Grain size of bed sediment surface samples from south San Francisco Bay, California, summer 2020

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• What does this data set describe?
  1. How might this data set be cited?
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  5. What is the general form of this data set?
  6. How does the data set represent geographic features?
  7. How does the data set describe geographic features?
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What does this data set describe?

1. How might this data set be cited?
   Allen, Rachel M., McGill, Samantha C., and Tan, Angela C., 20211015, Grain size of bed sediment surface samples from south San Francisco Bay, California, summer 2020: data release doi:10.5066/P99Q4CHM, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, California.

   Online Links:

   • https://doi.org/10.5066/P99Q4CHM
   • https://www.sciencebase.gov/catalog/item/602a99d4d34eb1203113b187

   This is part of the following larger work.
   Allen, Rachel M., Lacy, Jessica R., McGill, Samantha C., and Ferreira, Joanne C.T., 20210330, Hydrodynamic, sediment transport, and sediment flocculation data from south San Francisco Bay, California, summer 2020: data release doi:10.5066/P99Q4CHM, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, California.

   Online Links:

   • https://doi.org/10.5066/P99Q4CHM

2. What geographic area does the data set cover?

   West_Bounding_Coordinate: -122.1788
   East_Bounding_Coordinate: -122.1669
   North_Bounding_Coordinate: 37.5491
   South_Bounding_Coordinate: 37.5414
   

3. What does it look like?

   https://www.sciencebase.gov/catalog/file/get/602a99d4d34eb1203113b187?name=CSF20_SiteMap.jpg&allowOpen=true (JPEG)

   Map of study area showing locations of USGS moorings and bed grab locations in the channel and shallows.

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

   Beginning_Date: 16-Jul-2020

   Ending_Date: 30-Jul-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 south San Francisco Bay, California
      

      This is a Point data set. It contains the following vector data types (SDTS terminology):
      • Point (607)
   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?

   CSF20_GrainSizeAnalysis.csv

   Table containing attribute information associated with the dataset (Source: Producer defined)

   FAN ID

   Unique U.S. Geological Survey field activity number (FAN). "NA" indicates that no value was assigned. (Source: Producer defined) Unique U.S. Geological Survey field activity number (FAN).

   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 19=2019), 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:	07/16/2020
   Maximum:	07/30/2020
   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:	08:00:49
   Maximum:	13:45:00
   Units:	hours:minutes:seconds format, Pacific Daylight Time (PDT)

   Decription

   Collection method. (Source: Producer defined)

   Value	Definition
   ponar grab	samples collected with ponar grab
   gomex grab	samples collected with gomex grab

   Latitude

   Latitude of sample location in decimal degrees, north. (Source: Producer defined)

   Range of values
   Minimum:	37.54184
   Maximum:	37.54780
   Units:	Decimal degrees

   Longitude

   Longitude of sample location in decimal degrees, east. (Source: Producer defined)

   Range of values
   Minimum:	-122.16768
   Maximum:	-122.17565
   Units:	Decimal degrees

   Core Depth

   The midpoint of the depth into the sediment bed of the sample. (Source: Producer defined)

   Range of values
   Minimum:	0.25
   Maximum:	7.50
   Units:	centimeters

   Processing Notes

   Relevant information regarding the sample during its processing (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:	0.132621
   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:	0.288888
   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:	0.599365
   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:	0.713481
   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:	0.704229
   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:	0.525344
   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:	0.365993
   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:	0.398892
   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:	0.316646
   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:	0.104573
   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:	0.096071
   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:	0.225155
   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:	0.000061
   Maximum:	0.425134
   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:	0.0056
   Maximum:	0.872752
   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:	0.07003
   Maximum:	1.526384
   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:	0.100043
   Maximum:	1.553295
   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:	0.094040
   Maximum:	1.014122
   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:	0.140060
   Maximum:	0.624282
   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:	0.300019
   Maximum:	0.654420
   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:	0.660281
   Maximum:	1.016506
   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:	1.139992
   Maximum:	1.759672
   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:	1.849986
   Maximum:	2.788052
   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:	2.729980
   Maximum:	3.734879
   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:	3.344415
   Maximum:	4.272701
   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:	3.432681
   Maximum:	4.250592
   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:	3.233891
   Maximum:	3.860538
   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:	3.058539
   Maximum:	3.551509
   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:	3.094539
   Maximum:	3.611535
   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:	3.429391
   Maximum:	3.981692
   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:	3.707373
   Maximum:	4.289968
   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:	3.868224
   Maximum:	4.479967
   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:	3.975664
   Maximum:	4.589966
   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:	4.056501
   Maximum:	4.669965
   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:	4.155485
   Maximum:	4.769965
   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:	4.092589
   Maximum:	4.679965
   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:	4.065369
   Maximum:	4.649966
   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:	3.948136
   Maximum:	4.499967
   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:	3.660618
   Maximum:	4.159969
   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:	3.454154
   Maximum:	3.909971
   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:	3.247936
   Maximum:	3.669973
   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:	3.059905
   Maximum:	3.449974
   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:	2.908076
   Maximum:	3.279976
   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:	2.801356
   Maximum:	3.169977
   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:	2.568740
   Maximum:	2.909978
   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:	2.488417
   Maximum:	2.829979
   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:	2.084027
   Maximum:	2.379982
   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:	1.696960
   Maximum:	1.939986
   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:	1.184297
   Maximum:	1.359990
   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:	0.672785
   Maximum:	0.779994
   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:	0.161468
   Maximum:	0.180077
   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:	0.0
   Maximum:	0.0
   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:	0.0
   Maximum:	0.0
   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:	0.0
   Maximum:	0.0
   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:	1.398094
   Maximum:	12.045763
   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:	54.017363
   Maximum:	61.338545
   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:	33.936875
   Maximum:	38.519715
   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:	87.954237
   Maximum:	98.601906
   Units:	Percentage

   Gravel to Sand Ratio

   ratio of percent gravel in sample to percent sand. (Source: producer defined)

   Range of values
   Minimum:	0.0
   Maximum:	0.0
   Units:	no unit

   Sand to Silt Ratio

   ratio of percent sand in sample to percent silt. (Source: producer defined)

   Range of values
   Minimum:	0.023
   Maximum:	0.223
   Units:	no unit

   Silt to Clay Ratio

   ratio of percent silt in sample to percent clay. (Source: producer defined)

   Range of values
   Minimum:	1.550
   Maximum:	1.674
   Units:	no unit

   Sand to Clay Ratio

   ratio of percent sand in sample to percent clay. (Source: producer defined)

   Range of values
   Minimum:	0.037
   Maximum:	0.355
   Units:	no unit

   Sand to Mud Ratio

   ratio of percent sand in sample to percent mud. (Source: producer defined)

   Range of values
   Minimum:	0.014
   Maximum:	0.137
   Units:	no unit

   Gravel to Mud Ratio

   ratio of percent gravel in sample to percent mud. (Source: producer defined)

   Range of values
   Minimum:	0.0
   Maximum:	0.0
   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:	2.316
   Maximum:	4.540
   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:	3.329
   Maximum:	4.938
   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:	4.533
   Maximum:	5.335
   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:	5.229
   Maximum:	5.973
   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:	7.02
   Maximum:	7.39
   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:	8.598
   Maximum:	8.817
   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:	9.301
   Maximum:	9.467
   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:	9.833
   Maximum:	9.951
   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:	10.346
   Maximum:	10.423
   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:	0.0008
   Units:	millimeters

   D10 mm

   mm size at D10 for sample, "NA" indicates that no value was calculated. (Source: Producer defined)

   Range of values
   Minimum:	0.0010
   Maximum:	0.0011
   Units:	millimeters

   D16 mm

   mm size at D16 for sample, "NA" indicates that no value was calculated. (Source: Producer defined)

   Range of values
   Minimum:	0.0014
   Maximum:	0.0016
   Units:	millimeters

   D25 mm

   mm size at D25 for sample, "NA" indicates that no value was calculated. (Source: Producer defined)

   Range of values
   Minimum:	0.0022
   Maximum:	0.0026
   Units:	millimeters

   D50 mm

   mm size at D50 for sample, "NA" indicates that no value was calculated. (Source: Producer defined)

   Range of values
   Minimum:	0.0060
   Maximum:	0.0077
   Units:	millimeters

   D75 mm

   mm size at D75 for sample, "NA" indicates that no value was calculated. (Source: Producer defined)

   Range of values
   Minimum:	0.0159
   Maximum:	0.0267
   Units:	millimeters

   D84 mm

   mm size at D84 for sample, "NA" indicates that no value was calculated. (Source: Producer defined)

   Range of values
   Minimum:	0.0248
   Maximum:	0.0432
   Units:	millimeters

   D90 mm

   mm size at D90 for sample, "NA" indicates that no value was calculated. (Source: Producer defined)

   Range of values
   Minimum:	0.0326
   Maximum:	0.0995
   Units:	millimeters

   D95 mm

   mm size at D95 for sample, "NA" indicates that no value was calculated. (Source: Producer defined)

   Range of values
   Minimum:	0.0430
   Maximum:	0.2008
   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:	7.019964
   Maximum:	7.390292
   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:	6.951370
   Maximum:	7.397612
   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:	1.925284
   Maximum:	2.408530
   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:	-0.107344
   Maximum:	0.0305160
   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:	0.803234
   Maximum:	0.976966
   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:	7.019964
   Maximum:	7.390292
   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:	6.917074
   Maximum:	7.401272
   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:	2.065848
   Maximum:	2.383646
   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:	-0.043165
   Maximum:	0.009909
   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:	-0.288921
   Maximum:	0.071828
   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:	0.388415
   Maximum:	0.684451
   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:	0.005961
   Maximum:	0.007705
   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:	0.009072
   Maximum:	0.014622
   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:	2.679840
   Maximum:	3.213944
   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:	0.993968
   Maximum:	1.164973
   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:	0.122381
   Maximum:	0.235789
   Units:	millimeters

   Mean Phi

   phi size mean for sample, "NA" indicates that no value was calculated. (Source: producer defined)

   Range of values
   Minimum:	6.758916
   Maximum:	7.399557
   Units:	Phi size

   Mean mm

   mm size mean for sample, "NA" indicates that no value was calculated. (Source: producer defined)

   Range of values
   Minimum:	0.005923
   Maximum:	0.009233
   Units:	millimeters

   Variance Phi

   variance for sample, "NA" indicates that no value was calculated. (Source: producer defined)

   Range of values
   Minimum:	3.368779
   Maximum:	6.244550
   Units:	Phi size

   Std. Dev. Phi

   standard deviation for sample, "NA" indicates that no value was calculated. (Source: producer defined)

   Range of values
   Minimum:	1.835423
   Maximum:	2.498910
   Units:	Phi size

   Skewness Phi

   skewness for sample, "NA" indicates that no value was calculated. (Source: producer defined)

   Range of values
   Minimum:	-0.662683
   Maximum:	0.053508
   Units:	Phi size

   Kurtosis Phi

   kurtosis for sample, "NA" indicates that no value was calculated. (Source: producer defined)

   Range of values
   Minimum:	2.077427
   Maximum:	3.275506
   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)
   • Rachel M. Allen
   • Samantha C. McGill
   • 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 reveal the primary particle grain size of sediment available on the bed at the instrumentation sites. They were collected as part of a collaborative study funded by the San Francisco Estuary Institute on tidal controls of suspended particle size in south San Francisco Bay. 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: 10-Aug-2020 (process 1 of 1)

   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.

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:

   • https://doi.org/10.1306/74D70646-2B21-11D7-8648000102C1865D

   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:

   • https://doi.org/10.1306/D42694DB-2B26-11D7-8648000102C1865D

   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:

   • https://doi.org/10.2113/gsecongeo.25.6.581

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?
   Each sample included the top 0.5 cm of bed sediment; subsampled from Ponar and Gomex grabs. Samples were placed into Whirl-pak bags.
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 (CSF20_GrainSizeAnalysis_data.csv) accompanied by 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?
   • Availability in digital form:

     Data format:	zip file contains the csv table, associated metadata, and an image map of the study area showing sample locations, grain size summaries, and elevation model in format comma-delimited text (version Microsoft Excel 2002 (12527.20988) 64-bit) Size: 0.12
     Network links:	https://www.sciencebase.gov/catalog/file/get/602a99d4d34eb1203113b187 https://www.sciencebase.gov/catalog/item/602a99d4d34eb1203113b187 https://doi.org/10.5066/P99Q4CHM

   • Cost to order the data: None.

5. What hardware or software do I need in order to use the data set?

   The data are 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-Oct-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)