Part I: Lithology of the offshore San Diego area; Part II: Foraminifera, Coronado Bank and vicinity, California

Metadata also available as - [Outline] - [Parseable text] - [XML]

Frequently-anticipated questions:

What does this data set describe?

Title:
Part I: Lithology of the offshore San Diego area; Part II: Foraminifera, Coronado Bank and vicinity, California
Abstract:
"The lithology of the land and island areas adjacent to the San Diego area are reviewed briefly. The geology of Los Coronados Islands is presented in more detail than formerly and the importance of faulting is shown. A total of 418 rock samples collected in the offshore San Diego area have been examined and classified lithologically. The rocks have been subdivided into three classifications on the basis of rounding and composition: 1.) rocks essentially in place, 2) transported rocks, and 3) authigenic rocks. Charts of the 3 lithologic classifications are presented. The rocks essentially in place and the transported rocks occupy two belts: 1.) Coronado Bank - Coronado Escarpment and 2) Pt. Loma - Tia Juana River. Cretaceous rocks are exposed off Pt. Loma; and Late Pliocene to Pleistocene, on Coronado Bank. These may be correlatives of the 'Chico' and San Diego formations, respectively. The transported rocks are derived from distant sources for the most part, but a small portion is derived from the outcrop areas. The authigenic rock is phosphorite which is almost confined to Coronado Bank. The age of the formation of the major portion of the phosphorite is believed to be post-Late Pliocene and pre-last glacial. The physiography of the area is dominated by the Coronado Escarpment, a probable fault scarp. North of the Los Coronados Islands, Loma Sea Valley and Coronado Canyon mark other faults. Los Coronados Islands are probably tilted fault blocks."
Supplemental_Information:
Funded by the Office of Naval Research (N6-ori-111, Task 6). Data digitized by the USGS for inclusion into usSEABED (<http://walrus.wr.usgs.gov/usseabed>)
  1. How should this data set be cited?

    Butcher, William S. , 1951, Part I: Lithology of the offshore San Diego area; Part II: Foraminifera, Coronado Bank and vicinity, California: University of California, Los Angeles.

    Other_Citation_Details:
    PhD. dissertation. Parts included in Submarine Geology off San Diego, California, by K.O. Emery, W.S. Butcher, H.R. Gould, and F.P. Shepard, Journal of Geology v. 60, number 6, pp. 551-548.

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -117.48333
    East_Bounding_Coordinate: -117.15500
    North_Bounding_Coordinate: 32.74833
    South_Bounding_Coordinate: 32.31833

  3. What does it look like?

    Butcher_PhD_51 (.jpg)
    Sample distribution with coastline and bathymetry for reference.

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

    Calendar_Date: 1951
    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):

      • Entity point (418)

    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 0.03167. Longitudes are given to the nearest 0.05500. 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 code

    Water depth
    Water depth (Source: Source report)

    Range of values
    Minimum:506
    Maximum:1570
    Units:Meters
    Resolution:1.0

    Lithologic description
    Sample descriptions (Source: Source report)

    Written text including shape, number of specimens, maximum size (in centimeters), and lithology.

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?

    William S. Butcher at the University of California, Los Angeles for the collection and analysis of data. For inclusion into usSEABED: Digitization: Jane Reid (USGS); Formatting corrections: Jane Reid (USGS) and Chris Jenkins (University of Colorado).

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

    University of California
    Department of Earth and Space Sciences
    Los Angeles, CA 90095-1567

    310-825-2779 (voice)
    info@ess.ucla.edu

Why was the data set created?

The study of the lithology of the offshore San Diego area has been undertaken with the purpose of determining the areas of bedrock outcrops, their lithology, and the geologic age. A further purpose of this study is to determine, in so far as possible, the structure of the area. The transported rocks are studied to determine their composition and origin. The authigenic rock, phosphorite, is studied to determine the age and mode of formation in this area.

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)
    No information is given on the processing of the samples. Only simple descriptions are included in the report.

    Person who carried out this activity:

    University of California
    Department of Earth and Space Sciences
    Los Angeles, CA 90095-1567

    310-825-2779 (voice)
    info@ess.ucla.edu

    Data sources produced in this process:
    • Butcher_PhD_1951

  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?

    Navigational technique not given in paper. Positions given to degrees minutes, tenths. Dredge samples have start and end positions; in usSEABED, point locations for dredged samples are taken at midpoints.

  3. How accurate are the heights or depths?

    Depth determination technique not given in paper. Depths given in fathoms.

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

    All data in Appendix A were digitized; Heavy mineral analyses (unlocated) and foraminiferal identification were not digitized.

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

    Data are consistent.

How can someone get a copy of the data set?

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

Access_Constraints: None. Report is available at libraries.
Use_Constraints: Cite William S. Butcher and UCLA as originator of the data.

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

    University of California
    Department of Earth and Space Sciences
    Los Angeles, CA 90095-1567

    310-825-2779 (voice)
    info@ess.ucla.edu

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

    Butcher PhD 1951.

  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.

  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 Tue May 16 20:26:28 2006