Location and properties of gravity cores analyzed from samples taken from south San Francisco Bay, California, in 1990 (ssfb_1990.shp)

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Frequently anticipated questions:

What does this data set describe?

Title:
Location and properties of gravity cores analyzed from samples taken from south San Francisco Bay, California, in 1990 (ssfb_1990.shp)
Abstract:
Two sample collection cruises were conducted in 1990 (J-1-90-SF and J-2-90-SF) covering San Francisco Bay. A selection of gravity cores from south San Francisco Bay were split, photographed, and imaged by X-rays. Several cores were subsampled for grain size analyses, radiocarbon dating, and modeled as synthetic cores. Graphic cores were constructed for 51 samples described in the accompanying report. The shapefile ssfb_1990.shp provides information about types of analyses applied to the samples.
Supplemental_Information:
Additional information about the field activities from which this data set was derived are available online at
http://walrus.wr.usgs.gov/infobank/j/j190sf/html/j-1-90-sf.meta.html
http://walrus.wr.usgs.gov/infobank/j/j290sf/html/j-2-90-sf.meta.html
  1. How might this data set be cited?
    Wong, Florence L., 2014, Location and properties of gravity cores analyzed from samples taken from south San Francisco Bay, California, in 1990 (ssfb_1990.shp): U.S. Geological Survey, Coastal and Marine Geology Program, Pacific Coastal and Marine Science Center, Santa Cruz and Menlo Park, CA.

    Online Links:

    This is part of the following larger work.

    Woodrow, Donald L., Fregoso, Theresa A., Wong, Florence L., and Jaffe, Bruce E., 2014, Late Holocene Sedimentary Environments of South San Francisco Bay Illustrated in Gravity Cores: U.S. Geological Survey Open-File Report OFR 2014-1198, U.S. Geological Survey, Reston, VA.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -122.26432
    East_Bounding_Coordinate: -122.04467
    North_Bounding_Coordinate: 37.60749
    South_Bounding_Coordinate: 37.45949
  3. What does it look like?
    https://pubs.usgs.gov/of/2014/1198/downloads/ssfb_1990.jpg (JPEG)
    preview map of gravity core locations
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 1990
    Currentness_Reference: ground condition
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: vector digital data
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
      This is a Point data set. It contains the following vector data types (SDTS terminology):
      • Entity point (51)
    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 0.01975. Longitudes are given to the nearest 0.02479. Latitude and longitude values are specified in Decimal seconds. The horizontal datum used is D_North_American_1983.
      The ellipsoid used is GRS_1980.
      The semi-major axis of the ellipsoid used is 6378137.0.
      The flattening of the ellipsoid used is 1/298.257222101.
  7. How does the data set describe geographic features?
    Attribute Table
    Table containing attribute information associated with the data set. (Source: Producer defined)
    LAT
    latitude (Source: Producer defined)
    Range of values
    Minimum:37.459499
    Maximum:37.607498
    Units:degree
    LON
    longitude (Source: Producer defined)
    Range of values
    Minimum:-122.264328
    Maximum:-122.04467
    activityid
    USGS Coastal and Marine Geology activity identifier (Source: Producer defined)
    ValueDefinition
    j-1-90-sfhttp://walrus.wr.usgs.gov/infobank/j/j190sf/html/j-1-90-sf.meta.html
    j-2-90-sfhttp://walrus.wr.usgs.gov/infobank/j/j290sf/html/j-2-90-sf.meta.html
    sampid0
    field sample identifier (Source: Producer defined) Identification assigned to sample at time of collection
    samp90_
    sample identfiier (Source: Producer defined) Post-collection sample identification number 90-XXX assigned to samples collected from activities J-1-90-SF and J-2-90SF and used as identifier in most analyses conducted on samples (Anima and others, 2005).
    photo
    Core photo (Source: Producer defined) Core photo was taken and is available from http://walrus.wr.usgs.gov/infobank/j/j190sf/html/j-1-90-sf.meta.html or http://walrus.wr.usgs.gov/infobank/j/j290sf/html/j-2-90-sf.meta.html under Samples data
    handwrit
    Handwritten core log (Source: Producer defined) Handwritten core log is available from http://walrus.wr.usgs.gov/infobank/j/j190sf/html/j-1-90-sf.meta.html or http://walrus.wr.usgs.gov/infobank/j/j290sf/html/j-2-90-sf.meta.html under Samples data
    radiograph
    x-radiograph (Source: Producer defined) X-radiograph is available from http://walrus.wr.usgs.gov/infobank/j/j190sf/html/j-1-90-sf.meta.html or http://walrus.wr.usgs.gov/infobank/j/j290sf/html/j-2-90-sf.meta.html under Imagery data
    grnsz
    grain size analysis (Source: Producer defined) Grain size analysis was conducted on samples from cores that have identifiers in this field. Results appear in Appendix 1 of this report.
    radiocarb
    Radiocarbon dating (Source: Producer defined) Radiocarbon dating was conducted on samples from cores that have identifiers in this field. Results appear in tables in this report.
    synthetic
    Synthetic core (Source: Producer defined) A synthetic core was constructed for cores that have identifiers in this field. Results appear in Appendix 2 of this report.
    graphiclog
    Graphic log (Source: Producer defined) Graphic log was constructed for cores that have identifiers in this field. Results appear in Appendix 3 of report.
    Entity_and_Attribute_Overview:
    The entity and attribute information provided here describes the tabular data associated with the data set. Please review the detailed descriptions that are provided (the individual attribute descriptions) for information on the values that appear as fields/table entries of the data set.
    Entity_and_Attribute_Detail_Citation:
    The entity and attribute information was generated by the individual and/or agency identified as the originator of the data set. Please review the rest of the metadata record for additional details and information.

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?
  3. To whom should users address questions about the data?
    U.S. Geological Survey
    Attn: Florence L Wong
    Geologist
    Mail Stop 999, 345 Middlefield Road
    Menlo Park, CA
    US

    650-329-5327 (voice)
    650-329-5299 (FAX)
    fwong@usgs.gov

Why was the data set created?

These data are intended for science researchers, students, policy makers, and the general public. The data can be used with geographic information systems (GIS) software to display geologic and oceanographic information.

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: 2014 (process 1 of 1)
    gravity core metadata supplemented by inventory of analyses.
  3. What similar or related data should the user be aware of?
    Anima, R.J., Clifton, H.E., Reiss, Carol, and Wong, F.L., 2005, Locations and descriptions of gravity, box, and push cores collected in San Francisco Bay between January and February, 1990 and 1991: U.S. Geological Survey Open-File Report.

    Online Links:

    Other_Citation_Details: OF 2005-1453

How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?
    No formal attribute accuracy tests were conducted.
  2. How accurate are the geographic locations?
    Navigation data recorded the sample locations to within 0.00001 degree.
  3. How accurate are the heights or depths?
    A formal accuracy assessment of the vertical positional information in the data set has either not been conducted, or is not applicable.
  4. Where are the gaps in the data? What is missing?
    Data set is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record carefully for additional details.
  5. How consistent are the relationships among the observations, including topology?
    Attributes mean the same thing throughout the data set.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?
Access_Constraints: None. Please see 'Distribution Info' for details.
Use_Constraints:
This information is not intended for navigational purposes.
Read and fully comprehend the metadata prior to data use. Uses of these data should not violate the spatial resolution of the data. Where these data are used in combination with other data of different resolution, the resolution of the combined output will be limited by the lowest resolution of all the data.
Acknowledge the U.S. Geological Survey in products derived from these data. Share data products developed using these data with the U.S. Geological Survey.
This database has been approved for release and publication by the Director of the USGS. Although this database has been subjected to rigorous review and is substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, it is released on condition that neither the USGS nor the United States Government may be held liable for any damages resulting from its authorized or unauthorized use.
Although this Federal Geographic Data Committee-compliant metadata file is intended to document these data in nonproprietary form, as well as in ArcInfo format, this metadata file may include some ArcInfo-specific terminology.
  1. Who distributes the data set? (Distributor 1 of 1)
    U.S. Geological Survey
    Attn: Florence L Wong
    Geologist
    Mail Stop 999, 345 Middlefield Road
    Menlo Park, CA
    US

    650-329-5327 (voice)
    650-329-5299 (FAX)
    fwong@usgs.gov
  2. What's the catalog number I need to order this data set? USGS OF 2014-1198
  3. What legal disclaimers am I supposed to read?
    This information is not intended for navigational purposes.
    This database has been approved for release and publication by the Director of the USGS. Although this database has been subjected to rigorous review and is substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, it is released on condition that neither the USGS nor the United States Government may be held liable for any damages resulting from its authorized or unauthorized use.
    Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof.
  4. How can I download or order the data?

Who wrote the metadata?

Dates:
Last modified: 21-Aug-2014
Metadata author:
Florence L Wong
U.S. Geological Survey
Geologist
Mail Stop 999, 345 Middlefield Road
Menlo Park, CA
US

650-329-5327 (voice)
650-329-5299 (FAX)
fwong@usgs.gov
Metadata standard:
FGDC Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)
Generated by mp version 2.9.31 on Wed May 6 14:05:27 2015