitude values are specified in Decimal degrees.

  7. How does the data set describe geographic features?

    SDTS point (Source: Source report)

    AHF Sta. #
    Station number (Source: Allan Hancock Foundation)

    Sequential alpha numeric code

    Water depth
    Water depth (Source: Source report)

    Range of values

    Median diameter
    Median diameter of grain size distribution (Source: Source report)

    Range of values

    Gravel (Source: Wentworth 1938)

    Range of values

    Sand (Source: Wentworth 1938)

    Range of values

    Silt (Source: Wentworth 1938)

    Range of values

    Clay (Source: Wentworth 1938)

    Range of values

    Sorting coefficient
    Sorting (standard deviation of grain size distribution) (Source: Trask, 1932)

    Range of values

    Lithologic description
    Sample descriptions (Source: Source report)

    Written text

    Calcium carbonate (Source: Source report)

    Range of values

    Organic C (direct)
    Organic carbon (Source: Source report)

    Range of values

    Nitrogen (Kjeldahl)
    Nitrogen (Source: Kjeldahl)

    Range of values

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?

    K.O. Emery and Jobst Hülsemann at the University of Southern California for the collection and analysis of data. For inclusion into usSEABED: Digitization: Jane Reid (USGS); Formatting corrections: Jane Reid (USGS) and Chris Jenkins (University of Colorado).

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

    University of Southern California
    Zumberge Hall
    Los Angeles, CA 90089

    213-740-6106 (voice)

Why was the data set created?

Not stated

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: Unknown (process 1 of 1)
    Textural analyses by standard pipette procedures for fines (<0.062 mm) and settling tube for coarse fraction (>0.062 mm. Dried and weighed sediment samples were treated with sulfuric acid, heated, and the evolved carbon dioxide was measured volumetrically. From these volumes, the percentages of calcium carbonate were computed on the assumption that all of the carbonate was combined with calcium...Calcium carbonate grains coarse enough to be identified as to source organisms consist dominantly of shell fragments in the coarse sediments and foraminiferal tests in the fine sediments.

    Person who carried out this activity:

    University of Southern California
    Zumberge Hall
    Los Angeles, CA 90089

    213-740-6106 (voice)

    Data sources used in this process:
    • Trask, 1932

    Data sources produced in this process:

    • Emery_&_Hulsemann_1964

  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?

    No estimate made for the accuracy of the data in the original report. Data digitized by the USGS and partners were visually compared to the source data, and corrected. Where appropriate, data were tested for completeness using MS Excel. Locations checked using GIS.

  2. How accurate are the geographic locations?

    Navigation by radar range and bearing. Accuracy not noted in report; fixes were about 1.5 km apart at 9 to 10 knots taken every 5 minutes. Positions given to minutes, seconds.

  3. How accurate are the heights or depths?

    Depths by Precision Depth Recorder attached to an Edo echo sounder; depths uncorrected for sound velocity and are probably about 1.2 percent too shallow.

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

    For usSEABED, appendix A was completely digitized. Some information from the report text is also included in usSEABED.

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

    Data fall within normal ranges for analytical results.

How can someone get a copy of the data set?

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

Access_Constraints: None. Report is available at libraries.
Cite K.O. Emery, Jobst Hulsemann, and the University of Southern California as originators of the data.

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

    University of Southern California
    Zumberge Hall
    Los Angeles, CA 90089

    213-740-6106 (voice)

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

    Allan Hancock Pacific Expeditions, v. 27, part 1

  3. What legal disclaimers am I supposed to read?

    Although this dataset has been used by the USGS, no warranty, expressed or implied, is made by the USGS as to the accuracy of the data. Users of the data should be aware of limitations of the data due to possible imprecision due to navigational inaccuracies and limitations of the statistical data.

  4. How can I download or order the data?

  5. What hardware or software do I need in order to use the data set?


Who wrote the metadata?

Last modified: 2005
Metadata author:
U.S. Geological Survey
c/o Jane A. Reid
400 Natural Bridges Drive
Santa Cruz, CA 95060

831-427-4727 (voice)

Contact_Instructions: email preferred
Metadata standard:
CSDGM Version 2 (FGDC-STD-001-1998)

Generated by mp version 2.8.17 on Tue May 16 20:59:59 2006