Grain-size distributions from San Pablo Bay, California, 2011 to 2012

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Frequently anticipated questions:

What does this data set describe?

Title:
Grain-size distributions from San Pablo Bay, California, 2011 to 2012
Abstract:
Sediment cores were collected from San Pablo Bay, in the Sacramento-San Joaquin Delta in California by the U.S. Geological Survey Pacific Coastal and Marine Science Center (PCMSC) during multiple surveys from 2011 to 2012. The cores were analyzed for grain-size distributions at the PCMSC sediment lab.
Supplemental_Information:
Information about the data collection field activities can be found at: https://cmgds.marine.usgs.gov/fan_info.php?fan=ID111SF https://cmgds.marine.usgs.gov/fan_info.php?fan=ID212SF
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?
    Ferreira, Joanne C.T., Dailey, Evan T., and Lacy, Jessica R., 2019, Grain-size distributions from San Pablo Bay, California, 2011 to 2012: data release DOI:10.5066/F7WD3Z2F, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, California.

    Online Links:

    This is part of the following larger work.

    Ferreira, Joanne C.T., Dailey, Evan T., and Lacy, Jessica R., 2019, Hydrodynamic and sediment transport data from San Pablo Bay (northern San Francisco Bay), 2011-2012: data release DOI:10.5066/F7WD3Z2F, 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: -122.411092
    East_Bounding_Coordinate: -122.361944
    North_Bounding_Coordinate: 38.130778
    South_Bounding_Coordinate: 38.037667
  3. What does it look like?
    https://www.sciencebase.gov/catalog/file/get/5bd75b51e4b0b3fc5ce77857?name=ITX_GrainSize.png&allowOpen=true (PNG)
    Image map showing average values of median grain size (excluding gravel) and ratio of sand, silt, and clay at each sampling location.
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 02-Feb-2011
    Ending_Date: 03-Oct-2017
    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, Sacramento-San Joaquin Delta, California
      This is a Point data set. It contains the following vector data types (SDTS terminology):
      • Point (19)
    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?
    ITX_GrainSize_2011to2012.csv
    Table containing attribute information associated with the dataset (Source: Producer defined)
    FACS/FAN I.D.
    Alphanumeric code designating USGS Field Activity Number (Source: Producer defined)
    ValueDefinition
    I-D1-11-SFUSGS Field Activity Number I-D1-11-SF. For more information about this field activity, go to: https://cmgds.marine.usgs.gov/fan_info.php?fan=ID111SF
    I-D2-12-SFUSGS Field Activity Number I-D2-12-SF. For more information about this field activity, go to: https://cmgds.marine.usgs.gov/fan_info.php?fan=ID212SF
    Sample I.D.
    Sample identifier (Source: Producer defined) Unique identifier for samples; assigned in the field.
    Lab I.D.
    Sample identifier for sediment lab (Source: Producer defined) Unique identifier for samples; assigned in the sediment lab.
    Date Collected
    Date in MM/DD/YYYY format of sample collection. (Source: Producer defined)
    Range of values
    Minimum:08/03/2015
    Maximum:10/03/2017
    Units:Date in MM/DD/YYYY format
    Time (PDT)
    Time of sample collection, in hours:minutes:seconds format, Pacific Daylight Time (PDT). (Source: Producer defined)
    Range of values
    Minimum:00:00:00
    Maximum:23:59:59
    Units:hours:minutes:seconds format, Pacific Daylight Time (PDT)
    Site
    Unique identifier of sampling locations. (Source: Producer defined)
    ValueDefinition
    CHTUnique station identifier that corresponds with instrument deployment site
    DLTUnique station identifier that corresponds with instrument deployment site
    ITTUnique station identifier that corresponds with instrument deployment site
    LNTUnique station identifier that corresponds with instrument deployment site
    LSTUnique station identifier that corresponds with instrument deployment site
    UATUnique station identifier that corresponds with instrument deployment site
    Latitude
    Latitude of sample location in decimal degrees, north. (Source: Producer defined)
    Range of values
    Minimum:38.26705
    Maximum:38.33349
    Units:Decimal degrees
    Longitude
    Longitude of sample location in decimal degrees, east. (Source: Producer defined)
    Range of values
    Minimum:-121.7961
    Maximum:-121.6579
    Units:Decimal degrees
    Sample Type
    Type of sample collected (Source: Producer defined)
    ValueDefinition
    Petite Ponar grabSample collected using a Petite Ponar grab sampler
    Sample Depth
    The depth in the bed sediment that the sample reached (Source: Producer defined)
    ValueDefinition
    SurfaceThe sample was collected from the bed sediment surface, approximately the top 1 to 2 cm
    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. (Source: producer defined)
    Range of values
    Minimum:0.0
    Maximum:0.404858
    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. (Source: producer defined)
    Range of values
    Minimum:0.0
    Maximum:0.366438
    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. (Source: producer defined)
    Range of values
    Minimum:0.0
    Maximum:0.264747
    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. (Source: producer defined)
    Range of values
    Minimum:0.0
    Maximum:0.185849
    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. (Source: producer defined)
    Range of values
    Minimum:0.0
    Maximum:0.144939
    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. (Source: producer defined)
    Range of values
    Minimum:0.0
    Maximum:0.130328
    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. (Source: producer defined)
    Range of values
    Minimum:0.0
    Maximum:0.092971
    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. (Source: producer defined)
    Range of values
    Minimum:0.0
    Maximum:0.102804
    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. (Source: producer defined)
    Range of values
    Minimum:0.0
    Maximum:0.205608
    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. (Source: producer defined)
    Range of values
    Minimum:0.0
    Maximum:0.852271
    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. (Source: producer defined)
    Range of values
    Minimum:0.0
    Maximum:5.489356
    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. (Source: producer defined)
    Range of values
    Minimum:0.0
    Maximum:13.013166
    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. (Source: producer defined)
    Range of values
    Minimum:0.0
    Maximum:19.611390
    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. (Source: producer defined)
    Range of values
    Minimum:0.0
    Maximum:21.077663
    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. (Source: producer defined)
    Range of values
    Minimum:0.0
    Maximum:16.587204
    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. (Source: producer defined)
    Range of values
    Minimum:0.0
    Maximum:8.999245
    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. (Source: producer defined)
    Range of values
    Minimum:0.043169
    Maximum:5.705626
    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. (Source: producer defined)
    Range of values
    Minimum:0.132328
    Maximum:3.768693
    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. (Source: producer defined)
    Range of values
    Minimum:0.183829
    Maximum:2.493956
    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. (Source: producer defined)
    Range of values
    Minimum:0.412879
    Maximum:3.439039
    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. (Source: producer defined)
    Range of values
    Minimum:0.643805
    Maximum:5.351997
    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. (Source: producer defined)
    Range of values
    Minimum:0.538045
    Maximum:6.563217
    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. (Source: producer defined)
    Range of values
    Minimum:0.453297
    Maximum:6.656274
    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. (Source: producer defined)
    Range of values
    Minimum:0.465599
    Maximum:5.815982
    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. (Source: producer defined)
    Range of values
    Minimum:0.485405
    Maximum:5.274131
    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. (Source: producer defined)
    Range of values
    Minimum:0.446882
    Maximum:5.356165
    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. (Source: producer defined)
    Range of values
    Minimum:0.381123
    Maximum:5.257038
    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. (Source: producer defined)
    Range of values
    Minimum:0.347191
    Maximum:4.857328
    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. (Source: producer defined)
    Range of values
    Minimum:0.337011
    Maximum:4.500772
    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. (Source: producer defined)
    Range of values
    Minimum:0.327195
    Maximum:4.549219
    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. (Source: producer defined)
    Range of values
    Minimum:0.318113
    Maximum:4.608102
    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. (Source: producer defined)
    Range of values
    Minimum:0.326278
    Maximum:4.564447
    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. (Source: producer defined)
    Range of values
    Minimum:0.338390
    Maximum:4.756296
    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. (Source: producer defined)
    Range of values
    Minimum:0.348115
    Maximum:4.935070
    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. (Source: producer defined)
    Range of values
    Minimum:0.353713
    Maximum:5.054194
    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. (Source: producer defined)
    Range of values
    Minimum:0.341973
    Maximum:4.895125
    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. (Source: producer defined)
    Range of values
    Minimum:0.330505
    Maximum:4.716402
    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. (Source: producer defined)
    Range of values
    Minimum:0.312614
    Maximum:4.408640
    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. (Source: producer defined)
    Range of values
    Minimum:0.284998
    Maximum:3.941860
    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. (Source: producer defined)
    Range of values
    Minimum:0.267471
    Maximum:3.624055
    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. (Source: producer defined)
    Range of values
    Minimum:0.253245
    Maximum:3.346114
    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. (Source: producer defined)
    Range of values
    Minimum:0.239755
    Maximum:3.117858
    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. (Source: producer defined)
    Range of values
    Minimum:0.225901
    Maximum:2.919307
    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. (Source: producer defined)
    Range of values
    Minimum:0.210859
    Maximum:2.740526
    Units:percentage
    Wt. percent in 10.00 phi bin or 0.00098 mm bin
    Weight percent of sample with grain diameter between 9.75 and 10.00 phi, or 0.00098 and 0.00116 mm. (Source: producer defined)
    Range of values
    Minimum:0.179313
    Maximum:2.422742
    Units:percentage
    Wt. percent in 10.25 phi bin or 0.00082 mm bin
    Weight percent of sample with grain diameter between 10.00 and 10.25 phi, or 0.00082 and 0.00098 mm. (Source: producer defined)
    Range of values
    Minimum:0.154834
    Maximum:2.296884
    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. (Source: producer defined)
    Range of values
    Minimum:0.115033
    Maximum:1.905925
    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. (Source: producer defined)
    Range of values
    Minimum:0.089991
    Maximum:1.529950
    Units:percentage
    Wt. percent in 11.00 phi bin or 0.00049 mm bin
    Weight percent of sample with grain diameter between 10.75 and 11.00 phi, or 0.00049 and 0.00058 mm. (Source: producer defined)
    Range of values
    Minimum:0.061095
    Maximum:1.069261
    Units:percentage
    Wt. percent in 11.25 phi bin or 0.0004 mm bin
    Weight percent of sample with grain diameter between 11.00 and 11.25 phi, or 0.0004 and 0.00049 mm. (Source: producer defined)
    Range of values
    Minimum:0.033850
    Maximum:0.608255
    Units:percentage
    Wt. percent in 11.50 phi bin or 0.00035 mm bin
    Weight percent of sample with grain diameter between 11.25 and 11.50 phi, or 0.00035 and 0.0004 mm. (Source: producer defined)
    Range of values
    Minimum:0.007926
    Maximum:0.137334
    Units:percentage
    Wt. percent in 12.00 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 . A value of “NA” means no value was measured. (Source: producer defined)
    Range of values
    Minimum:0.0
    Maximum:0.0
    Units:percentage
    Wt. percent in 13.00 phi bin or 0.00012 mm bin
    Weight percent of sample with grain diameter between 12.00 and 13.00 phi, or 0.00012 and 0.000241 mm . A value of “NA” means no value was measured. (Source: producer defined)
    Range of values
    Minimum:0.0
    Maximum:0.0
    Units:percentage
    Percent Gravel
    Percent of sample greater than 2 mm. (Source: Producer defined)
    Range of values
    Minimum:0.0
    Maximum:0.404858
    Units:Percentage
    Percent Sand
    Percent of sample less than 2 mm and greater than 63 microns. (Source: Producer defined)
    Range of values
    Minimum:1.959294
    Maximum:91.355191
    Units:Percentage
    Percent Silt
    Percent of sample less than 63 microns and greater than 4 microns. (Source: Producer defined)
    Range of values
    Minimum:6.138835
    Maximum:67.494725
    Units:Percentage
    Percent Clay
    Percent of sample less than 4 microns. (Source: Producer defined)
    Range of values
    Minimum:2.436884
    Maximum:33.670253
    Units:Percentage
    Percent Mud
    Percent of sample less than 63 microns. (Source: Producer defined)
    Range of values
    Minimum:8.575719
    Maximum:98.040706
    Units:Percentage
    Gravel/Sand
    Ratio of gravel to sand in sample. (Source: Producer defined)
    Range of values
    Minimum:0.000000
    Maximum:0.051000
    Sand/Silt
    Ratio of sand to silt in sample. (Source: Producer defined)
    Range of values
    Minimum:0.030000
    Maximum:14.882000
    Silt/Clay
    Ratio of silt to clay in sample. (Source: Producer defined)
    Range of values
    Minimum:1.912000
    Maximum:2.834000
    Sand/Clay
    Ratio of sand to clay in sample. (Source: Producer defined)
    Range of values
    Minimum:0.058000
    Maximum:37.489000
    Sand/Mud
    Ratio of sand to mud in sample. (Source: Producer defined)
    Range of values
    Minimum:0.020000
    Maximum:10.653000
    Gravel/Mud
    Ratio of gravel to mud in sample. (Source: Producer defined)
    Range of values
    Minimum:0.000000
    Maximum:0.008000
    D5 Phi
    Phi size at D5 for sample. (Source: Producer defined)
    Range of values
    Minimum:1.552000
    Maximum:4.371000
    Units:Phi size
    D10 Phi
    Phi size at D10 for sample. (Source: Producer defined)
    Range of values
    Minimum:1.597000
    Maximum:4.785000
    Units:Phi size
    D16 Phi
    Phi size at D16 for sample. (Source: Producer defined)
    Range of values
    Minimum:1.712000
    Maximum:5.196000
    Units:Phi size
    D25 Phi
    Phi size at D25 for sample. (Source: Producer defined)
    Range of values
    Minimum:1.833000
    Maximum:5.776000
    Units:Phi size
    D50 Phi
    Phi size at D50 for sample. (Source: Producer defined)
    Range of values
    Minimum:2.136000
    Maximum:7.168000
    Units:Phi size
    D75 Phi
    Phi size at D75 for sample. (Source: Producer defined)
    Range of values
    Minimum:2.475000
    Maximum:8.523000
    Units:Phi size
    D84 Phi
    Phi size at D84 for sample. (Source: Producer defined)
    Range of values
    Minimum:2.701000
    Maximum:9.196000
    Units:Phi size
    D90 Phi
    Phi size at D90 for sample. (Source: Producer defined)
    Range of values
    Minimum:3.367000
    Maximum:9.744000
    Units:Phi size
    D95 Phi
    Phi size at D95 for sample. (Source: Producer defined)
    Range of values
    Minimum:6.092000
    Maximum:10.284000
    Units:Phi size
    F-W Median
    Phi size median for sample by Folk and Ward (1957) method. (Source: producer defined)
    Range of values
    Minimum:2.136091
    Maximum:7.168411
    Units:Phi size
    F-W Mean
    Phi size mean for sample by Folk and Ward (1957) method. (Source: producer defined)
    Range of values
    Minimum:2.182935
    Maximum:7.184883
    Units:Phi size
    F-W Sorting
    sorting for sample by Folk and Ward (1957) method. (Source: producer defined)
    Range of values
    Minimum:0.935258
    Maximum:2.664427
    Units:Phi size
    F-W Skewness
    skewness for sample by Folk and Ward (1957) method. (Source: producer defined)
    Range of values
    Minimum:0.009196
    Maximum:0.483637
    Units:Phi size
    F-W Kurtosis
    Kurtosis for sample by Folk and Ward (1957) method. (Source: producer defined)
    Range of values
    Minimum:0.708114
    Maximum:2.899417
    Units:Phi size
    Inman Median
    Phi size median for sample by Inman (1952) method. (Source: producer defined)
    Range of values
    Minimum:2.136091
    Maximum:7.168411
    Units:Phi size
    Inman Mean
    Phi size mean for sample by Inman (1952) method. (Source: producer defined)
    Range of values
    Minimum:2.206357
    Maximum:7.193119
    Units:Phi size
    Inman Sorting
    sorting for sample by Inman (1952) method. (Source: producer defined)
    Range of values
    Minimum:0.494791
    Maximum:2.927919
    Units:Phi size
    Inman Skew 16-84
    skewness for sample (D16-D84) by Inman (1952) method. (Source: producer defined)
    Range of values
    Minimum:-0.007402
    Maximum:0.466323
    Units:Phi size
    Inman Skew 05-95
    skewness for sample (D5-D95) by Inman (1952) method. (Source: producer defined)
    Range of values
    Minimum:0.037834
    Maximum:3.407177
    Units:Phi size
    Inman Kurtosis
    Kurtosis for sample by Inman (1952) method. (Source: producer defined)
    Range of values
    Minimum:0.353024
    Maximum:3.587695
    Units:Phi size
    Trask Median
    mm size median for sample by Trask (1930) method in mm. (Source: producer defined)
    Range of values
    Minimum:0.006952
    Maximum:0.227495
    Units:millimeters
    Trask Mean
    mm size mean for sample by Trask (1930) method in mm. (Source: producer defined)
    Range of values
    Minimum:0.010485
    Maximum:0.230293
    Units:millimeters
    Trask Sorting
    sorting for sample by Trask (1930) method in mm. (Source: producer defined)
    Range of values
    Minimum:1.249075
    Maximum:4.900156
    Units:millimeters
    Trask Skewness
    skewness for sample by Trask (1930) method in mm. (Source: producer defined)
    Range of values
    Minimum:0.257144
    Maximum:1.128412
    Units:millimeters
    Trask Kurtosis
    kurtosis for sample by Trask (1930) method in mm. (Source: producer defined)
    Range of values
    Minimum:0.206201
    Maximum:0.356152
    Units:millimeters
    Mean Phi
    phi size mean for sample. (Source: producer defined)
    Range of values
    Minimum:2.503374
    Maximum:7.191355
    Units:Phi size
    Mean mm
    mm size mean for sample. (Source: producer defined)
    Range of values
    Minimum:0.006842
    Maximum:0.176364
    Units:millimeters
    Variance
    variance for sample. (Source: producer defined)
    Range of values
    Minimum:2.215425
    Maximum:7.187812
    Units:Phi size
    Std. Dev.
    standard deviation for sample. (Source: producer defined)
    Range of values
    Minimum:1.488431
    Maximum:2.681010
    Units:Phi size
    Skewness
    skewness for sample. (Source: producer defined)
    Range of values
    Minimum:-0.054611
    Maximum:3.203197
    Units:Phi size
    Kurtosis
    kurtosis for sample. (Source: producer defined)
    Range of values
    Minimum:2.064576
    Maximum:13.823136
    Units:Phi size
    Mode in Phi
    Mode or modes of sample in phi units. If sample was multi-modal, multiple mode values reported, separated by semicolon. (Source: producer defined)
    Range of values
    Minimum:2.375
    Maximum:7.625
    Units:Phi size

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Joanne C.T. Ferreira
    • Evan T. Dailey
    • Jessica R. Lacy
  2. Who also contributed to the data set?
    Data collection was funded by U.S. Geological Survey
  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

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

Why was the data set created?

These data were used to analyze the grain-size distributions of sediment cores collected in San Pablo Bay, California.

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: 2012 (process 1 of 6)
    Sediment samples were collected from 2011 to 2012 . Sampling positions were recorded using a handheld global navigation satellite system (GNSS) receiver.
    Date: Oct-2017 (process 2 of 6)
    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 sub-sampled and 10 mL of 35 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 2 mm and a 63-um sieve to separate the gravel (greater than 2 mm), sand (63 um to 2 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 2 of millimeter size.
    Date: 20-Jun-2019 (process 3 of 6)
    Edits were made to standardize a few of the "None" keywords. Publications that use these data added to the Cross-References section. Person who carried out this activity:
    Susan A Cochran
    U.S. Geological Survey, Pacific Coastal and Marine Science Center
    2885 Mission St.
    Santa Cruz, CA
    United States

    831-460-7545 (voice)
    scochran@usgs.gov
    Date: 08-Oct-2019 (process 4 of 6)
    Corrected the spelling of one of the Keyword Thesauri. Person who carried out this activity:
    Susan A Cochran
    U.S. Geological Survey, Pacific Coastal and Marine Science Center
    2885 Mission St.
    Santa Cruz, CA
    United States

    831-460-7545 (voice)
    scochran@usgs.gov
    Date: 19-Oct-2020 (process 5 of 6)
    Edited metadata to add keywords section with USGS persistent identifier as theme keyword. No data were changed. Person who carried out this activity:
    U.S. Geological Survey
    Attn: VeeAnn A. Cross
    Marine Geologist
    384 Woods Hole Road
    Woods Hole, MA

    508-548-8700 x2251 (voice)
    508-457-2310 (FAX)
    vatnipp@usgs.gov
    Date: 13-Oct-2021 (process 6 of 6)
    Performed minor edits to the metadata to correct typos. No data were changed. Person who carried out this activity:
    U.S. Geological Survey
    Attn: Susan A. Cochran
    Geologist
    2885 Mission Street
    Santa Cruz, CA

    831-460-7545 (voice)
    scochran@usgs.gov
  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.

    Online Links:

    Other_Citation_Details:
    Folk, R.L., and Ward, W.C., 1957, Brazos River bar; a study in the significance of grain size parameters: Journal of Sedimentary Research, v. 27, n. 1, p. 3-26
    Inman, Douglas Lamar, 1952, Measures for describing the size distribution of sediments.

    Online Links:

    Other_Citation_Details:
    Inman, D.L., 1952, Measures for describing the size distribution of sediments: Journal of Sedimentary Research, v. 22, n. 3, p. 125-145.
    Trask, Parker D., 1930, Mechanical analyses of sediments by centrifuge.

    Online Links:

    Other_Citation_Details:
    Trask, P.D., 1930, Mechanical analyses of sediments by centrifuge: Economic Geology, v. 26, n. 6, p. 581-599.
    MacVean, Lissa J., and Lacy, Jessica R., 2014, Interactions between waves, sediment, and turbulence on a shallow estuarine mudflat: Journal article Journal of Geophysical Research--Oceans, v. 119, p. 1534-1553, American Geophysical Union (AGU), online.

    Online Links:

    Lacy, Jessica R., and MacVean, Lissa J., 2016, Wave attenuation in the shallows of San Francisco Bay: Journal article Coastal Engineering, v. 114, p. 159-168, Elsevier, online.

    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?
    Horizontal accuracy derived from GPS instrumentation is less than 1 m.
  3. How accurate are the heights or depths?
    No formal positional accuracy tests were conducted
  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?
    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 (ITX_GrainSize_2011to2012.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: 13-Oct-2021
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_F7WD3Z2F/ITX_GrainSize_2011to2012_metadata.faq.html>
Generated by mp version 2.9.50 on Thu Oct 14 14:47:21 2021