Heavy minerals from the Palos Verdes margin, southern California: Data and factor analysis

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Frequently anticipated questions:


What does this data set describe?

Title:
Heavy minerals from the Palos Verdes margin, southern California: Data and factor analysis
Abstract:
This metadata file accompanies a report about the results of a study of the heavy minerals in samples collected from beaches and seafloor locations in the Palos Verdes margin, south of the Los Angeles area, California. Samples were collected from 11 beach locations between Hermosa Beach and Point Fermin, California. Box cores were subsampled for 26 offshore samples. MINSPLSMC is an Arcinfo point coverage of the locations of the samples.
  1. How might this data set be cited?
    Wong, Florence L., 2001, Heavy minerals from the Palos Verdes margin, southern California: Data and factor analysis: U.S. Geological Survey Open-File Report 01-153, U.S. Geological Survey, Menlo Park, California.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -118.44776153
    East_Bounding_Coordinate: -118.14746857
    North_Bounding_Coordinate: 33.85690007
    South_Bounding_Coordinate: 33.67032942
  3. What does it look like?
    minspls.gif (GIF)
    location map of Palos Verdes mineral samples
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 1992
    Currentness_Reference:
    Ground Condition
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: map
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
      This is a Point data set. It contains the following vector data types (SDTS terminology):
      • Point (37)
    2. What coordinate system is used to represent geographic features?
      The map projection used is Mercator.
      Projection parameters:
      Standard_Parallel: 33.7
      Longitude_of_Central_Meridian: -118.35
      False_Easting: 0.00000
      False_Northing: 0.00000
      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 2.784026855469
      Ordinates (y-coordinates) are specified to the nearest 2.784026855469
      Planar coordinates are specified in Meters
      The horizontal datum used is nad27.
      The ellipsoid used is Clarke 1866.
      The semi-major axis of the ellipsoid used is 6378206.4.
      The flattening of the ellipsoid used is 1/294.98.
  7. How does the data set describe geographic features?
    Entity_and_Attribute_Overview:
    The sample locations are represented as points as described in the point attribute table MINSPLSMC.PAT
    STATION  numerical station identification, values
      beach samples: 1 2 3 4 5 6 7 8 9 10 11
      F5-92-SC: 102 103 104 108 110 111 116 117 119 121 124 125
      F5-92-SC: 129 132 143 144 147 152 153 160 162 167 173 174 179
      S1-93-SC: 202
    
    LABEL    subsamples; differs from STATION only for beach samples:
      '1b' '2b' '3b' '4b' '5b' '6b' '7b' '8b' '9b' '10b' '11b'
    
    CRUISEID
      PV0992 - beach samples; STATION < 100
      F592SC, S193SC - samples from box cores; STATION > 100
    

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Florence L. Wong
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
    Florence L. Wong
    United States Geological Survey (USGS) Coastal and Marine Geology (CMG)
    Geologist, GIS Coordinator
    USGS, MailStop 999, 345 Middlefield Road
    Menlo Park, CA
    USA

    (650) 329-5327 (voice)
    (650 329-5190 (FAX)
    fwong@usgs.gov

Why was the data set created?

Heavy or high-density minerals in the 63-250-um (micron) size fraction (very fine and fine sand) were analyzed from beach and offshore sites to determine the areal and temporal mineralogic distributions and the relation of those distributions to the deposit affected by effluent discharged from the Los Angeles County Sanitation District sewage system.

How was the data set created?

  1. From what previous works were the data drawn?
    Wong (1994) (source 1 of 1)
    Wong, Florence L., 1994, Heavy-mineral provinces of the Palos Verdes area, southern California, appendix J:.

    This is part of the following larger work.

    Drake, D.E., Sherwood, C.R., and Wiberg, P.L., 1994, Predictive modeling of the natural recovery of the contaminated effluent-affected sediment, Palos Verdes margin, southern California: U.S. Geological Survey, Menlo Park, California.

    Other_Citation_Details: Internal report for the Department of Justice
    Type_of_Source_Media: paper
    Source_Contribution: mineralogy data
  2. How were the data generated, processed, and modified?
    Date: 1992 (process 1 of 3)
    Beach sample locations digitized from 1:24,000-scale topographic map. Offshore sample locations transcribed from ship logs. All locations merged into single Arcinfo point coverage
    Date: 02-May-2001 (process 2 of 3)
    First draft of metadata created by florence using FGDCMETA.AML ver. 1.33 07/15/99 on ARC/INFO data set /we2/florence/arcwork/florence/pvmin/minsplsmc
    Date: 03-May-2001 (process 3 of 3)
    Creation of original metadata record Person who carried out this activity:
    United States Geological Survey (USGS) Coastal and Marine Geology (CMG)
    Attn: Florence L. Wong
    Geologist, GIS Coordinator
    USGS, MailStop 999, 345 Middlefield Road
    Menlo Park, CA
    USA

    (650) 329-5327 (voice)
    (650) 329-5190 (FAX)
    fwong@usgs.gov
  3. What similar or related data should the user be aware of?
    Wong, Florence L., 2001, Heavy-mineral provinces of the Palos Verdes margin, southern California:.

    This is part of the following larger work.

    Lee, Homa, 2001, (Results of PV studies, title pending): Continental Shelf Research.


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?
    Beach samples digitized from locations on 1:24,000-scale topographic map. Offshore locations navigated by GPS and miniranger.
  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 observations, including topology?

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.
  1. Who distributes the data set? (Distributor 1 of 1)
    United States Geological Survey (USGS) Coastal and Marine Geology (CMG)
    Geologist, GIS Coordinator
    USGS, MailStop 999, 345 Middlefield Road
    Menlo Park, CA
    USA

    (650) 329-5327 (voice)
    (650) 329-5190 (FAX)
    fwong@usgs.gov
  2. What's the catalog number I need to order this data set? USGS Open-File Report 01-153
  3. What legal disclaimers am I supposed to read?
    Although these data have been used by the U.S. Geological Survey, U.S. Department of the Interior, no warranty expressed or implied is made by the U.S. Geological Survey as to the accuracy of the data.
    The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of this data, software, or related materials.
  4. How can I download or order the data?

Who wrote the metadata?

Dates:
Last modified: 13-Jun-2016
Metadata author:
Peter N Schweitzer
USGS Midwest Area
Collection manager, USGS Geoscience Data Clearinghouse, http://geo-nsdi.er.usgs.gov/
Mail Stop 954
12201 Sunrise Valley Dr
Reston, VA
USA

703-648-6533 (voice)
703-648-6252 (FAX)
pschweitzer@usgs.gov
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)

This page is <https://geo-nsdi.er.usgs.gov/metadata/open-file/01-153/metadata.faq.html>
Generated by mp version 2.9.48 on Tue Jul 03 20:05:36 2018