Sediment textures and internal structures: A comparison between central Oregon continental shelf sediments and adjacent coastal sediments.

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Frequently-anticipated questions:

What does this data set describe?

Title:
Sediment textures and internal structures: A comparison between central Oregon continental shelf sediments and adjacent coastal sediments.
Abstract:
"A study of sedimentary structures and sediment texture of beach and continental shelf sediments provides a basis for the interpretation of the recent history of sedimentation on the Oregon continental shelf. The texture of various sediment types suggests that coastal rivers supply a considerable quantity of very fine sand in addition to modern mud to the continental shelf. Relict sediments remain uncovered on areas of the shelf not under the influence of major river runoff and are mixed or covered by modern mud and very fine sand where rivers influence shelf sedimentation. Primary sedimentary structures show that sands ranging from very fine to medium in mean grain size are capable of being moved at shelf water depths from at least 38 to 88 meters. No net transport of sand, however, can be determined from these structures. Organic structures apparently are controlled by water depth and/or grain size and sediment type, which determine faunal composition and concentration. At mid-shelf depths fine sand cores are characterized by shell fragments, worm tubes, and worm trails. Beyond 100 meters water depth worm tubes were not found, but worm trails become abundant and large burrow appear in the sediment."
Supplemental_Information:
Data digitized by the USGS for inclusion into usSEABED. (<http://walrus.wr.usgs.gov/usseabed>)
  1. How should this data set be cited?

    Roush, Robert Cornelius , 1970, Sediment textures and internal structures: A comparison between central Oregon continental shelf sediments and adjacent coastal sediments.: Oregon State University, Corvallis, OR.

    Other_Citation_Details:
    MS Thesis; Research supported by a research assistantship from the U.S. Geological Survey (Contracts 14-08-0001-10766 and 14-08-0001-11941) and in part by National Science Foundation Institutional Sea Grant GH-10

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -124.868
    East_Bounding_Coordinate: -124.047
    North_Bounding_Coordinate: 45.002
    South_Bounding_Coordinate: 43.810

  3. What does it look like?

    Roush_MS_1970 (JPG)
    Screen grab of sample distribution, coastline, and bathymetry

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

    Beginning_Date: 1968
    Ending_Date: 1969
    Currentness_Reference: Publication date

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

    Geospatial_Data_Presentation_Form: 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 (27)

    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 0.00167. Longitudes are given to the nearest 0.00167. 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: Oregon State University)

    Alpha numeric code based on year, month, sample number, and subcore information.

    Subsample depth
    Depth of subsample in boxcore (Source: Source report)

    Range of values
    Minimum:0
    Maximum:0.45
    Units:Phi
    Resolution:0.01

    Gravel
    Amount of gravel in sample (Source: Wentworth 1938)

    Range of values
    Minimum:0
    Maximum:33.3
    Units:Percent
    Resolution:1.0

    Sand
    Amount of sand in sample (Source: Wentworth 1938)

    Range of values
    Minimum:1.3
    Maximum:98.9
    Units:Percent
    Resolution:1.0

    Silt
    Amount of silt in sample (Source: Wentworth 1938)

    Range of values
    Minimum:0
    Maximum:72
    Units:Percent
    Resolution:1.0

    Clay
    Amount of clay in sample (Source: Wentworth 1938)

    Range of values
    Minimum:0
    Maximum:50.2
    Units:percent
    Resolution:1.0

    Mean
    Mean grain size (Source: Folk 1966)

    Range of values
    Minimum:-0.79
    Maximum:7.62
    Units:Phi
    Resolution:0.0001

    Standard deviation
    Standard deviation of grain size (sorting) (Source: Folk 1966)

    Range of values
    Minimum:0.28
    Maximum:4.15
    Units:Phi
    Resolution:0.01

    Skewness
    Skewness of grain size distribution (Source: Folk 1966)

    Range of values
    Minimum:-0.37
    Maximum:0.91
    Units:Unitless
    Resolution:0.01

    Sand mean
    Mean grain size of sand fraction (Source: Folk 1966)

    Range of values
    Minimum:-0.78
    Maximum:3.67
    Units:Phi
    Resolution:0.01

    Sand standard deviation
    Standard deviation of sand fraction dispersion (Source: Folk 1966)

    Range of values
    Minimum:0.23
    Maximum:1.07
    Units:Phi
    Resolution:0.0001

    Sand skewness
    Skewness of sand fraction dispersion (Source: Folk 1966)

    Range of values
    Minimum:-0.75
    Maximum:0.2
    Units:Unitless
    Resolution:0.01

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)

  2. Who also contributed to the data set?

    Robert Cornelius Roush at Oregon State University for the collection and analysis of data. For inclusion into usSEABED: Digitization: Adam Jackson (USGS); Formatting corrections: Jane Reid (USGS) and Chris Jenkins (University of Colorado)

  3. To whom should users address questions about the data?

    College of Oceanic and Atmospheric Sciences, Oregon State University
    104 COAS Admin Bldg
    Corvallis, OR 97331-5503

    541-737-3504 (voice)

Why was the data set created?

"A study of sediments is undertaken to obtain knowledge of environmental factors responsible for the origin, transportation, deposition, and post-depositional changes of a sedimentary deposit. Sedimentary structures and sediment textures are studied in an attempt to define past and present sources of Oregon continental shelf sediments and to understand the processes responsible for their distribution and deposition."

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: Unknown (process 1 of 1)
    Textural data were obtained primarily by particle settling techniques. The coarse fraction (sand) was done by settling tube (Emery, 1938 and Poole, 1957), and the fine fraction (silt and clay) analysis was done by pipette (Krumbein and Pettijohn, 1938). A few samples were too coarse for the settling tube so that sieving at quarter phi intervals was necessary.

    Person who carried out this activity:

    College of Oceanic and Atmospheric Sciences, Oregon State University
    104 COAS Admin Bldg
    Corvallis, OR 97331-5503

    541-737-3504 (voice)

    Data sources used in this process:
    • Krumbein and Pettijohn, 1938
    • Emery, 1938
    • Poole, 1957

    Data sources produced in this process:

    • Roush_MS_1970

  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 estimate made for the accuracy of the data in the original report. Data digitized by the USGS and partners were visually compared to the source data, and corrected. Where appropriate, data were tested for completeness using MS Excel. Locations checked using GIS.

  2. How accurate are the geographic locations?

    No navigational technique given in report. Positions given to degrees, minute-tenths.

  3. How accurate are the heights or depths?

    Water depth determination technique not noted in report. Water depths given in meters.

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

    Appendices I (Box core sample locations), II (Textural analyses of the total sediment continental shelf box cores), and III (Textural analyses of the sand fraction only, continental shelf box cores) were completely digitized for inclusion into usSEABED.

  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: Thesis is available at the USGS library and at other libraries.
Use_Constraints:
Cite R.C. Roush and Oregon State University as originators of the data.

  1. Who distributes the data set? (Distributor 1 of 2)

    College of Oceanic and Atmospheric Sciences, Oregon State University
    104 COAS Admin Bldg
    Corvallis, OR 97331-5503

    541-737-3504 (voice)

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

    R.C. Roush M.S. thesis

  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 and limitations of the statistical data.

  4. How can I download or order the data?

  1. Who distributes the data set? (Distributor 2 of 2)

    U.S. Geological Survey
    345 Middlefield Road
    Menlo Park, CA 94025

    650.329.5026 (voice)
    men_lib@usgs.gov

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

    Roush MS 1970 LD4330 1970 R67

  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 the limitations of the data due to possible imprecision due to navigational inaccuracies, statistical limitations, and digitizing errors.

  4. How can I download or order the data?

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

    None

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)

Generated by mp version 2.8.17 on Sat May 20 21:51:14 2006