Grain size, bulk density, and organic carbon of sediment cores from San Pablo Bay and Grizzly Bay, California, 2020 (ver. 1.1, March 2025)

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What does this data set describe?
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Who wrote the metadata?

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 (ver. 1.1, March 2025)

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.

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 (ver. 1.1, March 2025): data release doi:10.5066/P9P7I65U, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, California.
Online Links:
- https://doi.org/10.5066/P9N88U5G
- https://www.sciencebase.gov/catalog/item/60a451d9d34ea221ce45ebe9
This is part of the following larger work.
Lacy, Jessica R., McGill, Samantha C., 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 (ver 1.1, March 2025): data release doi:10.5066/P9N88U5G, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, California.
Online Links:
- https://doi.org/10.5066/P9N88U5G
What geographic area does the data set cover?
West_Bounding_Coordinate: -122.39122
East_Bounding_Coordinate: -122.04072
North_Bounding_Coordinate: 38.11671
South_Bounding_Coordinate: 38.08363
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).
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
What is the general form of this data set?
Geospatial_Data_Presentation_Form: Comma-separated values
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 (545)
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.

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)

Value	Definition
2020-603-FA	Samples 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-FA	Samples 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)

Value	Definition
GBM	Grizzly Bay mooring
PBM	San Pablo Bay mooring
PBM1	San Pablo Bay mooring 1
GBM1	Grizzly Bay mooring 1

Latitude

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

Range of values
Minimum:	38.08363
Maximum:	38.11671
Units:	Decimal degrees

Longitude

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

Range of values
Minimum:	-122.39122
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:	2.757397
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:	60.285359
Maximum:	70.534677
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:	25.087449
Maximum:	36.210837
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:	90.837041
Maximum:	99.333686
Units:	Percentage

Gravel to Sand Ratio

ratio of percent gravel in sample to percent sand, "NA" indicates that no value was calculated. (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, "NA" indicates that no value was calculated. (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, "NA" indicates that no value was calculated. (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, "NA" indicates that no value was calculated. (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, "NA" indicates that no value was calculated. (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, "NA" indicates that no value was calculated. (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

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

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 Phi

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 Phi

skewness for sample by Folk and Ward (1957) method, "NA" indicates that no value was calculated. (Source: producer defined)

Range of values
Minimum:	-0.007602
Maximum:	0.19277
Units:	Phi size

F-W Kurtosis Phi

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

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

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 Phi

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 Phi

skewness for sample (D16-D84) by Inman (1952) method, "NA" indicates that no value was calculated. (Source: producer defined)

Range of values
Minimum:	-0.018309
Maximum:	0.17623
Units:	Phi size

Inman Skew 05-95 Phi

skewness for sample (D5-D95) by Inman (1952) method, "NA" indicates that no value was calculated. (Source: producer defined)

Range of values
Minimum:	-0.039819
Maximum:	0.322598
Units:	Phi size

Inman Kurtosis Phi

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

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 mm

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 mm

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 mm

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:	-0.413909
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:	8.357
Maximum:	20.873
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:	1.175060554
Maximum:	1.447866935
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:	3.093
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:	1.444
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:	0.119
Maximum:	12.035
Units:	grams per cubic centimeter

Entity_and_Attribute_Overview: The first line of the csv file is a header line.
Entity_and_Attribute_Detail_Citation: U.S. Geological Survey

Who produced the data set?

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

From what previous works were the data drawn?
How were the data generated, processed, and modified?

Date: 23-Sep-2020 (process 1 of 5)
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 5)
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 5)
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 5)
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.
Date: 05-Dec-2024 (process 5 of 5)
Percent carbon measurements were added for samples collected on September 23rd 2020. Person who carried out this activity:

Samantha C. McGill

USGS

Oceanographer

2885 Mission Street
Santa Cruz, CA

831-460-7543 (voice)

scmcgill@usgs.gov
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?

How well have the observations been checked?
Data values are within the expected values.
How accurate are the geographic locations?
How accurate are the heights or depths?
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.
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	No access constraints
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.

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
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.
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.

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: 0.136
Network links:	https://www.sciencebase.gov/catalog/file/get/5f405a0e82ce8df5b6cb4b28 https://www.sciencebase.gov/catalog/item/5f405a0e82ce8df5b6cb4b28 https://doi.org/10.5066/P9N88U5G

Cost to order the data: None.

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: 03-Mar-2025
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)

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