Surface-sediment grain-size data from the mouth of the Columbia River, Oregon and Washington, 2013

Frequently anticipated questions:

• What does this data set describe?
  1. How might this data set be cited?
  2. What geographic area does the data set cover?
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
  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?
• Who produced the data set?
  1. Who are the originators of the data set?
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
• Why was the data set created?
• How was the data set created?
  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
  3. What similar or related data should the user be aware of?
• How reliable are the data; what problems remain in the data set?
  1. How well have the observations been checked?
  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?
  5. How consistent are the relationships among the data, including topology?
• How can someone get a copy of the data set?
  1. Are there legal restrictions on access or use of the data?
  2. Who distributes the data?
  3. What's the catalog number I need to order this data set?
  4. What legal disclaimers am I supposed to read?
  5. How can I download or order the data?
• Who wrote the metadata?

What does this data set describe?

1. How might this data set be cited?
   Stevens, Andrew W., Gelfenbaum, Guy, MacMahan, Jamie, Reniers, Ad J.H.M., Elias, Edwin P., Sherwood, Christopher R., and Carlson, Emily M., 2017, Surface-sediment grain-size data from the mouth of the Columbia River, Oregon and Washington, 2013: data release DOI:10.5066/F7NG4NS1, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, CA.

   Online Links:

   • https://doi.org/10.5066/F7NG4NS1

   This is part of the following larger work.
   Stevens, Andrew W., Gelfenbaum, Guy, MacMahan, Jamie, Reniers, Ad J.H.M., Elias, Edwin P., Sherwood, Christopher R., and Carlson, Emily M., 2017, Oceanographic measurements and hydrodynamic modeling of the mouth of the Columbia River, Oregon and Washington, 2013: data release DOI:10.5066/F7NG4NS1, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, CA.

   Online Links:

   • https://doi.org/10.5066/F7NG4NS1

2. What geographic area does the data set cover?

   West_Bounding_Coordinate: -124.064880
   East_Bounding_Coordinate: -123.971690
   North_Bounding_Coordinate: 46.264960
   South_Bounding_Coordinate: 46.230720
   

3. What does it look like?

   https://www.sciencebase.gov/catalog/file/get/590795e0e4b0fc4e448eb01d?name=mcr13_grainsize.png&allowOpen=true (PNG)

   Bar chart of grain size distributions

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

   Calendar_Date: 09-May-2013

   Currentness_Reference:

   ground condition at time the samples were collected

5. What is the general form of this data set?

   Geospatial_Data_Presentation_Form: comma-delimited spreadsheet (.csv file)
   

6. How does the data set represent geographic features?
   1. How are geographic features stored in the data set?
      This is a Point data set. It contains the following vector data types (SDTS terminology):
      • Point (3)
   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-6. Longitudes are given to the nearest 1.0E-6. Latitude and longitude values are specified in Decimal degrees. The horizontal datum used is WGS1984.
      The ellipsoid used is WGS1984.
      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?

   Attribute Table

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

   FACS/FAN I.D.

   Unique U.S. Geological Survey field activity identifier (Source: producer defined) Unique identifier for the U.S. Geological Survey field activity

   Sample ID

   Name of sample (Source: producer defined) Unique identifier for the sample used given in the field

   Sample Recovered

   Flag to indicate whether sample was recovered (Source: producer defined)

   Value	Definition
   Yes	Sample collection successful at site, sample collected

   Date Collected

   Date of sample collection in mm/dd/yyyy format (Source: producer defined)

   Range of values
   Minimum:	5/09/2013
   Maximum:	5/09/2013
   Units:	Dates in mm/dd/yyyy format

   Time (GMT)

   Time of sample collection in HH:MM:SS format relative to Greenwich Mean Time (GMT) (Source: producer defined)

   Range of values
   Minimum:	00:00:00
   Maximum:	23:59:59
   Units:	Times in HH:MM:SS format

   Latitude (deg. N)

   Latitude of sample in decimal degrees, north (Source: producer defined)

   Range of values
   Minimum:	46.230720
   Maximum:	46.264960
   Units:	decimal degrees

   Longitude (deg. E)

   Longitude of sample in decimal degrees, east (Source: producer defined)

   Range of values
   Minimum:	-124.064880
   Maximum:	-123.971690
   Units:	decimal degrees

   Sample Type

   Type of sample collected (Source: Produce defined)

   Value	Definition
   Grab	Sample collected with grab sampler from boat

   Wt. percent in -1.00 phi bin

   Weight percent of sample with grain diameter greater than -1.00 phi. (Source: producer defined)

   Range of values
   Minimum:	0
   Maximum:	100
   Units:	percentage

   Wt. percent in -0.75 phi bin

   Weight percent of sample with grain diameter between -1.00 and -0.75 phi. (Source: producer defined)

   Range of values
   Minimum:	0
   Maximum:	100
   Units:	percentage

   Wt. percent in -0.50 phi bin

   Weight percent of sample with grain diameter between -0.75 and -0.50 phi. (Source: producer defined)

   Range of values
   Minimum:	0
   Maximum:	100
   Units:	percentage

   Wt. percent in -0.25 phi bin

   Weight percent of sample with grain diameter between -0.50 and -0.25 phi. (Source: producer defined)

   Range of values
   Minimum:	0
   Maximum:	100
   Units:	percentage

   Wt. percent in 0.00 phi bin

   Weight percent of sample with grain diameter between -0.25 and 0.00 phi. (Source: producer defined)

   Range of values
   Minimum:	0
   Maximum:	100
   Units:	percentage

   Wt. percent in 0.25 phi bin

   Weight percent of sample with grain diameter between 0.00 and 0.25 phi. (Source: producer defined)

   Range of values
   Minimum:	0
   Maximum:	100
   Units:	percentage

   Wt. percent in 0.50 phi bin

   Weight percent of sample with grain diameter between 0.25 and 0.50 phi. (Source: producer defined)

   Range of values
   Minimum:	0
   Maximum:	100
   Units:	percentage

   Wt. percent in 0.75 phi bin

   Weight percent of sample with grain diameter between 0.50 and 0.75 phi. (Source: producer defined)

   Range of values
   Minimum:	0
   Maximum:	100
   Units:	percentage

   Wt. percent in 1.00 phi bin

   Weight percent of sample with grain diameter between 0.75 and 1.00 phi. (Source: producer defined)

   Range of values
   Minimum:	0
   Maximum:	100
   Units:	percentage

   Wt. percent in 1.25 phi bin

   Weight percent of sample with grain diameter between 1.00 and 1.25 phi. (Source: producer defined)

   Range of values
   Minimum:	0
   Maximum:	100
   Units:	percentage

   Wt. percent in 1.50 phi bin

   Weight percent of sample with grain diameter between 1.25 and 1.50 phi. (Source: producer defined)

   Range of values
   Minimum:	0
   Maximum:	100
   Units:	percentage

   Wt. percent in 1.75 phi bin

   Weight percent of sample with grain diameter between 1.50 and 1.75 phi. (Source: producer defined)

   Range of values
   Minimum:	0
   Maximum:	100
   Units:	percentage

   Wt. percent in 2.00 phi bin

   Weight percent of sample with grain diameter between 1.75 and 2.00 phi. (Source: producer defined)

   Range of values
   Minimum:	0
   Maximum:	100
   Units:	percentage

   Wt. percent in 2.25 phi bin

   Weight percent of sample with grain diameter between 2.00 and 2.25 phi. (Source: producer defined)

   Range of values
   Minimum:	0
   Maximum:	100
   Units:	percentage

   Wt. percent in 2.50 phi bin

   Weight percent of sample with grain diameter between 2.25 and 2.50 phi. (Source: producer defined)

   Range of values
   Minimum:	0
   Maximum:	100
   Units:	percentage

   Wt. percent in 2.75 phi bin

   Weight percent of sample with grain diameter between 2.50 and 2.75 phi. (Source: producer defined)

   Range of values
   Minimum:	0
   Maximum:	100
   Units:	percentage

   Wt. percent in 3.00 phi bin

   Weight percent of sample with grain diameter between 2.75 and 3.00 phi. (Source: producer defined)

   Range of values
   Minimum:	0
   Maximum:	100
   Units:	percentage

   Wt. percent in 3.25 phi bin

   Weight percent of sample with grain diameter between 3.00 and 3.25 phi. (Source: producer defined)

   Range of values
   Minimum:	0
   Maximum:	100
   Units:	percentage

   Wt. percent in 3.50 phi bin

   Weight percent of sample with grain diameter between 3.25 and 3.50 phi. (Source: producer defined)

   Range of values
   Minimum:	0
   Maximum:	100
   Units:	percentage

   Wt. percent in 3.75 phi bin

   Weight percent of sample with grain diameter between 3.50 and 3.75 phi. (Source: producer defined)

   Range of values
   Minimum:	0
   Maximum:	100
   Units:	percentage

   Wt. percent in 4.00 phi bin

   Weight percent of sample with grain diameter between 3.75 and 4.00 phi. (Source: producer defined)

   Range of values
   Minimum:	0
   Maximum:	100
   Units:	percentage

   Wt. percent in 4.25 phi bin

   Weight percent of sample with grain diameter between 4.00 and 4.25 phi. (Source: producer defined)

   Range of values
   Minimum:	0
   Maximum:	100
   Units:	percentage

   Wt. percent in 4.50 phi bin

   Weight percent of sample with grain diameter between 4.25 and 4.50 phi. (Source: producer defined)

   Range of values
   Minimum:	0
   Maximum:	100
   Units:	percentage

   Wt. percent in 4.75 phi bin

   Weight percent of sample with grain diameter between 4.50 and 4.75 phi. (Source: producer defined)

   Range of values
   Minimum:	0
   Maximum:	100
   Units:	percentage

   Wt. percent in 5.00 phi bin

   Weight percent of sample with grain diameter between 4.75 and 5.00 phi. (Source: producer defined)

   Range of values
   Minimum:	0
   Maximum:	100
   Units:	percentage

   Wt. percent in 5.25 phi bin

   Weight percent of sample with grain diameter between 5.00 and 5.25 phi. (Source: producer defined)

   Range of values
   Minimum:	0
   Maximum:	100
   Units:	percentage

   Wt. percent in 5.50 phi bin

   Weight percent of sample with grain diameter between 5.25 and 5.50 phi. (Source: producer defined)

   Range of values
   Minimum:	0
   Maximum:	100
   Units:	percentage

   Wt. percent in 5.75 phi bin

   Weight percent of sample with grain diameter between 5.50 and 5.75 phi. (Source: producer defined)

   Range of values
   Minimum:	0
   Maximum:	100
   Units:	percentage

   Wt. percent in 6.00 phi bin

   Weight percent of sample with grain diameter between 5.75 and 6.00 phi. (Source: producer defined)

   Range of values
   Minimum:	0
   Maximum:	100
   Units:	percentage

   Wt. percent in 6.25 phi bin

   Weight percent of sample with grain diameter between 6.00 and 6.25 phi. (Source: producer defined)

   Range of values
   Minimum:	0
   Maximum:	100
   Units:	percentage

   Wt. percent in 6.50 phi bin

   Weight percent of sample with grain diameter between 6.25 and 6.50 phi. (Source: producer defined)

   Range of values
   Minimum:	0
   Maximum:	100
   Units:	percentage

   Wt. percent in 6.75 phi bin

   Weight percent of sample with grain diameter between 6.50 and 6.75 phi. (Source: producer defined)

   Range of values
   Minimum:	0
   Maximum:	100
   Units:	percentage

   Wt. percent in 7.00 phi bin

   Weight percent of sample with grain diameter between 6.75 and 7.00 phi. (Source: producer defined)

   Range of values
   Minimum:	0
   Maximum:	100
   Units:	percentage

   Wt. percent in 7.25 phi bin

   Weight percent of sample with grain diameter between 7.00 and 7.25 phi. (Source: producer defined)

   Range of values
   Minimum:	0
   Maximum:	100
   Units:	percentage

   Wt. percent in 7.50 phi bin

   Weight percent of sample with grain diameter between 7.25 and 7.50 phi. (Source: producer defined)

   Range of values
   Minimum:	0
   Maximum:	100
   Units:	percentage

   Wt. percent in 7.75 phi bin

   Weight percent of sample with grain diameter between 7.50 and 7.75 phi. (Source: producer defined)

   Range of values
   Minimum:	0
   Maximum:	100
   Units:	percentage

   Wt. percent in 8.00 phi bin

   Weight percent of sample with grain diameter between 7.75 and 8.00 phi. (Source: producer defined)

   Range of values
   Minimum:	0
   Maximum:	100
   Units:	percentage

   Wt. percent in 8.25 phi bin

   Weight percent of sample with grain diameter between 8.00 and 8.25 phi. (Source: producer defined)

   Range of values
   Minimum:	0
   Maximum:	100
   Units:	percentage

   Wt. percent in 8.50 phi bin

   Weight percent of sample with grain diameter between 8.25 and 8.50 phi. (Source: producer defined)

   Range of values
   Minimum:	0
   Maximum:	100
   Units:	percentage

   Wt. percent in 8.75 phi bin

   Weight percent of sample with grain diameter between 8.50 and 8.75 phi. (Source: producer defined)

   Range of values
   Minimum:	0
   Maximum:	100
   Units:	percentage

   Wt. percent in 9.00 phi bin

   Weight percent of sample with grain diameter between 8.75 and 9.00 phi. (Source: producer defined)

   Range of values
   Minimum:	0
   Maximum:	100
   Units:	percentage

   Wt. percent in 9.25 phi bin

   Weight percent of sample with grain diameter between 9.00 and 9.25 phi. (Source: producer defined)

   Range of values
   Minimum:	0
   Maximum:	100
   Units:	percentage

   Wt. percent in 9.50 phi bin

   Weight percent of sample with grain diameter between 9.25 and 9.50 phi. (Source: producer defined)

   Range of values
   Minimum:	0
   Maximum:	100
   Units:	percentage

   Wt. percent in 9.75 phi bin

   Weight percent of sample with grain diameter between 9.50 and 9.75 phi. (Source: producer defined)

   Range of values
   Minimum:	0
   Maximum:	100
   Units:	percentage

   Wt. percent in 10.00 phi bin

   Weight percent of sample with grain diameter between 9.75 and 10.00 phi. (Source: producer defined)

   Range of values
   Minimum:	0
   Maximum:	100
   Units:	percentage

   Wt. percent in 10.25 phi bin

   Weight percent of sample with grain diameter between 10.00 and 10.25 phi. (Source: producer defined)

   Range of values
   Minimum:	0
   Maximum:	100
   Units:	percentage

   Wt. percent in 10.50 phi bin

   Weight percent of sample with grain diameter between 10.25 and 10.50 phi. (Source: producer defined)

   Range of values
   Minimum:	0
   Maximum:	100
   Units:	percentage

   Wt. percent in 10.75 phi bin

   Weight percent of sample with grain diameter between 10.50 and 10.75 phi. (Source: producer defined)

   Range of values
   Minimum:	0
   Maximum:	100
   Units:	percentage

   Wt. percent in 11.00 phi bin

   Weight percent of sample with grain diameter between 10.75 and 11.00 phi. (Source: producer defined)

   Range of values
   Minimum:	0
   Maximum:	100
   Units:	percentage

   Wt. percent in 11.25 phi bin

   Weight percent of sample with grain diameter between 11.00 and 11.25 phi. (Source: producer defined)

   Range of values
   Minimum:	0
   Maximum:	100
   Units:	percentage

   Wt. percent in 11.50 phi bin

   Weight percent of sample with grain diameter between 11.25 and 11.50 phi. (Source: producer defined)

   Range of values
   Minimum:	0
   Maximum:	100
   Units:	percentage

   Wt. percent in 12.00 phi bin

   Weight percent of sample with grain diameter between 11.50 and 12.00 phi. (Source: producer defined)

   Range of values
   Minimum:	0
   Maximum:	100
   Units:	percentage

   Wt. percent in 13.00 phi bin

   Weight percent of sample with grain diameter between 12.00 and 13.00 phi. (Source: producer defined)

   Range of values
   Minimum:	0
   Maximum:	100
   Units:	percentage

   Percent Gravel

   percent of sample greater than 2 mm. (Source: producer defined)

   Range of values
   Minimum:	0
   Maximum:	100
   Units:	percentage

   Percent Sand

   percent of sample less than 2 mm and greater than 63 microns. (Source: producer defined)

   Range of values
   Minimum:	0
   Maximum:	100
   Units:	percentage

   Percent Silt

   percent of sample less than 63 microns and greater than 4 microns. (Source: producer defined)

   Range of values
   Minimum:	0
   Maximum:	100
   Units:	percentage

   Percent Clay

   percent of sample less than 4 microns. (Source: producer defined)

   Range of values
   Minimum:	0
   Maximum:	100
   Units:	percentage

   Percent Mud

   percent of sample less than 63 microns. (Source: producer defined)

   Range of values
   Minimum:	0
   Maximum:	100
   Units:	percentage

   D5 Phi

   Phi size at D5 for sample. (Source: producer defined)

   Range of values
   Minimum:	-4
   Maximum:	13
   Units:	Phi size

   D10 Phi

   Phi size at D10 for sample. (Source: producer defined)

   Range of values
   Minimum:	-4
   Maximum:	13
   Units:	Phi size

   D16 Phi

   Phi size at D16 for sample. (Source: producer defined)

   Range of values
   Minimum:	-4
   Maximum:	13
   Units:	Phi size

   D25 Phi

   Phi size at D25 for sample. (Source: producer defined)

   Range of values
   Minimum:	-4
   Maximum:	13
   Units:	Phi size

   D50 Phi

   Phi size at D50, or average particle diameter by mass, for sample. (Source: producer defined)

   Range of values
   Minimum:	-4
   Maximum:	13
   Units:	Phi size

   D75 Phi

   Phi size at D75 for sample. (Source: producer defined)

   Range of values
   Minimum:	-4
   Maximum:	13
   Units:	Phi size

   D84 Phi

   Phi size at D84 for sample. (Source: producer defined)

   Range of values
   Minimum:	-4
   Maximum:	13
   Units:	Phi size

   D90 Phi

   Phi size at D90 for sample. (Source: producer defined)

   Range of values
   Minimum:	-4
   Maximum:	13
   Units:	Phi size

   D95 Phi

   Phi size at D95 for sample. (Source: producer defined)

   Range of values
   Minimum:	-4
   Maximum:	13
   Units:	Phi size

   F-W Median

   Phi size median for sample by Folk and Ward (1957) method. (Source: producer defined)

   Range of values
   Minimum:	1.268
   Maximum:	2.019
   Units:	Phi size

   F-W Mean

   Phi size mean for sample by Folk and Ward (1957) method. (Source: producer defined)

   Range of values
   Minimum:	1.272
   Maximum:	2.028
   Units:	Phi size

   F-W Sorting

   sorting for sample by Folk and Ward (1957) method. (Source: producer defined)

   Range of values
   Minimum:	0.441
   Maximum:	0.667
   Units:	Phi size

   F-W Skewness

   skewness for sample by Folk and Ward (1957) method. (Source: producer defined)

   Range of values
   Minimum:	0.051
   Maximum:	0.074
   Units:	Phi size

   F-W Kurtosis

   Kurtosis for sample by Folk and Ward (1957) method. (Source: producer defined)

   Range of values
   Minimum:	1.029
   Maximum:	1.225
   Units:	Phi size

   Inman Median

   Phi size median for sample by Inman (1952) method. (Source: producer defined)

   Range of values
   Minimum:	1.268
   Maximum:	2.019
   Units:	Phi size

   Inman Mean

   Phi size mean for sample by Inman (1952) method. (Source: producer defined)

   Range of values
   Minimum:	1.274
   Maximum:	2.032
   Units:	Phi size

   Inman Sorting

   sorting for sample by Inman (1952) method. (Source: producer defined)

   Range of values
   Minimum:	0.432
   Maximum:	0.610
   Units:	Phi size

   Inman Skew 16-84

   skewness for sample (D16-D84) by Inman (1952) method. (Source: producer defined)

   Range of values
   Minimum:	0.010
   Maximum:	0.030
   Units:	Phi size

   Inman Skew 05-95

   skewness for sample (D5-D95) by Inman (1952) method. (Source: producer defined)

   Range of values
   Minimum:	0.124
   Maximum:	0.250
   Units:	Phi size

   Inman Kurtosis

   Kurtosis for sample by Inman (1952) method. (Source: producer defined)

   Range of values
   Minimum:	0.716
   Maximum:	0.962
   Units:	Phi size

   Moment 1 Mean

   moment measure of mean. (Source: producer defined)

   Range of values
   Minimum:	1.362
   Maximum:	2.070
   Units:	Phi size

   Moment 2 Variance

   moment measure of variance. (Source: producer defined)

   Range of values
   Minimum:	0.520
   Maximum:	1.041
   Units:	Phi size

   Moment 3 Skewness

   moment measure of skewness. (Source: producer defined)

   Range of values
   Minimum:	3.555
   Maximum:	4.891
   Units:	Phi size

   Moment 4 Kurtosis

   moment measure of kurtosis. (Source: producer defined)

   Range of values
   Minimum:	25.882
   Maximum:	46.676
   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)
   • Andrew W. Stevens
   • Guy Gelfenbaum
   • Jamie MacMahan
   • Ad J.H.M. Reniers
   • Edwin P. Elias
   • Christopher R. Sherwood
   • Emily M. Carlson
2. Who also contributed to the data set?
3. To whom should users address questions about the data?
   Andrew W. Stevens

   U.S. Geological Survey, Pacific Coastal and Marine Science Center

   2885 Mission St.

   Santa Cruz, CA
   

   USA

   831-460-7424 (voice)

   astevens@usgs.gov

Why was the data set created?

These grain-size data were collected as a part of a larger investigation into the hydrodynamics of the mouth of the Columbia River, Oregon and Washington, in 2013.

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: 09-May-2013 (process 1 of 3)

   Surface sediment was collected on May 9, 2013 at 3 locations using a small ponar, or 'grab', sampler from the F/V Cape Windy in the mouth of the Columbia River. A hand-held global satellite navigation system (GNSS) receiver was used to determine the locations of sediment samples.

   Date: 23-Jan-2014 (process 2 of 3)

   The grain-size distributions 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 2 mm and 63 um sieves 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.

   Date: 19-Oct-2020 (process 3 of 3)

   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

3. What similar or related data should the user be aware of?

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

1. How well have the observations been checked?
   No formal attribute accuracy tests were conducted
2. How accurate are the geographic locations?
   The locations of samples were determined using a Garmin 76Cx handheld global satellite navigation systems (GNSS) receiver capable of receiving wide area augmentation system (WAAS) signals. The manufacturer reported accuracy for horizontal positions is 3-5 m while receiving WAAS signals.
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?
   Dataset is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record carefully for additional details.
5. How consistent are the relationships among the observations, including topology?
   No formal logical accuracy tests were conducted

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?

Access_Constraints: none
Use_Constraints:

USGS-authored or produced data and information are in the public domain from the U.S. Government and are freely redistributable with proper metadata and source attribution. Please recognize and acknowledge the U.S. Geological Survey as the originator(s) of the dataset and in products derived from these data.

1. Who distributes the data set? (Distributor 1 of 1)
   
   U.S. Geological Survey - Science Base

   U.S. Geological Survey

   Denver Federal Center, Building 810, Mail Stop 302

   Denver, CO
   

   USA

   1-888-275-8747 (voice)

   sciencebase@usgs.gov
2. What's the catalog number I need to order this data set? Grain-size analyses data are presented as a comma-delimited text file (.csv), along with associated 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:	comma-delimited text file in format comma-delimited text (version Microsoft Excel 14.0.7173.5000) CSV Size: 0.004
     Network links:	https://www.sciencebase.gov/catalog/file/get/590795e0e4b0fc4e448eb01d/?name=mcr13_grainsize.csv https://doi.org/10.5066/F7NG4NS1

     Data format:	PNG image showing bar chart of grain-size distributions in format png (version Matlab 9.0.0.341360) Size: 0.08
     Network links:	https://www.sciencebase.gov/catalog/file/get/590795e0e4b0fc4e448eb01d?name=mcr13_grainsize.png https://doi.org/10.5066/F7NG4NS1

   • Cost to order the data: None

Who wrote the metadata?

Dates:

Last modified: 19-Oct-2020

Metadata author:

Andrew W. Stevens

U.S. Geological Survey, Pacific Coastal and Marine Science Center

Oceanographer

2885 Mission St.

Santa Cruz, CA

USA

831-460-7424 (voice)

astevens@usgs.gov

Metadata standard:

Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)