Geologic aspects of the recent sediments of south San Francisco Bay

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Frequently-anticipated questions:

What does this data set describe?

Title:
Geologic aspects of the recent sediments of south San Francisco 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?

    Conomos, Tasso John , 1963, Geologic aspects of the recent sediments of south San Francisco 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: 37.3294

  3. What does it look like?

    Conomos_MS_1963 (.jpg)
    Sample distribution with coastline and bathymetry for reference.

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

    Beginning_Date: 1961
    Ending_Date: 1963
    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 (60)

    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 .0001. Longitudes are given to the nearest .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 station at MLLW (Source: Source report)

    Range of values
    Minimum:0
    Maximum:14.3
    Units:Meters
    Resolution:0.1

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

    Range of values
    Minimum:1.7
    Maximum:940
    Units:Micron
    Resolution:0.01

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

    Range of values
    Minimum:1.05
    Maximum:10
    Units:Phi
    Resolution:0.01

    Skewness
    Skewness of grainsize distribution (Source: Trask 1932)

    Range of values
    Minimum:0.07
    Maximum:3.41
    Units:Unitless
    Resolution:0.01

    Water content
    Water content of wet sample (Source: Source report)

    Range of values
    Minimum:18.8
    Maximum:69.3
    Units:Percent
    Resolution:0.1

    Color
    Color of sediment (Source: GSA color code)

    Alpha numeric code based on hue, value, and chroma

    pH sediments
    pH of the sediments (Source: Source report)

    Range of values
    Minimum:6.05
    Maximum:8.75
    Units:pH
    Resolution:0.01

    Acid soluble matter
    Acid soluble matter (Source: Source report)

    Range of values
    Minimum:14.7
    Maximum:70.6
    Units:Percent
    Resolution:0.1

    Shell fragments by weight
    Shell fragments by weight (Source: Source report)

    Range of values
    Minimum:2.4
    Maximum:50
    Units:Percent
    Resolution:0.1

    Organic carbon
    Organic carbon (Source: Source report)

    Range of values
    Minimum:0.202
    Maximum:2.450
    Units:Percent
    Resolution:0.001

    Organic matter content
    Organic matter content (Source: Source report)

    Range of values
    Minimum:0.34
    Maximum:4.17
    Units:Percent
    Resolution:0.01

    Heavy minerals in sand sized fraction
    Heavy minerals in sand sized fraction (Source: Source report)

    Range of values
    Minimum:2.8
    Maximum:38.1
    Units:Percent
    Resolution:0.1

    Light minerals in sand-sized fraction
    Light minerals in sand-sized fraction (Source: Source report)

    Percentages of quartz, K-feldspar, plagioclase, composite grains, rock fragments

    Clay-sized fraction
    Clay minerals in clay-size fraction (Source: Source report)

    Percentages of montmorillonite, chlorite, illite in the clay fraction

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?

    T. John Conomos for collecting and analyzing the data. 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?

" This report summarizes the results of research dealing with the first sedment of a comprehensive study of the hydrography, sedimentation, mineralogy and microorganisms of the San Francisco Bay system. The present study covers the area in the San Francisco Bay south of the San Mateo highway bridge, and is concerned with (1) the physical and chemical characteristics of the recent marine sediments as well as the effect of various hydrographic agents upon these sediments; (2) the mineralogy of the sand- and clay-size sediments; (3) the rate of deposition and transportation patterns of the sediments."

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)
    Sand fraction analyzed by Emery settling tube (Emery, 1938), and fine fractions (silt and clay) by standard pipette method (Rittenhouse, 1933). Sodium hydroxide was used as a dispersing agent.

    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
    • Rittenhouse, 1933

    Data sources produced in this process:

    • Conomos_MS_63

  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?

    Locations, where possible, were established at navigational aids such as buoys and pilings. In the absence of navigational aids, methods of dead reckoning and triangulation with a Brunton pocket transit were used. Digitization for inclusion in usSEABED was performed by georeferencing figure 2 in ArcGIS 8.3 using known digital coastline.

  3. How accurate are the heights or depths?

    Water depths technique not noted in report.

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

    Appendix C (Physical data of the sediments), D (Chemical data of the sediments), and E (Mineralogical data, sand fraction) were completely digitized.

  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:
None. Thesis is available at the USGS Library and other libraries.
Use_Constraints:
Cite T. John Conomos 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?

    Conomos 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?

  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?

    Conomos MS thesis 1963

  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 20:39:10 2006