Lab Item 400; A summary of sediment size and composition of twelve grabs.

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Frequently-anticipated questions:


What does this data set describe?

Title:
Lab Item 400; A summary of sediment size and composition of twelve grabs.
Abstract: No abstracted information given in report
  1. How should this data set be cited?

    U.S. Naval Oceanographic Office (NavOceanO), Achstetter, Eugene V. , Loomis, P.B., and Ross, Cary M. , 1970, Lab Item 400; A summary of sediment size and composition of twelve grabs.: Laboratory Item 400, U.S. Naval Oceanographic Office, Washington D.C. 20373.

    Online Links:

    Other_Citation_Details:
    Geological Laboratory, Nearshore Surveys Division, Oceanographic Surveys Department; Navy Desteiguer

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -123.42
    East_Bounding_Coordinate: -123.34
    North_Bounding_Coordinate: 37.91
    South_Bounding_Coordinate: 37.89

  3. What does it look like?

    MGG_09625001 (jpg)
    Screen grab view of locations with coastline for reference

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

    Beginning_Date: 1970
    Ending_Date: 1970
    Currentness_Reference: Publication date

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

    Geospatial_Data_Presentation_Form: Digital and 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):

      • Point (12)

    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 0.01667. Longitudes are given to the nearest 0.01667. Latitude and longitude values are specified in Decimal degrees.

  7. How does the data set describe geographic features?

    Point
    SDTS point (Source: Source report)

    Sample number
    Sample number (Source: Source report)

    Alpha numeric number based on project number and core information

    Color
    Wet sediment color determined in the lab (Source: Geological Society of America)

    Color and Munsell color code

    Sediment type
    Sample sediment (Source: Source report)

    Written description of sediment texture

    Remarks
    Remarks (Source: Source report)

    Additional comments about sample

    Grainsize percents
    Percent of sample in defined grainsize (phi_ parameters (Source: Source report)

    Range of values
    Minimum:< -5
    Maximum:> 10
    Units:Percent
    Resolution:0.001

    Gravel
    Amount of gravel in sample (Source: Source report)

    Range of values
    Minimum:0
    Maximum:5.236
    Units:Percent of gravel
    Resolution:0.001

    Sand
    Amount of sand in sample (Source: Source report)

    Range of values
    Minimum:82.062
    Maximum:94.45
    Units:Percent
    Resolution:0.001

    Silt
    Amount of silt in sample (Source: Source report)

    Range of values
    Minimum:0.828
    Maximum:11.78
    Units:Percent
    Resolution:0.001

    Clay
    Amount of clay in sample (Source: Source report)

    Range of values
    Minimum:1.461
    Maximum:5.485
    Units:Percent
    Resolution:0.001

    Mean
    First moment measure of grainsize) (Source: Source report)

    Range of values
    Minimum:0.696
    Maximum:3.735
    Units:Phi
    Resolution:0.001

    Standard deviation
    Second moment measure of grainsize (Source: Source report)

    Range of values
    Minimum:1.498
    Maximum:2.268
    Units:Phi
    Resolution:0.001

    Skewness
    Third moment measure of grainsize (Source: Source report)

    Range of values
    Minimum:-.361
    Maximum:2.050
    Units:Phi
    Resolution:0.001

    Kurtosis
    Fourth moment measure of grainsize (Source: Source report)

    Range of values
    Minimum:4.261
    Maximum:24.545
    Units:Phi
    Resolution:0.001

    Calcium carbonate
    Percent soluble in 2 N HCl (Source: Source report)

    Range of values
    Minimum:0
    Maximum:0
    Units:Percent
    Resolution:0.001

    Organic carbon
    Organic carbon of the total sample as determined using a Leco carbon analyzer (Source: Source report)

    Range of values
    Minimum:0
    Maximum:0
    Units:Percent
    Resolution:0.001


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?

    E.V. Kelly, P.B. Loomis, Cary M. Ross at the United States Naval Oceanographic Office for the collection, analysis and archival of data. For inclusion into usSEABED: digitization and formatting April Villagomez(USGS); Corrections: Jane Reid (USGS) and Chris Jenkins (University of Colorado)

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

    National Geophysical Data Center (NGDC)
    c/o Robin R. Warnken
    E/GC3 325 Broadway
    Boulder, CO 80305-3328

    303-497-6338 (voice)
    Robin.R.Warnken@noaa.gov


Why was the data set created?

No specific purpose noted in report


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: 1973 (process 1 of 1)
    No process information given in report.

    Person who carried out this activity:

    U.S. Naval Oceanographic Office
    Washington, D.C. 20373

    Unknown (voice)

    Data sources produced in this process:
    • LI 400

  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?

    Statistical data was digitized by hand (typed in) at NGDC. For usSEABED, digital data and the scanned reported were downloaded via the web, visually compared to source and corrected. Additional data may have been included from the scanned report, also available online. Where appropriate, data were tested for completeness using MS Excel.

  2. How accurate are the geographic locations?

    Navigational techniques not recorded in report; latitudes and longitudes given in degrees and minutes.

  3. How accurate are the heights or depths?

    Water depth determination technique not noted in report. Water depths are given, subsample depths in centimeters from top of core.

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

    All data available online and in scanned report are included.

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

    Data fall within normal ranges for the given parameters.


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:
Cite U.S. Naval Oceanographic Office and NGDC as originators of the data

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

    National Geophysical Data Center (NGDC)
    c/o Robin R. Warnken
    E/GC3 325 Broadway
    Boulder, CO 80305-3328

    303-497-6338 (voice)
    Robin.R.Warnken@noaa.gov

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

    MGGID 09625001

  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, limitations of the statistical data, and digitizing errors.

  4. How can I download or order the data?

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

    web browser and internet access preferred


Who wrote the metadata?

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

831-427-4727 (voice)
jareid@usgs.gov

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


Generated by mp version 2.8.17 on Wed May 17 12:20:28 2006