Mineralogical and sedimentological data collected on the shelf and upper slope adjacent to the Russian River, northern California

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Frequently-anticipated questions:

What does this data set describe?

Mineralogical and sedimentological data collected on the shelf and upper slope adjacent to the Russian River, northern California
Abstract: No formal abstract is given.
" This report documents textural and mineralogical analyses of surface sediment from the shelf and upper slope of the continental margin west of the Russian River, Northern California (Fig. 1). The samples were collected on cruises V180NC, L180NC,and L1381NC. Fifty-six sampling stations were occupied (Fig. 2 and Table 1) and sediment samples were collected using gravity, piston trigger-weight, van Veen and box corers." Data digitized for inclusion into usSEABED (<http://walrus.wr.usgs.gov/usseabed>)
  1. How should this data set be cited?

    Gardner, James V. , and Klise, David H. , 1983, Mineralogical and sedimentological data collected on the shelf and upper slope adjacent to the Russian River, northern California: Open-file report 83-517, U.S. Geological Survey, Menlo Park, CA.

    Online Links:

    Data from USGS cruise V180NC (<http://walrus.wr.usgs.gov/infobank/v/v180nc/html/v-1-80-nc.meta.html>), cruise L180NC (<http://walrus.wr.usgs.gov/infobank/l/l180nc/html/l-1-80-nc.meta.html>) and cruise L1381NC (<http://walrus.wr.usgs.gov/infobank/l/l1381nc/html/l-13-81-nc.meta.html>).

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -123.8900
    East_Bounding_Coordinate: -123.0167
    North_Bounding_Coordinate: 38.6677
    South_Bounding_Coordinate: 38.2845

  3. What does it look like?

    OFR_83_517 (JPG)
    Screen grab of GIS-produced sample distribution, with bathymetry and land for reference.

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

    Beginning_Date: 08-Apr-1980
    Ending_Date: 23-Oct-1981
    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 (56)

    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 0.00001. Longitudes are given to the nearest 0.00001. Latitude and longitude values are specified in Decimal degrees.

  7. How does the data set describe geographic features?

    SDTS point (Source: Source report)

    Sample number
    Sample number (Source: US Geological Survey)

    Alpha numeric number based on cruise and core information

    Water depth
    Depth of water at sample site (Source: Source report)

    Range of values

    Gravel (Source: Wentworth, 1932)

    Range of values

    Sand (Source: Wentworth 1932)

    Range of values

    Silt (Source: Wentworth 1932)

    Range of values

    Clay (Source: Wentworth 1932)

    Range of values

    Median grainsize (Source: Source report)

    Range of values

    Mean grainsize (Source: Folk, 1974)

    Range of values

    Standard deviation about the grain size mean (Source: Folk, 1974)

    Range of values

    Skewness of grain size distribution (Source: Folk, 1974)

    Range of values

    Kurtosis of grain size distribution (Source: Folk, 1974)

    Range of values

    Percentages of mineral components
    Percentages of mineral components (Source: Source report)

    Percentages of quartz, feldspar, green hornblende, brown hornblende, termolite, glaucophane, epidote, orthopyroxene, clinopyroxene, serpentine, glauconite, biotite, muscovite, chlorite, brittle mica, glass, isotropic minerals, sphene, zircon, lawsonite, garnet, carbonate, zeolite, chromite, volcanic rock fragments, metamorphic rock fragments, altered sedimentary rock fragments, unaltered sedimentary rock fragments, chert, plutonic rock fragments, unknown rock fragments, fecal pellets, opaque minerals, unknowns minerals, and other minerals for selected samples.

    Clay mineral percentages
    Clay mineral percentages (Source: Source report)

    Percentages of smectite, illite, and kaolinite + chlorite for selected samples.

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?

    James V. Gardner and David Klise at the USGS for collection and analysis of data. For usSEABED, digitization and formatting: Jennifer Mendonca (USGS); Formatting corrections: Jane Reid (USGS) and Chris Jenkins (University of Colorado)

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

    United States Geological Survey
    USGS Information Services
    Denver, CO 80225

    1-800-ASK-USGS (voice)

Why was the data set created?

No purpose is given.

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)
    Core samples and subsamples taken aboard ship were sealed to minimize dehydration and were stored at 3°C until the analytical phase began. Sample were first treated with 30% H202 to remove organic material, then placed in a 10-ml solution of 30% H202 and 50-ml of H20 and allowed to stand for 24 hr or until oxidation ceased. Excess liquid and salt were removed by repeated washes with distilled water. Following this treatment, the samples were separated into gravel, sand, silt, and clay using wet-sieves and/or centrifuge techniques. Grain-size analyses were made by first determining the dry-weight percent of the gravel, sand, silt, and clay size fractions. The size distributions of sand fraction ( -1.0 to 4.0 phi) were then determined using a 2-m Rapid Sediment Analyser (RSA) (Thiede, et al., 1976). The size distribution of the silt and clay fractions (<4.0 phi) were determined using a calibrated hydrophotometer (Jordan, 1977; Jordan, et al., 1971. The grain-size data were used to calculate sediment textural parameters by the graphic method of Folk (1974). The textural parameters include percent sand, percent silt, percent clay, median, mode, graphic mean, inclusive graphic standard deviation, and inclusive graphic skewness. The values of these textural parameters for the surface samples are given in Table 2.

    Person who carried out this activity:

    U.S. Geological Survey
    c/o Michael Torresan
    USGS Coastal and Marine Geology
    Menlo Park, CA 94025

    650-329-5493 (voice)

    Data sources used in this process:
    • Folk, 1974
    • Jordan 1977
    • Jordan and others, 1971
    • Thiede et al., 1976

    Data sources produced in this process:

    • OFR_83_517

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

    Klise, David H. , 198306, Modern sedimentation on the California continental margin adjacent to the Russian River: San Jose State University, San Jose, CA.

    Masters thesis; Data exactly duplicates OFR 83-517. Discussion of data in the setting and conclusions are provided.

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

  1. How well have the observations been checked?

    For the original data, replicate analyses and calibration tests show that the RSA has a precision of +/- 5% and an accuracy of +/- 5%, and that the hydrophotometer has a precision of +/- 10% and an accuracy of +/- 2%. For usSEABED, data were digitized, visually compared to the source and corrected. Where appropriate, data were tested for completeness using MS Excel. Locations checked using GIS.

  2. How accurate are the geographic locations?

    Navigation during all cruises was by Miniranger and provided nominal position accuracy of +/- 50 m.

  3. How accurate are the heights or depths?

    Water depth determination probably by 3.5 kHz profiling systems. Subsample depths given as nearest centimeter.

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

    No estimate made for original data. For inclusion into usSEABED, all textural data in the report were included; Petrographic and clay mineral analyses will be included at a later date.

  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?

None. Paper copy of report is available through the USGS, and is also available online.
Cite James V. Gardner, David Klise, and the U.S. Geological Survey as the originators of the data.

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

    United States Geological Survey
    USGS Information Services
    Denver, CO 80225

    1-800-ASK-USGS (voice)

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

    Open file report 83-517

  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?

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

    Plug-in not required, but best viewed with downloadable program DjVu at <http://www.lizardtech.com/download/dl_options.php?page=plugins>

Who wrote the metadata?

Last modified: 2005
Metadata author:
U.S. Geological Survey
c/o Jane A. Reid
400 Natural Bridges Drive
Santa Cruz, CA 95060

831-427-4727 (voice)

Contact_Instructions: Email preferred
Metadata standard:
CSDGM Version 2 (FGDC-STD-001-1998)

Generated by mp version 2.8.17 on Sun May 21 08:05:48 2006