Locations and Descriptions of Gravity, Box, and Push Cores Collected In San Francisco Bay Between January and February, 1990 and 1991

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

Frequently-anticipated questions:


What does this data set describe?

Title:
Locations and Descriptions of Gravity, Box, and Push Cores Collected In San Francisco Bay Between January and February, 1990 and 1991
Abstract:
A project to study San Francisco Bay sediments collected over 300 sediment gravity cores; six push cores, and 3 box cores in San Francisco Bay during the years 1990-91. The purpose of the sampling effort is to establish a database on the Holocene sediment history of the bay. The samples described and mapped are the first effort to catalog and present the data collected. Thus far the cores have been utilized in various cooperative studies with state colleges and universities, and other USGS divisions. These cores serve as a base for ongoing multidisciplinary studies. The sediment studies project has initiated subsequent coring efforts within the bay using refined coring techniques to attain deeper cores.
  1. How should this data set be cited?

    United States Geological Survey, Coastal and Marine Geology (CMG), Rober, 200512, Locations and Descriptions of Gravity, Box, and Push Cores Collected In San Francisco Bay Between January and February, 1990 and 1991.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -122.51767
    East_Bounding_Coordinate: -121.61167
    North_Bounding_Coordinate: 38.19150
    South_Bounding_Coordinate: 37.45950

  3. What does it look like?

    <http://pubs.usgs.gov/of/2005/1453/of1453browse.gif> (GIF)
    map of sample locations

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

    Beginning_Date: 22-Jan-1990
    Ending_Date: 27-Feb-1991
    Currentness_Reference: ground condition

  5. What is the general form of this data set?

  6. How does the data set represent geographic features?

    1. How are geographic features stored in the data set?

    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 0.01. Longitudes are given to the nearest 0.01. Latitude and longitude values are specified in Degrees and decimal minutes.

      Vertical_Coordinate_System_Definition:
      Depth_System_Definition:
      Depth_Datum_Name: Local surface
      Depth_Resolution: 0.01
      Depth_Distance_Units: meters
      Depth_Encoding_Method:
      Explicit depth coordinate included with horizontal coordinates

  7. How does the data set describe geographic features?


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?

    The authors wish to thank those individuals who aided in obtaining the numerous samples or in the processing of the cores and maps. Thanks to Gordon Smith, boat driver, who got us into places we shouldn't have been. Also Greg Gable, Bill Webber, John Chin, Tom Reiss, Nathaniel Plank, Bruce Jaffe, Tom Clifton, Tom Lorenson were involved with the core collection at various times through the project. Armando Burciaga, a Minority Participation in Earth Sciences (MPES) student from UCLA who worked diligently on the cores, conducted a portion of the X-radiography and core description. Dave Britton, a summer volunteer helped with the core descriptions. The preliminary map illustration was done by Kristin Brown. The Marine Technician crew of Hal Williams, Ranson Rideout, and Kevin O'Toole aided in the preparation of the coring equipment. And thanks to the University of Mississippi Mineral Research Institute crew headed by Bob Woolsey, and Walter O'Niell, including Bob Sheldon and Brien Noakes for the use of their equipment and expertise in the push-coring part of the operation.

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

    United States Geological Survey (USGS),
    c/o Roberto J. Anima
    USGS, MailStop 999, 345 Middlefield Road
    Menlo Park, CA 94025-3561

    (650) 329-5212 (voice)
    ranima@usgs.gov


Why was the data set created?

The initial intent of this project was to focus on attaining sediment gravity cores in as many varying depositional environments within the San Francisco Bay and Delta as possible to establish a data base on the Holocene sedimentary history of San Francisco Bay.


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)
    See Open File Report 2005-1453, for full methods description.

  3. What similar or related data should the user be aware of?

    United States Geological Survey, Coastal and Marine Geology (CMG), 200512, USGS Coastal and Marine Geology InfoBank.

    Online Links:


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

  1. How well have the observations been checked?

  2. How accurate are the geographic locations?

    Core locations were obtained through either radar fixes both on land and navigation markers or through Mini-Ranger or Del Norte microwave antenna positions located onshore with distances being recorded onboard the vessel.

  3. How accurate are the heights or depths?

    Depth measurements were obtained using a hull mounted 200 kHz Raytheon DE719 Fathometer.

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

    unspecified

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

    unspecified


How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?

Access_Constraints:
Physical materials are under controlled on-site access.

If available, access to physical samples is described in the "WR CMG Sample Distribution Policy" at: <http://walrus.wr.usgs.gov/infobank/programs/html/main/sample-dist-policy.html>

Use_Constraints:
Please recognize the U.S. Geological Survey (USGS) as the source of this information.

Physical materials are under controlled on-site access.

Some USGS information accessed through this means may be preliminary in nature and presented without the approval of the Director of the USGS. This information is provided with the understanding that it is not guaranteed to be correct or complete and conclusions drawn from such information are the responsibility of the user.

This information is not intended for navigational purposes.

Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.


Who wrote the metadata?

Dates:
Last modified: Dec-2005
Metadata author:
United States Geological Survey (USGS),
c/o Roberto J. Anima
USGS, MailStop 999, 345 Middlefield Road
Menlo Park, CA 94025-3561

(650) 329-5212 (voice)
ranima@usgs.gov

Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)


Generated by mp version 2.8.14 on Fri Jan 06 09:45:52 2006