Recent sediments of the central California continental shelf (Pigeon Point to Sand Hills Bluffs); Part A. Introduction and grain size data

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Frequently-anticipated questions:

What does this data set describe?

Title:
Recent sediments of the central California continental shelf (Pigeon Point to Sand Hills Bluffs); Part A. Introduction and grain size data
Abstract:
"The following work is part of a continuing study of the sediments and sedimentary processes of the continental shelf of central California done in cooperation between the University of California, Berkeley, and the Coastal Engineering Research Center, U.S. Army Corps of Engineers. ... The area covered by this report extends from Pigeon Point in the north to Sand Hill Point in the south. With the completion of this report a complete section of the continental shelf of California from Russian River to Monterey Bay will have been studied. The methods of sediment analysis employed in the overall study are grain size analysis followed by heavy mineral analysis and interpretation."
Supplemental_Information:
This work was supported by Contract 72-67-C-0015 with the Coastal Engineering Research Center, Corps of Engineers, U.S. Army. Data digitized by the USGS for inclusion into usSEABED (<http://walrus.wr.usgs.gov/usseabed>)
  1. How should this data set be cited?

    Lee, J., Yancey, T.E., and Wilde, P., 1970, Recent sediments of the central California continental shelf (Pigeon Point to Sand Hills Bluffs); Part A. Introduction and grain size data: Hydraulic Engineering Laboratory Technical Report HEL-2-28, University of California, Berkeley, CA.

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -122.502
    East_Bounding_Coordinate: -122.195
    North_Bounding_Coordinate: 37.455
    South_Bounding_Coordinate: 36.920

  3. What does it look like?

    HEL2-28 (.jpg)
    Sample distribution with bathymetry and coastline for reference

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

    Calendar_Date: 1969
    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):

      • Point (55)

    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 0.00167. Longitudes are given to the nearest 0.00167. Latitude and longitude values are specified in Decimal degrees.

  7. How does the data set describe geographic features?

    Point
    SDTS point (Source: Source report)

    Depth
    Water depth (Source: Source report)

    Range of values
    Minimum:0
    Maximum:91.6
    Units:Meters
    Resolution:0.1

    Sample description
    Lithologic description (Source: Source report)

    Written sample description including color

    Median
    Median grainsize (Source: Source report)

    Range of values
    Minimum:-0.2
    Maximum:5.12
    Units:Phi
    Resolution:0.01

    Standard deviation
    Inclusive graphic standard deviation (sorting) (Source: Folk, 1965)

    Range of values
    Minimum:1.12
    Maximum:2.14
    Units:Phi
    Resolution:0.01

    Skewness
    Graphic inclusive skewness (Source: Folk, 1965)

    Range of values
    Minimum:0.59
    Maximum:2.307
    Units:Unitless
    Resolution:0.001

    Kurtosis
    Folk graphic kurtosis (Source: Folk, 1965)

    Range of values
    Minimum:0.33
    Maximum:0.8
    Units:Unitless
    Resolution:0.01

    Q1
    Quartile value of sand fraction at 25 percent (Source: Trask 1932)

    Range of values
    Minimum:-0.7
    Maximum:4.5
    Units:Phi
    Resolution:0.1

    Q3
    Quartile value of sand fraction at 75 percent (Source: Trask 1932)

    Range of values
    Minimum:0.1
    Maximum:6.0
    Units:Phi
    Resolution:0.1

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?

    Digitization: J. Lee, T. E. Yancey, P. Wilde at the University of California Berkeley for the collection and analysis of data. For inclusion into usSEABED: Digitization: Jennifer Mendonca (USGS); Formatting corrections: Jane Reid (USGS) and Chris Jenkins (University of Colorado)

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

    University of California
    Department of Civil and Environmental Engineering
    Berkeley, CA 94720-1710

    510-642-3261 (voice)

Why was the data set created?

No specific purpose was cited in the 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: 1969 (process 1 of 1)
    Marine bottom samples were obtained with an orange peel grab sampler from the converted fishing boat San Michele; marine samples were obtained from the shoreline to 300 feet below sea level. Intertidal beach samples were obtained using a pipe coring device, inserted into the beach at approximately mid to low tide level., obtaining upper six to ten inches of sediment. In the laboratory, the samples were analyzed at half phi intervals through the entire range of sediment size spread. The finer grained samples was supplemented by pipette analysis. ... was made at half phi intervals and carried to a lower limit of 8.5 phi.

    Person who carried out this activity:

    University of California
    Department of Civil and Environmental Engineering
    Berkeley, CA 94720-1710

    510-642-3261 (voice)

    Data sources produced in this process:
    • HEL-2-28

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

    Lee, J., Yancey, T., Glogoczowski, M., and Wilde, P., 1971, Recent sediments of the Central California continental shelf (Pigeon Point to Sand Hills Bluffs): Part B. Mineralogical data: Hydraulic Engineering Laboratory Technical Report HEL-2-31, University of California, Berkeley, CA.

    Other_Citation_Details:
    Graphical representation of heavy mineral analyses of beach samples; not included in usSEABED.

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 Decca radar bearings on shore landmarks. Latitude/longitudes are given to degrees tenths minutes.

  3. How accurate are the heights or depths?

    Water depths by echo sounder with a Raytheon depth finder. Depths recorded in fathoms, feet, and meters.

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

    All data were digitized, except graphical cumulative and class grainsize values.

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

    Data fall within normal ranges for phi-size classes and statistical values.

How can someone get a copy of the data set?

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

Access_Constraints: Available at some libraries.
Use_Constraints:
Cite J. Lee, T. Yancey, P. Wilde and the University of California, Berkeley as the source of the information

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

    University of California
    Department of Civil and Environmental Engineering
    Berkeley, CA 94720-1710

    510-642-3261 (voice)

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

    HEL Report 2-28

  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?

    None

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 Tue May 16 21:28:48 2006