Sedimentation and foraminiferal aspects of the recent sediments of San Pablo Bay

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Frequently-anticipated questions:


What does this data set describe?

Title:
Sedimentation and foraminiferal aspects of the recent sediments of San Pablo Bay
Abstract: No formal abstract is given in the report.
Supplemental_Information:
Data digitized for inclusion into usSEABED. (<http://walrus.wr.usgs.gov/usseabed>)
  1. How should this data set be cited?

    Locke, James Leroy , 1971, Sedimentation and foraminiferal aspects of the recent sediments of San Pablo Bay: San Jose State College (University), San Jose.

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -122.4736
    East_Bounding_Coordinate: -121.9747
    North_Bounding_Coordinate: 38.1410
    South_Bounding_Coordinate: 37.4294

  3. What does it look like?

    Locke_MS_71 (.jpg)
    Sample distribution with coastline and bathymetry for reference.

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

    Beginning_Date: 1968
    Ending_Date: 1970
    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 (63)

    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 0.0001. Longitudes are given to the nearest 0.0001. Latitude and longitude values are specified in Decimal degrees.

  7. How does the data set describe geographic features?

    Point
    SDTS point (Source: Source report)

    Water depth
    Water depth of sample (Source: Source report)

    Range of values
    Minimum:0
    Maximum:22.86
    Units:Meters
    Resolution:0.01

    Median diameter
    Median diameter of sediment sample (Source: Source report)

    Range of values
    Minimum:2.3
    Maximum:430
    Units:Micron
    Resolution:0.01

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

    Range of values
    Minimum:1.1
    Maximum:12.9
    Units:Phi
    Resolution:0.01

    Skewness
    Skewness of grainsize distribution (Source: Trask, 1932)

    Range of values
    Minimum:0.100
    Maximum:2.066
    Units:Unitless
    Resolution:0.001

    Sediment type
    Classification of sediment based on ternary of sand, silt, and clay apices. (Source: Shepard, 1954)

    Written classification


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?

    James Leroy Locke at the San Jose State College for the collection and analysis of data. For inclusion into usSEABED: Digitization: April Villagomez and Jane Reid (USGS); Formatting corrections: Jane Reid (USGS) and Chris Jenkins (University of Colorado)

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

    San Jose State University
    Geology Dept., Duncan Hall
    San Jose, CA 95192-0102

    (408) 924-5050 (voice)
    408) 924-5053 (FAX)

    Hours_of_Service: 7:30 to 11:30 and 12:30 to 16:00


Why was the data set created?

" The objectives of this study include 1) determination of the textural and depositional characteristics of the recent marine sediments, 2) establishment of the distribution of the foraminifera, and 3) relating the distribution of the foraminifera to environmental factors."


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)
    Particle size analyses by Emery settling tube (Emery, 1938) for the coarser than 62 micron fractions (i.e., sand), and standard pipette methods (Krumbein and Pettijohn, 1938) for the finer than 62 micron fractions (i.e., silt and clay). Pipette analyses included pretreatment of samples with hydrogen peroxide to remove organic matter and filtering with porcelain filters to remove soluble salts. Sodium hexametaphosphate was added in known concentrations to further prevent flocculation of the samples.

    Person who carried out this activity:

    San Jose State University
    Geology Dept., Duncan Hall
    San Jose, CA 95192-0102

    (408) 924-5050 (voice)
    408) 924-5053 (FAX)

    Hours_of_Service: 7:30 to 11:30 and 12:30 to 16:00
    Data sources used in this process:
    • Emery, 1938
    • Krumbein and Pettijohn, 1938

    Data sources produced in this process:

    • Locke_MS_71

  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 original data. For inclusion into usSEABED, locations and statistical data were digitized by hand (typed in), visually compared to source and corrected as needed. Where appropriate, data were tested for completeness using MS Excel.

  2. How accurate are the geographic locations?

    Locations determined by sextant and radar positioning, plotted on USC&GS chartsand by using ArcGIS 8.3 (2004) by georeferencing figure 2 to digital coastline.

  3. How accurate are the heights or depths?

    Water depths determined by echo sounders or sounding lines.

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

    No estimate made for the original data. For inclusion into usSEABED, collecting date and depth at MLLW were digitized from Appendix A. Appendix B (Physical data of the sediments) was completely digitized. Appendices C (Percent of living population and live diversity data) D (Percent of total population and totoal species diversity data), and E (Foraminiferal population data) were not digitized.

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

    Data fall within normal ranges for 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. Thesis is available at the USGS Library and other libraries.
Use_Constraints:
Cite J.L. Locke and San Jose State University as originators of the data.

  1. Who distributes the data set? (Distributor 1 of 2)

    San Jose State University
    Geology Dept., Duncan Hall
    San Jose, CA 95192-0102

    (408) 924-5050 (voice)
    408) 924-5053 (FAX)

    Hours_of_Service: 7:30 to 11:30 and 12:30 to 16:00
  2. What's the catalog number I need to order this data set?

    Locke MS Thesis

  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 the limitations of the data due to possible imprecision due to navigational inaccuracies, statistical limitations, 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?

    None


  1. Who distributes the data set? (Distributor 2 of 2)

    U.S. Geological Survey
    345 Middlefield Road
    Menlo Park, CA 94025

    650.329.5026 (voice)
    men_lib@usgs.gov

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

    617(276) L793s

  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 the limitations of the data due to possible imprecision due to navigational inaccuracies, statistical limitations, 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?

    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 21:48:47 2006