Gravity cores from San Pablo Bay and Carquinez Strait, San Francisco Bay, California

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

Frequently anticipated questions:


What does this data set describe?

Title:
Gravity cores from San Pablo Bay and Carquinez Strait, San Francisco Bay, California
Abstract:
This data release contains information on gravity cores that were collected by the U.S. Geological Survey in the area of San Pablo Bay and Carquinez Strait, California in 1990, 1991, and 2000. Ten (10) pdf files describe gravity cores that were split, photographed, and imaged by X-rays, and another pdf file contains a core-log legend. In addition, a shapefile (sanpablo_spls.shp) provides sample collection data. Seventy-two gravity cores were collected by the U.S. Geological Survey in 1990, 1991, and 2000 from San Pablo Bay and Carquinez Strait, California. Gravity cores from San Pablo Bay contain bioturbated laminated silts and sandy clays, whole and broken bivalve shells (mostly mussels), fossil tube structures, and fine plant or wood fragments. Gravity cores from the channel wall of Carquinez Strait east of San Pablo Bay consist of sand and clay layers, whole and broken bivalve shells (less than in San Pablo Bay), trace fossil tubes, and minute fragments of plant material.
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=J191SF 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 data set 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?
    Woodrow, Donald L., Chin, John L., Wong, Florence L., Fregoso, Theresa A., and Jaffe, Bruce E., 2017, Gravity cores from San Pablo Bay and Carquinez Strait, 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: -122.517997742
    East_Bounding_Coordinate: -122.040000916
    North_Bounding_Coordinate: 38.1407012939
    South_Bounding_Coordinate: 37.95470047
  3. What does it look like?
    https://www.sciencebase.gov/catalog/item/imap/5849b74fe4b071492e42db02 (JPEG)
    map of gravity core locations in San Pablo Bay and Carquinez Strait, California
  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: Vector Digital Data Set (Point)
  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 (72)
    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 0.0197567286. Longitudes are given to the nearest 0.0249708098. Latitude and longitude values are specified in Decimal seconds. 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 data set. (Source: Producer defined)
    ACTIVID
    USGS survey activity identifier (Source: Producer defined)
    ValueDefinition
    J191SFUSGS survey J-1-91-SF http://cmgds.marine.usgs.gov/fan_info.php?fan=J191SF
    J200SFUSGS survey J-2-00-SF http://cmgds.marine.usgs.gov/fan_info.php?fan=J200SF
    J290SFUSGS survey J-2-90-SF http://cmgds.marine.usgs.gov/fan_info.php?fan=J290SF
    CORE_ID
    core sample identifier (Source: Producer defined) identifier by which samples are described in this report. 90-xx and 91-xx were assigned after data collection.
    LON
    longitude (Source: Producer defined)
    Range of values
    Minimum:-122.517997742
    Maximum:-122.040000916
    LAT
    latitude (Source: Producer defined)
    Range of values
    Minimum:37.95470047
    Maximum:38.1407012939
    Units:degree
    CTIME
    navigation time (Source: Producer defined) navigation time as 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
    sample collection equipment (Source: Producer defined) Unknown
    DEPTH_M
    water depth (Source: Producer defined) water depth in meters
    SAMP_ID1
    field sample identifier (Source: Producer defined) sample identifier assigned at the time of data collection
    COMMENT
    sample collection notes (Source: Producer defined) Unknown
    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)
    • Donald L. Woodrow
    • John L. Chin
    • Florence L. Wong
    • Theresa A. Fregoso
    • Bruce E. Jaffe
  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 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 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:
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.
  1. Who distributes the data set? (Distributor 1 of 1)
    U.S. Geological Survey - ScienceBase
    Denver Federal Center, Building 810, Mail Stop 302
    Denver, CO

    1-888-275-8747 (voice)
    sciencebase@usgs.gov
  2. What's the catalog number I need to order this data set? Ten (10) pdf files describing gravity cores (90-087_to_90-092.pdf, 90-093_to_90-099.pdf, 90-101_to_90-110.pdf, 90-111_to_90-119.pdf, 90-120_to_90-123.pdf, 91-034_to_91-039.pdf, 91-040_to_91-044.pdf, 91-051_to_91-058.pdf, GC1_to_GC8.pdf, and GC9_to_GC15.pdf) and another pdf file (00_core_log_key.pdf) that contains a core-log legend. In addition, a shapefile (sanpablo_spls.shp and associated files) provides sample collection data, including FGDC CSDGM-compliant metadata (sanpablo_spls.shp.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?
  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-Jun-2017
Metadata author:
Florence L Wong
U.S. Geological Survey, Pacific Coastal and Marine Science Center
Geologist
Mail Stop 999, 345 Middlefield Road
Menlo Park, CA
US

650-329-5327 (voice)
650-329-5299 (FAX)
fwong@usgs.gov
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)

This page is <https://cmgds.marine.usgs.gov/catalog/pcmsc/sf_bay_delta/GravityCores_SanPabloBay_and_CarquinezStrait.faq.html>
Generated by mp version 2.9.49 on Wed Nov 28 12:14:58 2018