Anthropogenic metals and other elements from core 721-1 obtained in 2002 off San Francisquito Creek in South San Francisco Bay

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Frequently anticipated questions:

What does this data set describe?

Title:
Anthropogenic metals and other elements from core 721-1 obtained in 2002 off San Francisquito Creek in South San Francisco Bay
Abstract:
This data release provides the measurement of anthropogenic metals and other elements in sediments of a core obtained off San Francisquito Creek in South San Francisco Bay.
Supplemental_Information:
Additional information about the field activity from which these data were derived is available online at: https://cmgds.marine.usgs.gov/fan_info.php?fan=2002-603-DD Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
  1. How might this data set be cited?
    McGann, Mary, Phillips, R. Lawrence, and Kneeshaw, Tara A., 20230828, Anthropogenic metals and other elements from core 721-1 obtained in 2002 off San Francisquito Creek in South San Francisco Bay: data release DOI: 10.5066/P9QQT6KZ, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, California.

    Online Links:

    This is part of the following larger work.

    McGann, Mary, Starratt, Scott W., Reidy, Liam M., Lorenson, Thomas D., Phillips, R. Lawrence, and Kneeshaw, Tara A., 2023, Radiocarbon measurements, census counts of benthic foraminifera, diatoms, and palynomorphs, and geochemistry from core 721-1 obtained in 2002 off San Francisquito Creek in South San Francisco Bay: data release DOI:10.5066/P9QQT6KZ, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, CA.

    Online Links:

    Other_Citation_Details:
    Suggested Citation: McGann, M., Starratt, S.W., Reidy, L., Lorenson, T.D., Phillips, R.L., and Kneeshaw, T.A., 2023, Radiocarbon measurements, census counts of benthic foraminifera, diatoms, and palynomorphs, and geochemistry from core 721-1 obtained in 2002 off San Francisquito Creek in South San Francisco Bay: U.S. Geological Survey data release, https://doi.org/10.5066/P9QQT6KZ.
  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -122.0961
    East_Bounding_Coordinate: -122.0961
    North_Bounding_Coordinate: 37.4583
    South_Bounding_Coordinate: 37.4583
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 2002
    Ending_Date: 2023
    Currentness_Reference:
    Ground condition at time data were collected.
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: comma-delimited text
  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):
      • Point (23)
    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 0.0001. Longitudes are given to the nearest 0.0001. Latitude and longitude values are specified in Decimal degrees. The horizontal datum used is North American Datum of 1927.
      The ellipsoid used is Clarke 1866.
      The semi-major axis of the ellipsoid used is 6378206.4.
      The flattening of the ellipsoid used is 1/294.978698214.
  7. How does the data set describe geographic features?
    A comma-separated values file with the first line being a header line.
    Results of metal content of fine sediment. (Source: Producer defined.)
    Date_Collected
    Date in year. (Source: Producer defined.)
    Range of values
    Minimum:2002
    Maximum:2002
    Latitude
    Latitude of the site at which the push core was collected. (Source: Producer defined.)
    Range of values
    Minimum:37.4583
    Maximum:37.4583
    Units:decimal degrees
    Resolution:0.0001
    Longitude
    Longitude of the site at which the push core was collected. (Source: Producer defined.)
    Range of values
    Minimum:-122.0961
    Maximum:-122.0961
    Units:decimal degrees
    Resolution:0.0001
    Sample_Upper_Depth_Limit_cm
    The upper depth at which the sediment sample was obtained below the sediment surface in a core. (Source: Producer defined.)
    Range of values
    Minimum:0.0
    Maximum:167.5
    Units:centimeters
    Resolution:0.1
    Sample_Lower_Depth_Limit_cm
    The lower depth at which the sediment sample was obtained below the sediment surface in a core. (Source: Producer defined.)
    Range of values
    Minimum:0.0
    Maximum:168.5
    Units:centimeters
    Resolution:0.1
    Antimony_content_ppm
    Antimony content of fine sediment (Source: Producer defined)
    Range of values
    Minimum:0.34
    Maximum:1.02
    Units:parts per million
    Resolution:0.01
    Arsenic_content_ppm
    Arsenic content of fine sediment (Source: Producer defined)
    Range of values
    Minimum:5.5
    Maximum:11.5
    Units:parts per million
    Resolution:0.1
    Barium_content_ppm
    Barium content of fine sediment (Source: Producer defined)
    Range of values
    Minimum:367
    Maximum:429
    Units:parts per million
    Resolution:1
    Beryllium_content_ppm
    Beryllium content of fine sediment (Source: Producer defined)
    Range of values
    Minimum:1.1
    Maximum:1.4
    Units:parts per million
    Resolution:0.1
    Bismuth_content_ppm
    Bismuth content of fine sediment (Source: Producer defined)
    Range of values
    Minimum:0.17
    Maximum:0.53
    Units:parts per million
    Resolution:0.01
    Cadmium_content_ppm
    Cadmium content of fine sediment (Source: Producer defined)
    Range of values
    Minimum:0.09
    Maximum:1.51
    Units:parts per million
    Resolution:0.01
    Cerium_content_ppm
    Cerium content of fine sediment (Source: Producer defined)
    Range of values
    Minimum:33.9
    Maximum:40.3
    Units:parts per million
    Resolution:0.1
    Cesium_content_ppm
    Cesium content of fine sediment (Source: Producer defined)
    Range of values
    Minimum:4.43
    Maximum:6.19
    Units:parts per million
    Resolution:0.01
    Chromium_content_ppm
    Chromium content of fine sediment (Source: Producer defined)
    Range of values
    Minimum:151
    Maximum:323
    Units:parts per million
    Resolution:1
    Cobalt_content_ppm
    Cobalt content of fine sediment (Source: Producer defined)
    Range of values
    Minimum:14.2
    Maximum:17.2
    Units:parts per million
    Resolution:0.1
    Copper_content_ppm
    Copper content of fine sediment (Source: Producer defined)
    Range of values
    Minimum:35.4
    Maximum:69.7
    Units:parts per million
    Resolution:0.1
    Gallium_content_ppm
    Gallium content of fine sediment (Source: Producer defined)
    Range of values
    Minimum:14.7
    Maximum:17.0
    Units:parts per million
    Resolution:0.1
    Germanium_content_ppm
    Germanium content of fine sediment (Source: Producer defined)
    Range of values
    Minimum:0.1
    Maximum:0.2
    Units:parts per million
    Resolution:0.1
    Hafnium_content_ppm
    Hafnium content of fine sediment (Source: Producer defined)
    Range of values
    Minimum:1.29
    Maximum:1.70
    Units:parts per million
    Resolution:0.01
    Indium_content_ppm
    Indium content of fine sediment (Source: Producer defined)
    Range of values
    Minimum:0.05
    Maximum:0.08
    Units:parts per million
    Resolution:0.01
    Lanthanum_content_ppm
    Lanthanum content of fine sediment (Source: Producer defined)
    Range of values
    Minimum:16.0
    Maximum:19.4
    Units:parts per million
    Resolution:0.1
    Lead_content_ppm
    Lead content of fine sediment (Source: Producer defined)
    Range of values
    Minimum:10.4
    Maximum:40.1
    Units:parts per million
    Resolution:0.1
    Lithium_content_ppm
    Lithium content of fine sediment (Source: Producer defined)
    Range of values
    Minimum:50
    Maximum:64
    Units:parts per million
    Resolution:1
    Lutetium_content_ppm
    Lutetium content of fine sediment (Source: Producer defined)
    Range of values
    Minimum:0.19
    Maximum:0.23
    Units:parts per million
    Resolution:0.01
    Manganese_content_ppm
    Manganese content of fine sediment (Source: Producer defined)
    Range of values
    Minimum:447
    Maximum:710
    Units:parts per million
    Resolution:1
    Mercury_content_ppb
    Mercury content of fine sediment (Source: Producer defined)
    Range of values
    Minimum:66
    Maximum:530
    Units:parts per billion
    Resolution:1
    Molybdenum_content_ppm
    Molybdenum content of fine sediment (Source: Producer defined)
    Range of values
    Minimum:1.34
    Maximum:5.16
    Units:parts per million
    Resolution:0.01
    Nickel_content_ppm
    Nickel content of fine sediment (Source: Producer defined)
    Range of values
    Minimum:80.5
    Maximum:98.5
    Units:parts per million
    Resolution:0.1
    Niobium_content_ppm
    Niobium content of fine sediment (Source: Producer defined)
    Range of values
    Minimum:0.6
    Maximum:7.2
    Units:parts per million
    Resolution:0.1
    Phosphorus_content_ppm
    Phosphorus content of fine sediment (Source: Producer defined)
    Range of values
    Minimum:530
    Maximum:1010
    Units:parts per million
    Resolution:1
    Rubidium_content_ppm
    Rubidium content of fine sediment (Source: Producer defined)
    Range of values
    Minimum:71.2
    Maximum:96.5
    Units:parts per million
    Resolution:0.1
    Scandium_content_ppm
    Scandium content of fine sediment (Source: Producer defined)
    Range of values
    Minimum:15.5
    Maximum:18.9
    Units:parts per million
    Resolution:0.1
    Selenium_content_ppm
    Selenium content of fine sediment (Source: Producer defined)
    Range of values
    Minimum:1
    Maximum:1
    Units:parts per million
    Resolution:1
    Silver_content_ppm
    Silver content of fine sediment (Source: Producer defined)
    Range of values
    Minimum:0.01
    Maximum:2.99
    Units:parts per million
    Resolution:0.01
    Strontium_content_ppm
    Strontium content of fine sediment (Source: Producer defined)
    Range of values
    Minimum:112
    Maximum:179
    Units:parts per million
    Resolution:1
    Tantalum_content_ppm
    Tantalum content of fine sediment (Source: Producer defined)
    Range of values
    Minimum:0.42
    Maximum:0.83
    Units:parts per million
    Resolution:0.01
    Tellurium_content_ppm
    Tellurium content of fine sediment (Source: Producer defined)
    Range of values
    Minimum:0.04
    Maximum:0.15
    Units:parts per million
    Resolution:0.01
    Terbium_content_ppm
    Terbium content of fine sediment (Source: Producer defined)
    Range of values
    Minimum:0.53
    Maximum:0.62
    Units:parts per million
    Resolution:0.01
    Thallium_content_ppm
    Thallium content of fine sediment (Source: Producer defined)
    Range of values
    Minimum:0.33
    Maximum:0.53
    Units:parts per million
    Resolution:0.01
    Thorium_content_ppm
    Thorium content of fine sediment (Source: Producer defined)
    Range of values
    Minimum:7.0
    Maximum:10.1
    Units:parts per million
    Resolution:0.1
    Tin_content_ppm
    Tin content of fine sediment (Source: Producer defined)
    Range of values
    Minimum:1.2
    Maximum:7.8
    Units:parts per million
    Resolution:0.1
    Tungsten_content_ppm
    Tungsten content of fine sediment (Source: Producer defined)
    Range of values
    Minimum:0.8
    Maximum:1.1
    Units:parts per million
    Resolution:0.1
    Uranium_content_ppm
    Uranium content of fine sediment (Source: Producer defined)
    Range of values
    Minimum:1.9
    Maximum:3.3
    Units:parts per million
    Resolution:0.1
    Vanadium_content_ppm
    Vanadium content of fine sediment (Source: Producer defined)
    Range of values
    Minimum:123
    Maximum:142
    Units:parts per million
    Resolution:1
    Ytterbium_content_ppb
    Ytterbium content of fine sediment (Source: Producer defined)
    Range of values
    Minimum:1.3
    Maximum:1.7
    Units:parts per billion
    Resolution:0.1
    Yttrium_content_ppm
    Yttrium content of fine sediment (Source: Producer defined)
    Range of values
    Minimum:13.6
    Maximum:15.8
    Units:parts per million
    Resolution:0.1
    Zinc_content_ppm
    Zinc content of fine sediment (Source: Producer defined)
    Range of values
    Minimum:86
    Maximum:133
    Units:parts per million
    Resolution:1
    Zirconium_content_ppm
    Zirconium content of fine sediment (Source: Producer defined)
    Range of values
    Minimum:56.0
    Maximum:67.6
    Units:parts per million
    Resolution:0.1
    Entity_and_Attribute_Overview:
    The first line of the comma-separated values file is a header line.
    Entity_and_Attribute_Detail_Citation: U.S. Geological Survey

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Mary McGann
    • R. Lawrence Phillips
    • Tara A. Kneeshaw
  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

    650-329-4979 (voice)
    pcmsc_data@usgs.gov

Why was the data set created?

The urbanized area of downtown Menlo Park is subject to persistent flooding and sediment deposition by San Francisquito Creek in South San Francisco Bay. To mitigate these events, a suite of cores was collected in 2002 at the mouth of the creek to determine sediment depositional rates on the delta. One of those cores was selected for microbiological (pollen, diatoms, and foraminifera) and geochemical analyses to reconstruct a depositional record over the past two millennia. Based on an abrupt change in lithology and faunal assemblages, an instantaneous vertical displacement and deepening of the depositional environment is evident. Coseismic subsidence associated with large fault ruptures may cause these events. An age model based on the first appearances of non-indigenous biota, radiocarbon dates, radiochemistry, and sediment geochemistry suggests the 1868 rupture of the Hayward Fault may have been the cause.

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: 2002 (process 1 of 2)
    A metal core barrel, approximately 9 cm in diameter, was driven into the mudflat slightly northwest of Hooks Point on informally named "Hooks Island" in South San Francisco Bay near Palo Alto, California in 2002 to recover a sediment core. The precise coring location is not available. The core was brought to the the USGS facility in Menlo Park, California and housed in a core refrigerator.
    Date: 2003 (process 2 of 2)
    Twenty-three sediment samples were measured for the presence of anthropogenic metals and elements every approximately 5 to 10 cm downcore between the surface and 168 cm in core 721-1. The methods used for these measurements are not available.
  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?
    Because the methods used to perform the analyses of the metal content in the sediment are not available, it is not possible to state what formal calibrations tests were conducted.
  2. How accurate are the geographic locations?
    A formal accuracy assessment of the horizontal positional information in the data set has not been conducted. The horizontal position was estimated based on distances from the modern tidal channel listed on a figure provided to the first author in October 2003. The horizontal accuracy cannot be determined.
  3. How accurate are the heights or depths?
  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 metadata for each part of this data release carefully for additional details.
  5. How consistent are the relationships among the observations, including topology?
    Because the methods used to perform the analyses of the metal content in the sediment are not available, it is not possible to state what formal logical accuracy tests were conducted.

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 originators 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? These data are available in a comma-delimited text file (SFC_metals_data.csv) which contains results of the measurement of anthropogenic metals and other elements from core 721-1 obtained in 2002 off San Francisquito Creek in South San Francisco Bay.
  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?
    These data can be viewed with any text editor software.

Who wrote the metadata?

Dates:
Last modified: 28-Aug-2023
Metadata author:
U.S. Geological Survey, Pacific Coastal and Marine Science Center
Attn: PCMSC Science Data Coordinator
2885 Mission Street
Santa Cruz, CA

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/ScienceBase/DR_P9QQT6KZ/SFC_metals_metadata.faq.html>
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