A Study of Marine Terrigenous Sediments from the Gulf of Mexico (Allan T. Mullins Thesis)

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Frequently-anticipated questions:

What does this data set describe?

Title:
A Study of Marine Terrigenous Sediments from the Gulf of Mexico (Allan T. Mullins Thesis)
Abstract:
An area of 45 square miles was sampled south of St. George Island in the Gulf of Mexico with a total of 38 samples being obtained. This area has an undulatins bottom due to a series of ridges and troughs trending approximately east and west across it. Differences were found in the terrigenous sediments taken from the ridges when compared with those obtained from the troughs on either side of them. These sediments on the ridges had a smaller median grain size and better sorting than the material in the adjacent troughs or lows. The CaCO3 percentage was also lower in those locations. However, the terrigenous sediment on the ridges was not found to be statistically different from that found in the troughs for the area as a whole. Fourteen varieties of heavy minerals were identified in the area. The suite present is indicative of a high rank metamorphic source area. Two authigenic varieties were found. The data from the present area were compared statistically using the median test with the previously examined eastern area of Dog Island. This eastern area has an even profile typical of off-bar areas. The median grain size or the terrigenous sediments was found to be significantly different at the 5 percent level between the two areas with the eastern area having coarser material. Obvious differences between the two areas are the presence of heavy minerals in measureable amounts in the area off St. George Island as opposed to only a trace off Dog Island; and the presence of bed rock in the eastern area whereas none was found in the western area.
  1. How should this data set be cited?

    Jenkins, Christopher J. , 2002, A Study of Marine Terrigenous Sediments from the Gulf of Mexico (Allan T. Mullins Thesis).

    Online Links:

    Other_Citation_Details:
    Geology Department, Forida State University, Tallahassee, FL 32306

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -85.0635
    East_Bounding_Coordinate: -84.9754
    North_Bounding_Coordinate: 29.5992
    South_Bounding_Coordinate: 29.4155

  3. What does it look like?

    Mullins1959.jpg
    Image showing geographic extent of data layer coverage

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

    Calendar_Date: 1959
    Currentness_Reference: publication date

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

    Geospatial_Data_Presentation_Form: document

  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):

      • Entity point (38)

    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 0.0000. Longitudes are given to the nearest 0.0000. Latitude and longitude values are specified in Decimal degrees.

      The horizontal datum used is North American Datum of 1927.
      The ellipsoid used is Clarke 1866.
      The semi-major axis of the ellipsoid used is 6378206.400000.
      The flattening of the ellipsoid used is 1/294.978698.

  7. How does the data set describe geographic features?

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?

    Please review the cross reference information for the original data set credit to Mullins (1959), and Chris Jenkins for digitizing samples locations and entering the data from the source report.

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

    Chris Jenkins
    Institute of Arctic & Alpine Research (INSTAAR) University of Colorado at Boulder
    1560 30th Street
    Boulder, CO 80309-0450
    USA

    (303) 492-6387 (voice)
    (303) 492-6388 (FAX)
    chris.jenkins@colorado.edu

Why was the data set created?

The purpose of this data layer is to create a digital version of the sedimentary characteristics published by Mullins (1959) for inclusion in the usSEABED data collection.

How was the data set created?

  1. From what previous works were the data drawn?

  2. How were the data generated, processed, and modified?

    (process 1 of 1)
    Digital data were hand formatted into dbSEABED data entry structure, then filtered and data-mined through dbSEABED software (version: db9_MNEx.bas)

    Person who carried out this activity:

    Chris Jenkins
    Institute of Arctic & Alpine Research (INSTAAR) University of Colorado at Boulder
    1560 30th Street
    Boulder, CO 80309-0450
    USA

    (303) 492-6387 (voice)
    (303) 492-6388 (FAX)

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

    Mullins, Allan T. , 1959, A Study of Marine Terrigenous Sediments from the Gulf of Mexico: Forida State University, Tallahassee, Forida.

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

  1. How well have the observations been checked?

    All attributes were entered and checked in a consistent manner.

  2. How accurate are the geographic locations?

    Navigational accuracy is unknown.

  3. How accurate are the heights or depths?

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

    Sedimentary descriptions and locations are provided for 38 samples.

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

    No additional check for topological consistency were performed on this data.

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:
None except that acknowledgement must be made in publications and reports of (i) the original data source, and (ii) the data integration by USGS and dbSEABED project at the University of Colorado.

  1. Who distributes the data set?[Distributor contact information not provided.]

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

    Mullins, 1959

  3. What legal disclaimers am I supposed to read?

    Although this data set has been used by the U.S. Geological Survey (USGS), no warranty, expressed or implied, is made by the USGS as to the accuracy of the data and/or related materials. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of these data or related materials. Trade, firm, or product names and other references to non-USGS products and services are provided for information only and do not constitute endorsement or warranty, express or implied, by the USGS, USDOI, or U.S. Government, as to their suitability, content, usefulness, functioning, completeness, or accuracy.

  4. How can I download or order the data?

Who wrote the metadata?

Dates:
Last modified: 22-Mar-2006
Metadata author:
U.S. Geological Survey
c/o Brian J. Buczkowski
Core Curator and Data Management Specialist
384 Woods Hole Road
Woods Hole, MA 02543-1598
USA

(508) 548-8700 x2361 (voice)
(508) 457-2310 (FAX)
bbuczkowski@usgs.gov

Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)
Metadata extensions used:

Generated by mp version 2.8.24 on Mon Mar 27 19:56:00 2006