Gravity Cores and Box Cores from Suisun Bay, San Pablo Bay, and San Francisco Bay, California

Metadata also available as - [Outline] - [Parseable text] - [XML]

Frequently anticipated questions:

What does this data set describe?

Title:
Gravity Cores and Box Cores from Suisun Bay, San Pablo Bay, and San Francisco Bay, California
Abstract:
This data release contains information on 94 gravity cores and 3 box cores that were collected by the U.S. Geological Survey in the areas of Suisun, San Pablo, and San Francisco Bay, California in 1990 and 2000. PDF files describe the cores that were split for analysis, and another pdf file contains a core-log legend. In addition, a shapefile provides sample collection data.
Supplemental_Information:
Additional information about the field activities from which these data were derived are available online at:
http://cmgds.marine.usgs.gov/fan_info.php?fan=J200SF http://cmgds.marine.usgs.gov/fan_info.php?fan=J290SF
Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
Although this Federal Geographic Data Committee-compliant metadata file is intended to document the dataset in nonproprietary form, as well as in Esri format, this metadata file may include some Esri-specific terminology.
  1. How might this data set be cited?
    Fregoso, Theresa A., Woodrow, Donald L., and Orzech, Kevin, 20240322, Gravity Cores and Box Cores from Suisun Bay, San Pablo Bay, and San Francisco Bay, California: U.S. Geological Survey, Coastal and Marine Geology Program, Pacific Coastal and Marine Science Center, Santa Cruz and Menlo Park, CA.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -122.469833
    East_Bounding_Coordinate: -122.030899
    North_Bounding_Coordinate: 38.085522
    South_Bounding_Coordinate: 37.459499
  3. What does it look like?
    CoreLog_Page_1_Image_0001.png (png)
    Example of handwritten core log
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 1990
    Ending_Date: 2000
    Currentness_Reference:
    ground condition
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: Portable Document Format (PDF), shapefile
  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 (97)
    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 0.00001. Longitudes are given to the nearest 0.00001. Latitude and longitude values are specified in Decimal Degrees. The horizontal datum used is D_WGS_1984.
      The ellipsoid used is WGS_1984.
      The semi-major axis of the ellipsoid used is 6378137.0.
      The flattening of the ellipsoid used is 1/298.257223563.
  7. How does the data set describe geographic features?
    Attribute Table
    Table containing attribute information associated with the dataset. (Source: Producer defined)
    FID
    internal feature number (Source: ESRI) Sequential unique whole numbers that are automatically generated
    Shape
    Feature geometry (Source: ESRI) Coordinates defining the features.
    LON
    longitude (Source: Producer defined)
    Range of values
    Minimum:-122.47000
    Maximum:-122.03100
    Units:degree
    LAT
    latitude (Source: Producer defined)
    Range of values
    Minimum:37.45950
    Maximum:38.08550
    Units:degree
    CTIME
    navigation time (Source: Producer defined)
    Range of values
    Minimum:19900200000001
    Maximum:20000872128000
    Units:YYYYDDDHHMMSST, where YYYY is year, DDD is day of the year, HH hour of a 24-hour day, MM minute, SS second, T tenths of seconds
    EQUIPMENT
    coring method (Source: Producer defined)
    ValueDefinition
    gravitycoreType of core
    boxcoreType of core
    DEPTH
    water depth with -9999 representing no value (Source: Producer defined)
    Range of values
    Minimum:2.00
    Maximum:29.00
    Units:meters
    Resolution:0.01
    SAMP_ID
    field sample identifier (Source: Producer defined) sample identifier assigned at the time of data collection
    CORE_ID
    core sample identifier (Source: Producer defined) identifier by which samples are identified when core log is generated.
    COMMENT
    sample collection notes (Source: Producer defined) Notes taken during collection
    YEAR
    year of sample collection (Source: Producer defined)
    Range of values
    Minimum:1990
    Maximum:2000
    Units:year
    survey
    Recorded survey name (Source: Producer defined)
    ValueDefinition
    j_1_90_sfSurvey designation
    j_2_00_sfSurvey designation
    j_2_90_sfSurvey designation
    Entity_and_Attribute_Overview:
    The entity and attribute information provided here describes the tabular data associated with the dataset. 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 dataset.
    Entity_and_Attribute_Detail_Citation:
    The entity and attribute information was generated by the individual and/or agency identified as the originator of the dataset. 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)
    • Theresa A. Fregoso
    • Donald L. Woodrow
    • Kevin Orzech
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
    U.S. Geological Survey, Pacific Coastal and Marine Science Center
    Attn: PCMSC Science Data Coordinator
    2885 Mission Street
    Santa Cruz, CA
    US

    831-427-4747 (voice)
    pcmsc_data@usgs.gov

Why was the data set created?

The examination of these cores was a continuation of analysis of 72 gravity cores from the same field surveys published in Woodrow and others in 2017 and adds to the analysis of cores collected in San Francisco Bay by Anima and others 2005. 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: 2023 (process 1 of 1)
    Locations of gravity cores and box cores not yet released were extracted from survey datasets, combined, and exported to a shapefile.
  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 2005-1453.

    Online Links:

    Woodrow, Donald L., Chin, John L., Wong, Florence L., Fregoso, Theresa A., and Jaffe, Bruce E., 2017, Description of gravity cores from San Pablo Bay and Carquinez Strait, San Francisco Bay, California: U.S. Geological Survey Open-File Report 2017-1078.

    Online Links:

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 dataset has either not been conducted or is not applicable.
  4. Where are the gaps in the data? What is missing?
    Dataset 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 dataset.

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 USGS-authored or produced data and information are in the public domain from the U.S. Government and are freely redistributable with proper metadata and source attribution. Please recognize and acknowledge the U.S. Geological Survey as the originator(s) of the dataset and in products derived from these data. This information is not intended for navigational purposes.
  1. Who distributes the data set? (Distributor 1 of 1)
    U.S. Geological Survey - CMGDS
    2885 Mission Street
    Santa Cruz, CA

    831-427-4747 (voice)
    pcmsc_data@usgs.gov
  2. What's the catalog number I need to order this data set? The downloadable data includes pdf files for 97 cores and a file (00_core_log_key.pdf) that contains a core-log legend, a shapefile (SFBayCores1990_2000.shp and associated files) that provides sample collection data, and FGDC CSDGM-compliant metadata (SFBayCores1990_2000_metadata.xml).
  3. What legal disclaimers am I supposed to read?
    Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty.
  4. How can I download or order the data?
    • Availability in digital form:
      Data format: This zip file contains the shapefile and associated files in format Shapefile Size: 0.0121
      Network links: https://doi.org/10.5066/P9G7VZZQ
      Data format: This zip file contains pdf scans of the gravity and box core logs and a pdf scan of the core-log legend in format portable document format Size: 354.6
      Network links: https://doi.org/10.5066/P9G7VZZQ
    • Cost to order the data: None.

  5. What hardware or software do I need in order to use the data set?
    The PDF files can be viewed with Acrobat Reader or similar software. The shapefile can be viewed with common geographic information applications such as ArcGIS.

Who wrote the metadata?

Dates:
Last modified: 22-Mar-2024
Metadata author:
U.S. Geological Survey, Pacific Coastal and Marine Science Center
Attn: PCMSC Science Data Coordinator
2885 Mission Street
Santa Cruz, CA
US

831-427-4747 (voice)
pcmsc_data@usgs.gov
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)
This page is <https://cmgds.marine.usgs.gov/catalog/pcmsc/DataReleases/CMGDS_DR_tool/DR_P9G7VZZQ/SFBayCores1990_2000_Metadata.faq.html>
Generated by mp version 2.9.51 on Fri Mar 29 12:17:37 2024