Lab Item 491, A summary of sediment size of one core and 33 grab samples from the Strait of Juan De Fuca.

Frequently-anticipated questions:

• What does this data set describe?
  1. How should 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 should this data set be cited?

   U.S. Naval Oceanographic Office (NavOceanO), Ross, C., Kelly, E.V., Stiles, N.T., Bowman, J., and Ingram, C., 1975, Lab Item 491, A summary of sediment size of one core and 33 grab samples from the Strait of Juan De Fuca.: Laboratory Item 491, U.S. Naval Oceanographic Office, Washington D.C. 20373.

   Online Links:

   • Digital data and downloadable .pdf available at National Geophysical Data Center (NGDC): <http://oas.ngdc.noaa.gov/mgg/plsql/geolin.set_expand?v_mggid=09635012>

   Other_Citation_Details:

   Geological Laboratory, Nearshore Surveys Division, Oceanographic Surveys Department; Navy Desteiguer

2. What geographic area does the data set cover?

   West_Bounding_Coordinate: -123.53

   East_Bounding_Coordinate: -123.42

   North_Bounding_Coordinate: 48.25

   South_Bounding_Coordinate: 48.20

3. What does it look like?

   MGG_09635012 (jpg)

   Screen grab view of locations with coastline for reference

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

   Beginning_Date: 1975

   Ending_Date: 1975

   Currentness_Reference: Publication date

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

   Geospatial_Data_Presentation_Form: Digital and paper

6. How does the data set represent geographic features?
   1. How are geographic features stored in the data set?

      This is a Vector data set. It contains the following vector data types (SDTS terminology):

      • Point (34)

   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 0.01667. Longitudes are given to the nearest 0.01667. Latitude and longitude values are specified in Decimal degrees.

7. How does the data set describe geographic features?

   Point

   SDTS point (Source: Source report)

   Sample number

   Sample number (Source: Source report)

   Alpha numeric number based on project number and core information

   Color

   Wet sediment color determined in the lab (Source: Geological Society of America)

   Color and Munsell color code

   Sediment type

   Sample sediment (Source: Source report)

   Written description of sediment texture

   Remarks

   Remarks (Source: Source report)

   Additional comments about sample

   Grainsize percents

   Percent of sample in defined grainsize (phi_ parameters (Source: Source report)

   Range of values
   Minimum:	< -4
   Maximum:	> 10
   Units:	Percent
   Resolution:	0.001

   Gravel

   Amount of gravel in sample (Source: Source report)

   Range of values
   Minimum:	0
   Maximum:	73.815
   Units:	Percent of gravel
   Resolution:	0.001

   Sand

   Amount of sand in sample (Source: Source report)

   Range of values
   Minimum:	0.073
   Maximum:	77.519
   Units:	Percent
   Resolution:	0.001

   Silt

   Amount of silt in sample (Source: Source report)

   Range of values
   Minimum:	0.035
   Maximum:	40.264
   Units:	Percent
   Resolution:	0.001

   Clay

   Amount of clay in sample (Source: Source report)

   Range of values
   Minimum:	0
   Maximum:	59.663
   Units:	Percent
   Resolution:	0.001

   Mean

   First moment measure of grainsize) (Source: Source report)

   Range of values
   Minimum:	-1.707
   Maximum:	8.518
   Units:	Phi
   Resolution:	0.001

   Standard deviation

   Second moment measure of grainsize (Source: Source report)

   Range of values
   Minimum:	.51
   Maximum:	4.301
   Units:	Phi
   Resolution:	0.001

   Skewness

   Third moment measure of grainsize (Source: Source report)

   Range of values
   Minimum:	.002
   Maximum:	1.104
   Units:	Phi
   Resolution:	0.001

   Kurtosis

   Fourth moment measure of grainsize (Source: Source report)

   Range of values
   Minimum:	-1.406
   Maximum:	6.862
   Units:	Phi
   Resolution:	0.001

Who produced the data set?

1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
   • U.S. Naval Oceanographic Office (NavOceanO)
   • C. Ross
   • E.V. Kelly
   • N.T. Stiles
   • J. Bowman
   • C. Ingram

2. Who also contributed to the data set?

   C. Ross, E.V. Kelly, N.T. Stiles, J. Bowman and C. Ingram at the United States Naval Oceanographic Office for the collection, analysis and archival of data. For inclusion into usSEABED: digitization and formatting April Villagomez(USGS); Corrections: Jane Reid (USGS) and Chris Jenkins (University of Colorado)

3. To whom should users address questions about the data?
   National Geophysical Data Center (NGDC)
   c/o Robin R. Warnken
   E/GC3 325 Broadway
   Boulder, CO 80305-3328
   

   303-497-6338 (voice)
   Robin.R.Warnken@noaa.gov
   

Why was the data set created?

No specific purpose noted in report

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: 1975 (process 1 of 1)

   No process information given in report.

   Person who carried out this activity:
   

   U.S. Naval Oceanographic Office
   Washington, D.C. 20373
   

   Unknown (voice)
   

   Data sources produced in this process:

   • LI 491

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?

   Statistical data was digitized by hand (typed in) at NGDC. For usSEABED, digital data and the scanned reported were downloaded via the web, visually compared to source and corrected. Additional data may have been included from the scanned report, also available online. Where appropriate, data were tested for completeness using MS Excel.

2. How accurate are the geographic locations?

   Navigational techniques not recorded in report; latitudes and longitudes given in degrees and minutes.

3. How accurate are the heights or depths?

   Water depth determination technique not noted in report. Water depths are given, subsample depths in centimeters from top of core.

4. Where are the gaps in the data? What is missing?

   All data available online and in scanned report are included.

5. How consistent are the relationships among the observations, including topology?

   Data fall within normal ranges for the given parameters.

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:

Cite U.S. Naval Oceanographic Office and NGDC as originators of the data

1. Who distributes the data set? (Distributor 1 of 1)
   National Geophysical Data Center (NGDC)
   c/o Robin R. Warnken
   E/GC3 325 Broadway
   Boulder, CO 80305-3328
   

   303-497-6338 (voice)
   Robin.R.Warnken@noaa.gov
   

2. What's the catalog number I need to order this data set?

   MGGID 09635012

3. What legal disclaimers am I supposed to read?

   Although this dataset has been used by the USGS, no warranty, expressed or implied, is made by the USGS as to the accuracy of the data. Users of the data should be aware of limitations of the data due to possible imprecision due to navigational inaccuracies, limitations of the statistical data, and digitizing errors.

4. How can I download or order the data?
   • Availability in digital form:

     Data format:	Text in format ASCII Size: 20 MB
     Network links:	<http://oas.ngdc.noaa.gov/mgg/plsql/geolin.set_expand?v_mggid=09635012>

   • Cost to order the data: None for downloaded data; paper copies may involve a small fee.

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

   web browser and internet access preferred

Who wrote the metadata?

Dates:

Last modified: 2005

Metadata author:

U.S. Geological Survey
c/o Jane A. Reid
Geologist
400 Natural Bridges Drive
Santa Cruz, CA 95060

831-427-4727 (voice)
jareid@usgs.gov

Contact_Instructions: Email preferred

Metadata standard:

CSDGM Version 2 (FGDC-STD-001-1998)