Grain size, bulk density, and organic carbon of sediment cores from San Pablo Bay and Grizzly Bay, California, 2020

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Frequently anticipated questions:

What does this data set describe?

Title:
Grain size, bulk density, and organic carbon of sediment cores from San Pablo Bay and Grizzly Bay, California, 2020
Abstract:
Bed sediment samples were collected in San Pablo Bay and Grizzly Bays on eight days from January through September 2020, to analyze for sediment properties including bulk density, particle size distribution, and percent organic carbon. Sediment samples were collected from a small vessel near pre-established USGS instrument moorings using a Gomex box corer that was subsampled with three push cores (37 mm in diameter) per Gomex core. Six subsamples were collected from the top 5 centimeters (cm) of each push core, a few push cores included the top 8 cm. The top two subsamples were each 0.5 cm thick, and all following subsamples were each 1 cm thick. Push core samples from the first, third, and fifth centimeter depth were analyzed for grain size and percent organic carbon, while all 6 sections were analyzed for bulk density. Data are provided in a comma-delimited values spreadsheet. These data were collected as part of a collaborative project with the USGS California Water Science Center and the USGS Water Mission Area on physical and biological controls on sediment erodibility, funded by the USGS Priority Ecosystems Program for San Francisco Bay and Delta and the USGS Coastal Marine Hazards and Resources Program.
Supplemental_Information:
Information about the data collection field activities can be found at: https://cmgds.marine.usgs.gov/fan_info.php?fan=2020-603-FA https://cmgds.marine.usgs.gov/fan_info.php?fan=2020-630-FA
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?
    McGill, Samantha C., WinklerPrins, Lukas, and Tan, Angela C., 20210915, Grain size, bulk density, and organic carbon of sediment cores from San Pablo Bay and Grizzly Bay, California, 2020: data release doi:10.5066/P9P7I65U, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, California.

    Online Links:

    This is part of the following larger work.

    McGill, Samantha C., Lacy, Jessica R., Joanne C. T. Ferreira, Allen, Rachel M., WinklerPrins, Lukas, Stevens, Andrew W., and Tan, Angela C., 2021, Hydrodynamic and sediment transport data from San Pablo Bay and Grizzly Bay, California, 2020: data release doi:10.5066/P9N88U5G, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, California.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -122.39122
    East_Bounding_Coordinate: -121.04072
    North_Bounding_Coordinate: 38.11671
    South_Bounding_Coordinate: 38.08363
  3. What does it look like?
    https://www.sciencebase.gov/catalog/file/get/60a451d9d34ea221ce45ebe9?name=ERO20_study_area.jpg &allowOpen=true (JPEG)
    Digital elevation model (DEM) of study area showing locations of USGS moorings in San Pablo Bay (PBM) and Grizzly Bay (GBM).
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 22-Jan-2020
    Ending_Date: 23-Sep-2020
    Currentness_Reference:
    ground condition
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: Comma-separated values
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
      Indirect_Spatial_Reference:
      Data were collected in San Pablo Bay and Grizzly Bay, California
      This is a Point data set. It contains the following vector data types (SDTS terminology):
      • Point (543)
    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 1.0E-5. Longitudes are given to the nearest 1.0E-5. Latitude and longitude values are specified in Decimal degrees. The horizontal datum used is World Geodetic System 1984 (WGS84).
      The ellipsoid used is WGS84.
      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?
    ERO20_GS-BD-C.csv
    Table containing attribute information associated with the dataset (Source: Producer defined)
    FAN ID
    U.S. Geological Survey field activity number (FAN). (Source: Producer defined)
    ValueDefinition
    2020-603-FASamples collected during USGS field activity 2020-603-FA. Additional information about this field activity can be found at https://cmgds.marine.usgs.gov/fan_info.php?fan=2020-603-FA
    2020-630-FASamples collected during USGS field activity 2020-603-FA. Additional information about this field activity can be found at https://cmgds.marine.usgs.gov/fan_info.php?fan=2020-630-FA
    Bag ID
    Sample bag identifier (Source: Producer defined) Sequentially numbered unique identifier for sample bags; assigned in the lab.
    Sample ID
    Sample identifier (Source: Producer defined) Unique identifier for samples; assigned in the field.
    Lab ID
    Sample identifier for sediment lab in YY-FFFFF-XX format, where YY is the 2-digit year (for example 20=2020), FFFFF is the 5-digit field-activity-number (FAN) ID code, and XX is a sequential number given to the sample in the lab. "NA" indicates that no value was assigned. (Source: Producer defined) Unique identifier for samples; assigned in the sediment lab.
    Date Collected
    Date in month/day/year format of sample collection. (Source: Producer defined)
    Range of values
    Minimum:01/22/2020
    Maximum:09/23/2020
    Units:Date in month/day/year format
    Time (PDT)
    Time of sample collection, in hours:minutes:seconds format, Pacific Daylight Time (PDT), (Source: Producer defined)
    Range of values
    Minimum:08:48:00
    Maximum:12:16:00
    Units:hours:minutes:seconds format, Pacific Daylight Time (PDT)
    Site
    Code identifying sampling locations. (Source: Producer defined)
    ValueDefinition
    GBMGrizzly Bay mooring
    PBMSan Pablo Bay mooring
    PBM1San Pablo Bay mooring 1
    GBM1Grizzly Bay mooring 1
    Latitude
    Latitude of sample location in decimal degrees, north. (Source: Producer defined)
    Range of values
    Minimum:38.08336
    Maximum:38.11671
    Units:Decimal degrees
    Longitude
    Longitude of sample location in decimal degrees, east. (Source: Producer defined)
    Range of values
    Minimum:-122.39110
    Maximum:-122.04072
    Units:Decimal degrees
    Core Depth (cm)
    The midpoint of the depth into the sediment bed of the sample. (Source: Producer defined)
    Range of values
    Minimum:0.25
    Maximum:5.5
    Units:centimeters
    Processing Notes
    Relevant information regarding the sample during its processing. "NA" indicates that no additional information was noted. (Source: Producer defined) Unique note of relevant information regarding sample
    Wt. percent in -4.00 phi bin or 16 mm bin
    Weight percent of sample with grain diameter greater than -4.00 phi, or 16 mm, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:0
    Units:percentage
    Wt. percent in -3.75 phi bin or 13.5 mm bin
    Weight percent of sample with grain diameter between -4.00 and -3.75 phi, or 13.5 and 16 mm, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:0
    Units:percentage
    Wt. percent in -3.50 phi bin or 11.2 mm bin
    Weight percent of sample with grain diameter between -3.75 and -3.50 phi, or 11.2 and 13.5 mm, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:0
    Units:percentage
    Wt. percent in -3.25 phi bin or 9.51 mm bin
    Weight percent of sample with grain diameter between -3.50 and -3.25 phi, or 9.51 and 11.2 mm, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:0
    Units:percentage
    Wt. percent in -3.00 phi bin or 8 mm bin
    Weight percent of sample with grain diameter between -3.25 and -3.00 phi, or 8 and 9.51 mm, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:0
    Units:percentage
    Wt. percent in -2.75 phi bin or 6.73 mm bin
    Weight percent of sample with grain diameter between -3.00 and -2.75 phi, or 6.73 and 8 mm, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:0
    Units:percentage
    Wt. percent in -2.50 phi bin or 5.66 mm bin
    Weight percent of sample with grain diameter between -2.75 and -2.50 phi, or 5.66 and 6.73 mm, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:0
    Units:percentage
    Wt. percent in -2.25 phi bin or 4.76 mm bin
    Weight percent of sample with grain diameter between -2.50 and -2.25 phi, or 4.76 and 5.66 mm, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:0
    Units:percentage
    Wt. percent in -2.00 phi bin or 4 mm bin
    Weight percent of sample with grain diameter between -2.25 and -2.00 phi, or 4 and 4.76 mm, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:0
    Units:percentage
    Wt. percent in -1.75 phi bin or 3.36 mm bin
    Weight percent of sample with grain diameter between -2.00 and -1.75 phi, or 3.36 and 4 mm, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:0
    Units:percentage
    Wt. percent in -1.50 phi bin or 2.83 mm bin
    Weight percent of sample with grain diameter between -1.75 and -1.50 phi, or 2.83 and 3.36 mm, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:0
    Units:percentage
    Wt. percent in -1.25 phi bin or 2.38 mm bin
    Weight percent of sample with grain diameter between -1.50 and -1.25 phi, or 2.38 and 2.83 mm, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:0
    Units:percentage
    Wt. percent in -1.00 phi bin or 2 mm bin
    Weight percent of sample with grain diameter between -1.25 and -1.00 phi, or 2 and 2.38 mm, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:0
    Units:percentage
    Wt. percent in -0.75 phi bin or 1.68 mm bin
    Weight percent of sample with grain diameter between -1.00 and -0.75 phi, or 1.68 and 2 mm, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:0
    Units:percentage
    Wt. percent in -0.50 phi bin or 1.41 mm bin
    Weight percent of sample with grain diameter between -0.75 and -0.50 phi, or 1.41 and 1.68 mm, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:0.002921
    Units:percentage
    Wt. percent in -0.25 phi bin or 1.19 mm bin
    Weight percent of sample with grain diameter between -0.50 and -0.25 phi, or 1.19 and 1.41 mm, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:0.086746
    Units:percentage
    Wt. percent in 0.00 phi bin or 1 mm bin
    Weight percent of sample with grain diameter between -0.25 and 0.00 phi, or 1 and 1.19 mm, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:0.190493
    Units:percentage
    Wt. percent in 0.25 phi bin or 0.8409 mm bin
    Weight percent of sample with grain diameter between 0.00 and 0.25 phi, or 0.8409 and 1 mm, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:0.427009
    Units:percentage
    Wt. percent in 0.50 phi bin or 0.7071 mm bin
    Weight percent of sample with grain diameter between 0.25 and 0.50 phi, or 0.7071 and 0.8409 mm, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:0.437938
    Units:percentage
    Wt. percent in 0.75 phi bin or 0.5946 mm bin
    Weight percent of sample with grain diameter between 0.50 and 0.75 phi, or 0.5946 and 0.7071 mm, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:0.511334
    Units:percentage
    Wt. percent in 1.00 phi bin or 0.5 mm bin
    Weight percent of sample with grain diameter between 0.75 and 1.00 phi, or 0.5 and 0.5946 mm, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:0.520305
    Units:percentage
    Wt. percent in 1.25 phi bin or 0.4204 mm bin
    Weight percent of sample with grain diameter between 1.00 and 1.25 phi, or 0.4204 and 0.5 mm, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:0.257013
    Units:percentage
    Wt. percent in 1.50 phi bin or 0.3536 mm bin
    Weight percent of sample with grain diameter between 1.25 and 1.50 phi, or 0.3536 and 0.4204 mm, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:0.285271
    Units:percentage
    Wt. percent in 1.75 phi bin or 0.2973 mm bin
    Weight percent of sample with grain diameter between 1.50 and 1.75 phi, or 0.2973 and 0.3536 mm, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:0.143532
    Units:percentage
    Wt. percent in 2.00 phi bin or 0.25 mm bin
    Weight percent of sample with grain diameter between 1.75 and 2.00 phi, or 0.25 and 0.2973 mm, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:0.130733
    Units:percentage
    Wt. percent in 2.25 phi bin or 0.2102 mm bin
    Weight percent of sample with grain diameter between 2.00 and 2.25 phi, or 0.2102 and 0.25 mm, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:0.357539
    Units:percentage
    Wt. percent in 2.50 phi bin or 0.1768 mm bin
    Weight percent of sample with grain diameter between 2.25 and 2.50 phi, or 0.1768 and 0.2102 mm, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:0.00047
    Maximum:0.970201
    Units:percentage
    Wt. percent in 2.75 phi bin or 0.1487 mm bin
    Weight percent of sample with grain diameter between 2.50 and 2.75 phi, or 0.1487 and 0.1768 mm, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:0.024004
    Maximum:1.354404
    Units:percentage
    Wt. percent in 3.00 phi bin or 0.125 mm bin
    Weight percent of sample with grain diameter between 2.75 and 3.00 phi, or 0.125 and 0.1487 mm, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:0.06170
    Maximum:1.208347
    Units:percentage
    Wt. percent in 3.25 phi bin or 0.1051 mm bin
    Weight percent of sample with grain diameter between 3.00 and 3.25 phi, or 0.1051 and 0.125 mm, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:0.045002
    Maximum:1.102551
    Units:percentage
    Wt. percent in 3.50 phi bin or 0.08839 mm bin
    Weight percent of sample with grain diameter between 3.25 and 3.50 phi, or 0.08839 and 0.1051 mm, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:0.042995
    Maximum:1.626485
    Units:percentage
    Wt. percent in 3.75 phi bin or 0.07433 mm bin
    Weight percent of sample with grain diameter between 3.50 and 3.75 phi, or 0.07433 and 0.08839 mm, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:0.11998
    Maximum:2.191053
    Units:percentage
    Wt. percent in 4.00 phi bin or 0.0625 mm bin
    Weight percent of sample with grain diameter between 3.75 and 4.00 phi, or 0.0625 and 0.07433 mm, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:0.219964
    Maximum:2.75824
    Units:percentage
    Wt. percent in 4.25 phi bin or 0.052556 mm bin
    Weight percent of sample with grain diameter between 4.00 and 4.25 phi, or 0.052556 and 0.0625 mm, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:0.439928
    Maximum:3.149584
    Units:percentage
    Wt. percent in 4.50 phi bin or 0.044194 mm bin
    Weight percent of sample with grain diameter between 4.25 and 4.50 phi, or 0.044194 and 0.052556 mm, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:1.049828
    Maximum:4.148409
    Units:percentage
    Wt. percent in 4.75 phi bin or 0.037163 mm bin
    Weight percent of sample with grain diameter between 4.50 and 4.75 phi, or 0.037163 and 0.044194 mm, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:2.119652
    Maximum:4.911693
    Units:percentage
    Wt. percent in 5.00 phi bin or 0.03125 mm bin
    Weight percent of sample with grain diameter between 4.75 and 5.00 phi, or 0.03125 and 0.037163 mm, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:3.290284
    Maximum:5.384749
    Units:percentage
    Wt. percent in 5.25 phi bin or 0.02628 mm bin
    Weight percent of sample with grain diameter between 5.00 and 5.25 phi, or 0.02628 and 0.03125 mm, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:3.661145
    Maximum:5.411212
    Units:percentage
    Wt. percent in 5.50 phi bin or 0.0221 mm bin
    Weight percent of sample with grain diameter between 5.25 and 5.50 phi, or 0.0221 and 0.02628 mm, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:3.593078
    Maximum:5.370107
    Units:percentage
    Wt. percent in 5.75 phi bin or 0.01858 mm bin
    Weight percent of sample with grain diameter between 5.50 and 5.75 phi, or 0.01858 and 0.0221 mm, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:3.379939
    Maximum:5.220104
    Units:percentage
    Wt. percent in 6.00 phi bin or 0.01563 mm bin
    Weight percent of sample with grain diameter between 5.75 and 6.00 phi, or 0.01563 and 0.01858 mm, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:3.38906
    Maximum:5.290291
    Units:percentage
    Wt. percent in 6.25 phi bin or 0.01314 mm bin
    Weight percent of sample with grain diameter between 6.00 and 6.25 phi, or 0.01314 and 0.01563 mm, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:3.706472
    Maximum:5.500302
    Units:percentage
    Wt. percent in 6.50 phi bin or 0.01105 mm bin
    Weight percent of sample with grain diameter between 6.25 and 6.50 phi, or 0.01105 and 0.01314 mm, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:3.89798
    Maximum:5.579992
    Units:percentage
    Wt. percent in 6.75 phi bin or 0.00929 mm bin
    Weight percent of sample with grain diameter between 6.50 and 6.75 phi, or 0.00929 and 0.01105 mm, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:3.925414
    Maximum:5.540478
    Units:percentage
    Wt. percent in 7.00 phi bin or 0.00781 mm bin
    Weight percent of sample with grain diameter between 6.75 and 7.00 phi, or 0.00781 and 0.00929 mm, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:3.924819
    Maximum:5.370463
    Units:percentage
    Wt. percent in 7.25 phi bin or 0.00657 mm bin
    Weight percent of sample with grain diameter between 7.00 and 7.25 phi, or 0.00657 and 0.00781 mm, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:3.809685
    Maximum:5.130442
    Units:percentage
    Wt. percent in 7.50 phi bin or 0.00552 mm bin
    Weight percent of sample with grain diameter between 7.25 and 7.50 phi, or 0.00552 and 0.00657 mm, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:3.721088
    Maximum:4.920424
    Units:percentage
    Wt. percent in 7.75 phi bin or 0.00465 mm bin
    Weight percent of sample with grain diameter between 7.50 and 7.75 phi, or 0.00465 and 0.00552 mm, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:3.524205
    Maximum:4.579248
    Units:percentage
    Wt. percent in 8.00 phi bin or 0.00391 mm bin
    Weight percent of sample with grain diameter between 7.75 and 8.00 phi, or 0.00391 and 0.00465 mm, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:3.323889
    Maximum:4.423117
    Units:percentage
    Wt. percent in 8.25 phi bin or 0.00329 mm bin
    Weight percent of sample with grain diameter between 8.00 and 8.25 phi, or 0.00329 and 0.00391 mm, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:3.096361
    Maximum:4.234606
    Units:percentage
    Wt. percent in 8.50 phi bin or 0.00276 mm bin
    Weight percent of sample with grain diameter between 8.25 and 8.50 phi, or 0.00276 and 0.00329 mm, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:2.799585
    Maximum:3.877561
    Units:percentage
    Wt. percent in 8.75 phi bin or 0.00232 mm bin
    Weight percent of sample with grain diameter between 8.50 and 8.75 phi, or 0.00232 and 0.00276 mm, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:2.591842
    Maximum:3.639612
    Units:percentage
    Wt. percent in 9.00 phi bin or 0.00195 mm bin
    Weight percent of sample with grain diameter between 8.75 and 9.00 phi, or 0.00195 and 0.00232 mm, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:2.413777
    Maximum:3.411625
    Units:percentage
    Wt. percent in 9.25 phi bin or 0.00164 mm bin
    Weight percent of sample with grain diameter between 9.00 and 9.25 phi, or 0.00164 and 0.00195 mm, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:2.265389
    Maximum:3.223313
    Units:percentage
    Wt. percent in 9.50 phi bin or 0.00138 mm bin
    Weight percent of sample with grain diameter between 9.25 and 9.50 phi, or 0.00138 and 0.00164 mm, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:2.136786
    Maximum:3.074644
    Units:percentage
    Wt. percent in 9.75 phi bin or 0.00116 mm bin
    Weight percent of sample with grain diameter between 9.50 and 9.75 phi, or 0.00116 and 0.00138 mm, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:2.047753
    Maximum:2.985451
    Units:percentage
    Wt. percent in 9.99 phi bin or 0.00098 mm bin
    Weight percent of sample with grain diameter between 9.75 and 9.99 phi, or 0.00098 and 0.00116 mm, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:1.859795
    Maximum:2.757387
    Units:percentage
    Wt. percent in 10.25 phi bin or 0.00082 mm bin
    Weight percent of sample with grain diameter between 9.99 and 10.25 phi, or 0.00082 and 0.00098 mm, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:1.780655
    Maximum:2.688029
    Units:percentage
    Wt. percent in 10.50 phi bin or 0.00069 mm bin
    Weight percent of sample with grain diameter between 10.25 and 10.50 phi, or 0.00069 and 0.00082 mm, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:1.483879
    Maximum:2.27148
    Units:percentage
    Wt. percent in 10.75 phi bin or 0.00058 mm bin
    Weight percent of sample with grain diameter between 10.50 and 10.75 phi, or 0.00058 and 0.00069 mm, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:1.196996
    Maximum:1.844998
    Units:percentage
    Wt. percent in 10.99 phi bin or 0.00049 mm bin
    Weight percent of sample with grain diameter between 10.75 and 10.99 phi, or 0.00049 and 0.00058 mm, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:0.830972
    Maximum:1.299447
    Units:percentage
    Wt. percent in 11.25 phi bin or 0.0004 mm bin
    Weight percent of sample with grain diameter between 10.99 and 11.25 phi, or 0.0004 and 0.00049 mm, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:0.474841
    Maximum:0.734046
    Units:percentage
    Wt. percent in 11.48 phi bin or 0.00035 mm bin
    Weight percent of sample with grain diameter between 11.25 and 11.48 phi, or 0.00035 and 0.0004 mm, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:0.108818
    Maximum:0.168627
    Units:percentage
    Wt. percent in 12.02 phi bin or 0.000241 mm bin
    Weight percent of sample with grain diameter between 11.50 and 12.02 phi, or 0.000241 and 0.00035 mm, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:0
    Units:percentage
    Wt. percent in 13.02 phi bin or 0.00012 mm bin
    Weight percent of sample with grain diameter between 12.02 and 13.02 phi, or 0.00012 and 0.000241 mm, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:0
    Units:percentage
    Percent Gravel
    Percent of sample greater than 2 mm, "NA" indicates that no value was calculated. (Source: Producer defined)
    Range of values
    Minimum:0
    Maximum:0
    Units:Percentage
    Percent Sand
    Percent of sample less than 2 mm and greater than 63 microns, "NA" indicates that no value was calculated. (Source: Producer defined)
    Range of values
    Minimum:0.666314
    Maximum:9.162959
    Units:Percentage
    Percent Silt
    Percent of sample less than 63 microns and greater than 4 microns, "NA" indicates that no value was calculated. (Source: Producer defined)
    Range of values
    Minimum:60.28536
    Maximum:70.53468
    Units:Percentage
    Percent Clay
    Percent of sample less than 4 microns, "NA" indicates that no value was calculated. (Source: Producer defined)
    Range of values
    Minimum:25.08745
    Maximum:36.21084
    Units:Percentage
    Percent Mud
    Percent of sample less than 63 microns, "NA" indicates that no value was calculated. (Source: Producer defined)
    Range of values
    Minimum:90.83704
    Maximum:99.33369
    Units:Percentage
    Gravel to Sand Ratio
    ratio of percent gravel in sample to percent sand. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:0
    Units:no unit
    Sand to Silt Ratio
    ratio of percent sand in sample to percent silt. (Source: producer defined)
    Range of values
    Minimum:0.01
    Maximum:0.149
    Units:no unit
    Silt to Clay Ratio
    ratio of percent silt in sample to percent clay. (Source: producer defined)
    Range of values
    Minimum:1.685
    Maximum:2.805
    Units:no unit
    Sand to Clay Ratio
    ratio of percent sand in sample to percent clay. (Source: producer defined)
    Range of values
    Minimum:0.02
    Maximum:0.322
    Units:no unit
    Sand to Mud Ratio
    ratio of percent sand in sample to percent mud. (Source: producer defined)
    Range of values
    Minimum:0.007
    Maximum:0.101
    Units:no unit
    Gravel to Mud Ratio
    ratio of percent gravel in sample to percent mud. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:0
    Units:no unit
    D5 Phi
    Phi size at D5 for sample, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:3.279
    Maximum:4.815
    Units:Phi size
    D10 Phi
    Phi size at D10 for sample, "NA" indicates that no value was calculated. (Source: Producer defined)
    Range of values
    Minimum:4.082
    Maximum:5.155
    Units:Phi size
    D16 Phi
    Phi size at D16 for sample, "NA" indicates that no value was calculated. (Source: Producer defined)
    Range of values
    Minimum:4.542
    Maximum:5.488
    Units:Phi size
    D25 Phi
    Phi size at D25 for sample, "NA" indicates that no value was calculated. (Source: Producer defined)
    Range of values
    Minimum:5.096
    Maximum:5.957
    Units:Phi size
    D50 Phi
    Phi size at D50 for sample, "NA" indicates that no value was calculated. (Source: Producer defined)
    Range of values
    Minimum:6.42
    Maximum:7.243
    Units:Phi size
    D75 Phi
    Phi size at D75 for sample, "NA" indicates that no value was calculated. (Source: Producer defined)
    Range of values
    Minimum:8.006
    Maximum:8.715
    Units:Phi size
    D84 Phi
    Phi size at D84 for sample, "NA" indicates that no value was calculated. (Source: Producer defined)
    Range of values
    Minimum:8.814
    Maximum:9.4
    Units:Phi size
    D90 Phi
    Phi size at D90 for sample, "NA" indicates that no value was calculated. (Source: Producer defined)
    Range of values
    Minimum:9.476
    Maximum:9.907
    Units:Phi size
    D95 Phi
    Phi size at D95 for sample, "NA" indicates that no value was calculated. (Source: Producer defined)
    Range of values
    Minimum:10.121
    Maximum:10.396
    Units:Phi size
    D5 mm
    mm size at D5 for sample, "NA" indicates that no value was calculated. (Source: Producer defined)
    Range of values
    Minimum:0.0007
    Maximum:0.0009
    Units:millimeters
    D10 mm
    mm size at D10 for sample, "NA" indicates that no value was calculated. (Source: Producer defined)
    Range of values
    Minimum:0.001
    Maximum:0.0014
    Units:millimeters
    D16 mm
    mm size at D16 for sample, "NA" indicates that no value was calculated. (Source: Producer defined)
    Range of values
    Minimum:0.0015
    Maximum:0.0022
    Units:millimeters
    D25 mm
    mm size at D25 for sample, "NA" indicates that no value was calculated. (Source: Producer defined)
    Range of values
    Minimum:0.0024
    Maximum:0.0039
    Units:millimeters
    D50 mm
    mm size at D50 for sample, "NA" indicates that no value was calculated. (Source: Producer defined)
    Range of values
    Minimum:0.0066
    Maximum:0.0117
    Units:millimeters
    D75 mm
    mm size at D75 for sample, "NA" indicates that no value was calculated. (Source: Producer defined)
    Range of values
    Minimum:0.0161
    Maximum:0.0292
    Units:millimeters
    D84 mm
    mm size at D84 for sample, "NA" indicates that no value was calculated. (Source: Producer defined)
    Range of values
    Minimum:0.0223
    Maximum:0.0429
    Units:millimeters
    D90 mm
    mm size at D90 for sample, "NA" indicates that no value was calculated. (Source: Producer defined)
    Range of values
    Minimum:0.0281
    Maximum:0.0591
    Units:millimeters
    D95 mm
    mm size at D95 for sample, "NA" indicates that no value was calculated. (Source: Producer defined)
    Range of values
    Minimum:0.0355
    Maximum:0.103
    Units:millimeters
    F-W Median
    Phi size median for sample by Folk and Ward (1957) method, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:6.420187
    Maximum:7.24308
    Units:Phi size
    F-W Mean
    Phi size mean for sample by Folk and Ward (1957) method, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:6.64974
    Maximum:7.288797
    Units:Phi size
    F-W Sorting
    sorting for sample by Folk and Ward (1957) method, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:1.769086
    Maximum:2.160422
    Units:Phi size
    F-W Skewness
    skewness for sample by Folk and Ward (1957) method, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:-0.0076
    Maximum:0.19277
    Units:Phi size
    F-W Kurtosis
    Kurtosis for sample by Folk and Ward (1957) method, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:0.813398
    Maximum:0.930664
    Units:Phi size
    Inman Median
    Phi size median for sample by Inman (1952) method, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:6.420187
    Maximum:7.24308
    Units:Phi size
    Inman Mean
    Phi size mean for sample by Inman (1952) method, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:6.764517
    Maximum:7.362267
    Units:Phi size
    Inman Sorting
    sorting for sample by Inman (1952) method, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:1.873799
    Maximum:2.297132
    Units:Phi size
    Inman Skew 16-84
    skewness for sample (D16-D84) by Inman (1952) method, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:-0.01831
    Maximum:0.17623
    Units:Phi size
    Inman Skew 05-95
    skewness for sample (D5-D95) by Inman (1952) method, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:-0.03982
    Maximum:0.322598
    Units:Phi size
    Inman Kurtosis
    Kurtosis for sample by Inman (1952) method, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:0.424228
    Maximum:0.597806
    Units:Phi size
    Trask Median
    mm size median for sample by Trask (1930) method in mm, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:0.006601
    Maximum:0.011677
    Units:millimeters
    Trask Mean
    mm size mean for sample by Trask (1930) method in mm, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:0.009399
    Maximum:0.016173
    Units:millimeters
    Trask Sorting
    sorting for sample by Trask (1930) method in mm, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:2.440853
    Maximum:3.124794
    Units:millimeters
    Trask Skewness
    skewness for sample by Trask (1930) method in mm, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:0.789138
    Maximum:1.113217
    Units:millimeters
    Trask Kurtosis
    kurtosis for sample by Trask (1930) method in mm, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:0.212462
    Maximum:0.270041
    Units:millimeters
    Mean Phi
    phi size mean for sample, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:6.663778
    Maximum:7.285555
    Units:Phi size
    Mean mm
    mm size mean for sample, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:0.00641
    Maximum:0.009863
    Units:millimeters
    Variance Phi
    variance for sample, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:2.907115
    Maximum:4.66761
    Units:Phi size
    Std. Dev. Phi
    standard deviation for sample, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:1.705026
    Maximum:2.160465
    Units:Phi size
    Skewness Phi
    skewness for sample, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:-0.41391
    Maximum:0.402086
    Units:Phi size
    Kurtosis Phi
    kurtosis for sample, "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:2.094155
    Maximum:3.330154
    Units:Phi size
    Bag Weight (g)
    The weight of the empty sample bag. "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:3.195
    Maximum:3.3806
    Units:grams
    Bag and Wet Sediment Weight (g)
    The weight of the initial wet sample, as it was collected in the sample bag. "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:8.3568
    Maximum:20.8725
    Units:grams
    Bag and Dry Sediment Weight (g)
    The weight of the dry sample including the weight of its sample bag. "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:4.642
    Maximum:11.643
    Units:grams
    Dry Sediment Weight (g)
    The weight of the dried sediment in the sample. "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:1.322
    Maximum:8.395
    Units:grams
    Water Weight (g)
    The weight of the water from the sample. "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:3.546
    Maximum:10.498
    Units:grams
    Bulk Density (g/cm^3)
    The dry bulk density of the sample, calculated as the mass of the dry sediment divided by the volume of the initial sample. "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:1.175061
    Maximum:1.447867
    Units:grams per cubic centimeter
    Percent Total Carbon
    Total weight percentage of organic carbon for sample. "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:1.016
    Maximum:2.568
    Units:percentage
    Percent Total Organic Carbon
    Total weight percentage of total carbon for sample. "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:0.986
    Maximum:2.269
    Units:percentage
    Percent Total Inorganic Carbon
    Total weight percentage of inorganic carbon for sample. "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:0.014
    Maximum:0.485
    Units:percentage
    Percent Calcium Carbonate
    Total weight percentage of calcium carbonate (CaCO3) for sample. "NA" indicates that no value was calculated. (Source: producer defined)
    Range of values
    Minimum:0.1194
    Maximum:4.04
    Units:grams per cubic centimeter

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Samantha C. McGill
    • Lukas WinklerPrins
    • Angela C. Tan
  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

    831-460-4747 (voice)
    pcmsc_data@usgs.gov

Why was the data set created?

These data were collected to investigate temporal variability in physical properties of the sediment bed that may influence erodibility. They were collected as part of a collaborative study with the USGS California Water Science Center and the USGS Water Resource Mission Area investigating physical and biological controls on bed erodibility. These data are intended for researchers, students, policy makers, and the general public.

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: 23-Sep-2020 (process 1 of 4)
    Subsamples were collected from the top 5 centimeters (cm) of push cores collected in San Pablo Bay and Grizzly Bay, California. The top two subsamples were each 0.5 cm thick, and all following subsamples were each 1 cm thick. Subsamples were placed into pre-weighed Whirl-pak bags.
    Date: 25-Sep-2020 (process 2 of 4)
    Wet samples weights were measured, then samples were placed in a 60 degrees C oven until fully dried. Once samples were fully dried, they were placed in a desiccator for an hour, then dry weights were measured. Samples were then placed back in the oven for another 4 hours at 60 degrees C, moved to the desiccator for 1 hour, and reweighed. Samples were considered dry when their weights were equal to or less than 0.004g of their previously recorded dry weight. The bulk density reported here was calculated with the formula: bulk density = (water density * sediment density) / (water density + (sediment density - water density) * water content), where water density is 1 g/cm3 and sediment density is 2.65 g/cm3. Measurements were made in the USGS Pacific Coastal and Marine Science Center sediment lab.
    Date: 29-Jun-2020 (process 3 of 4)
    The grain-size distributions of samples were determined in the USGS Pacific Coastal and Marine Science Center sediment lab. Approximately 20 g of sediment was subsampled and 10 mL of 30 percent hydrogen peroxide was added to remove organic material in the sample. The sample was heated at 250 degrees C to remove any remaining hydrogen peroxide and was placed in an ultrasonic bath to liberate the fine fraction. Subsequently, the sample was centrifuged for 1.5 hours to remove soluble salts. Samples were funneled through a 1-mm and a 63-um sieve to separate the gravel (greater than 1 mm), sand (63 um to 1 mm), and mud (less than 63 um). The sand and gravel fractions were dried in an 80-degree C oven and weighed. Five mL of sodium hexametaphosphate was added to the mud fraction and a 20 mL aliquot was taken from a 1 L graduated cylinder to determine the weight of the mud. The particle-size distribution of the mud and sand fractions was analyzed separately using a Beckman Coulter LS 13 320, and the gravel, sand, and mud results were integrated into a single grain-size distribution for each sample. Where used, phi sizes are equal to the negative log base 1 of millimeter size.
    Date: 25-Sep-2020 (process 4 of 4)
    Percent carbon measurements were made in the USGS Pacific Coastal and Marine Science Center sediment lab. To determine percent carbon in sediment samples, approximately 5g of sample sediment was sub-sampled and dried in an 80 degrees C oven overnight. Samples were then pulverized into a fine powder. To obtain percent total carbon (TC), approximately 20mg of the pulverized sample was weighed and wrapped in an aluminum tin. A UIC CM 5200 furnace attached to a CM 5015 coulometer was used to incinerate the samples at 950 degree C which converted the produced CO2 into a value to obtain total carbon as percent dry weight. For percent total inorganic carbon (TIC), approximately 20mg of sample was weighed into and placed in glass sample tubes which were loaded into a UIC CM 5230 acid digester attached to a CM 5015 coulometer. The samples were digested with 2mL perchloric acid and the produced CO2 was measured to obtain a total inorganic carbon value as percent dry weight. To determine percent calcium carbonate of a sample, the percent TIC value was multiplied by 8.333. The percent total organic carbon (TOC) value was determined by subtracting the percent TIC value from the percent TC value. Two analyses were run per system and the results were averaged.
  3. What similar or related data should the user be aware of?
    Folk, Robert Louis, and Ward, William C., 1957, Brazos River bar; a study in the significance of grain size parameters: Journal article Journal of Sedimentary Research, v. 27, n. 1, p. 3-26, SEPM Society for Sedimentary Geology, Boulder, CO.

    Online Links:

    Inman, Douglas Lamar, 1952, Measures for describing the size distribution of sediments: Journal article Journal of Sedimentary Research, v. 22, n. 3, p. 125-145, SEPM Society for Sedimentary Geology, Boulder, CO.

    Online Links:

    Trask, Parker D., 1930, Mechanical analyses of sediments by centrifuge: Journal article Economic Geology, v. 26, n. 6, p. 581-599, Society of Economic Geologists (SEG), Littleton, CO.

    Online Links:

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

  1. How well have the observations been checked?
    Data values are within the expected values.
  2. How accurate are the geographic locations?
  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 rest of the metadata record carefully for additional details.
  5. How consistent are the relationships among the observations, including topology?
    Data values are within the expected values.

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 (USGS) as the originator 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
    U.S. Geological Survey
    Denver Federal Center, Building 810, Mail Stop 302
    Denver, CO
    United States

    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 csv format (ERO20_GS_BD_C.csv) along with CSDGM FGDC-compliant metadata.
  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 data is available in comma-separated values (CSV) spreadsheet format. Text editing software can be used to open the file, as well as spreadsheet programs, such as Microsoft Excel.

Who wrote the metadata?

Dates:
Last modified: 15-Sep-2021
Metadata author:
PCMSC Science Data Coordinator
U.S. Geological Survey, Pacific Coastal and Marine Science Center
2885 Mission Street
Santa Cruz, CA
United States

831-427-7520 (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_P9N88U5G/ERO20_GS_BD_C_metadata.faq.html>
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