Onshore and Offshore Geologic Map of the Coal Oil Point Area, Southern California

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Frequently anticipated questions:

What does this data set describe?

Title:
Onshore and Offshore Geologic Map of the Coal Oil Point Area, Southern California
Abstract:
This report presents a digital geologic map of merged onshore and offshore geology near the Coal Oil Point area in the northern Santa Barbara Channel, southern California at a compilation scale of 1:24,000 (one inch on the map to 2,000 feet on the ground). The map depicts the distribution of bedrock units, surficial deposits, and associated deformation underlying onshore and offshore regions. The report also presents ESRI shapefile format data including geologic polygons, contacts, folds, and point features used to create the seamless onshore-offshore geologic map.
Supplemental_Information:
Information for the related USGS Coastal and Marine Geology data collection field activity, Z-2-06-SC, is online at <http://walrus.wr.usgs.gov/infobank/z/z206sc/html/z-2-06-sc.meta.html>

  1. How should this data set be cited?

    United States Geological Survey (USGS), 2010, Onshore and Offshore Geologic Map of the Coal Oil Point Area, Southern California:.

    Online Links:

    This is part of the following larger work.

    Dartnell, Peter, Conrad, James, Stanley, Richard, and Cochrane, Guy, 2010, Onshore and Offshore Geologic Map of the Coal Oil Point Area, Southern California: Data Series 3124, U.S. Geological Survey, Coastal and Marine Geology Program, Western Coastal and Marine Geology, Menlo Park, CA.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -120.0000000
    East_Bounding_Coordinate: -119.5000000
    North_Bounding_Coordinate: 34.50000000
    South_Bounding_Coordinate: 34.25000000

  3. What does it look like?

    none (none)
    none

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

    Beginning_Date: 2006
    Ending_Date: 2010
    Currentness_Reference: ground condition

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

    Geospatial_Data_Presentation_Form: Vector

  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):

      • Label point

    2. What coordinate system is used to represent geographic features?

      Grid_Coordinate_System_Name: Universal Transverse Mercator
      Universal_Transverse_Mercator:
      UTM_Zone_Number: 11
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: 0.9996
      Longitude_of_Central_Meridian: -117.00000
      Latitude_of_Projection_Origin: 0.00000
      False_Easting: 500000.0
      False_Northing: 0.00

      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 10.0
      Ordinates (y-coordinates) are specified to the nearest 10.0
      Planar coordinates are specified in Meters

      The horizontal datum used is NAD83.
      The semi-major axis of the ellipsoid used is 6378137.00 meters.
      The flattening of the ellipsoid used is 1/0.003352811.

  7. How does the data set describe geographic features?

    Entity_and_Attribute_Overview:

    The data are supplied in ESRI shapefile format.
    geopt.shp: Contains points recording site-specific observations and measurements, such as strike and dip of bedding. In the sbpnt.pat INFO file, the PTTYPE item lists the type of point symbol, e.g., strike and dip of inclined bedding. The STRIKE item contains the strike of bedding as well as trend of fold axis, where applicable. Strike is an azimuthal angle. Measured in degrees from 0 to 360 in a clockwise direction from North, the STRIKE value also specifies the dip direction, where the dip direction is 90 degrees clockwise relative to the STRIKE. The DIP item contains the dip of bedding as well as plunge angles, where applicable. This value is an angle measured (in degrees 0 to 90) down from the horizontal; thus, a horizontal dip is 0 degrees and a vertical dip is 90 degrees.

    The DBF structure of the shapefile is listed below: 
    
geopt.dbf:

COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME
     1  AREA                   8    18     F      5
     9  PERIMETER              8    18     F      5
    17  SBPNT#                 4     5     B      -
    21  SBPNT-ID               4     5     B      -
    25  PTTYPE               100   100     C      -
   125  SYMBOL                 3     3     I      -
   128  STRIKE                 3     3     I      -
   131  DIP                    3     3     I      -
   134  SOURCE                 4     4     I      -
   138  SENSCODE               4     4     I      -
   142  SLIPSENS              80    80     C      -
   222  CERTCODE               3     3     I      -
   225  SENCERT               80    80     C      -


Coding of PTTYPE in the geopt shapefile:
Arrow showing direction of fold plunge
Contact attitude - Showing strike and dip
Fault attitude - Showing strike and dip
Horizontal bedding
Inclined bedding - Showing approximate strike and dip
Inclined bedding - Showing strike and dip
Inclined bedding - Strike and dip of beds calculated from bedding trace
Oil seep
Overturned bedding - Showing strike and dip
Qas - Asphalt deposits
Qtc – Travertine and/or caliche deposits
Slip lineation on a fault - Showing bearing and rake
Vertical bedding - Showing strike
    Entity_and_Attribute_Detail_Citation:
    <http://www.esri.com/library/whitepapers/pdfs/shapefile.pdf>

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?

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

    Jamie Conrad
    U.S. Geological Survey, Coastal and Marine Geology
    Geologist
    345 Middlefield Rd MS-999
    Menlo Park, CA 94025-3561
    USA

    (650) 329-5402 (voice)
    (650) 329-5411 (FAX)
    jconrad@usgs.gov

Why was the data set created?

These data are intended for science researchers, students, policy makers, and the general public. The data can be used with geographic information systems (GIS) or other software to display the geologic information and the merged topography and bathymetry digital terrain model.

How was the data set created?

  1. From what previous works were the data drawn?

    SIM-09-3001 (source 1 of 1)
    Minor, S.A., Kellogg, K.S., Stanley, R.G., Gurrola, L.D., Keller, E.A., and Brandt, T.R., 2009, Geologic map of the Santa Barbara coastal plain area, Santa Barbara County, California: U.S. Geological Survey Scientific Investigations Map 3001.

    Other_Citation_Details:
    scale 1:24,000, online at: <http://pubs.er.usgs.gov/usgspubs/sim/sim3001>
    Type_of_Source_Media: online
    Source_Scale_Denominator: 24000
    Source_Contribution: provided initial contact features on a geologic map

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

    Date: 2009 (process 1 of 1)
    Offshore geology was mapped by interpreting multibeam bathymetry and acoustic backscatter data, seismic profiles, sea floor photographs, and sediment samples. Heads up screen digitization of geologic polygons, geologic contacts, and folds was done over geo-referenced imagery at 1:24,000 scale in Adobe Illustrator software. The Illustrator map was imported into a GIS (Arcmap) and merged with onshore geologic polygons, contacts, and folds from Minor et al., 2009, available at <http://pubs.er.usgs.gov/usgspubs/sim/sim3001>. The onshore geology was reprojected to UTM, zone 11, NAD83 projection to match the offshore geology. Overlapping polygons along the coast, mainly beach deposits (QB), were cleaned.

    Person who carried out this activity:

    Peter Dartnell
    U.S. Geological Survey, Coastal and Marine Geology
    Physical Scientist
    345 Middlefield Rd MS-999
    Menlo Park, CA 94025-3561
    USA

    (650) 329-5460 (voice)
    (650) 329-5411 (FAX)
    pdartnell@usgs.gov

  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?

  2. How accurate are the geographic locations?

    Heads up screen digitization of geologic point features was done over geo-referenced imagery at 1:24,000 scale. Offshore point features were merged with onshore point features from Minor et al., 2009

  3. How accurate are the heights or depths?

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

    Complete

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

    Unspecified

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:

Please recognize the U.S. Geological Survey (USGS)

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

    U.S. Geological Survey, Information Services
    345 Middlefield Rd MS-532
    Menlo Park, CA 94025-3561
    USA

    (650) 329-4309 (voice)

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

  3. What legal disclaimers am I supposed to read?


    These data not intended for navigational purposes.
    Although these data have been used by the U.S. Geological Survey, U.S. Department of the Interior, these data and information are provided with the understanding that they are not guaranteed to be usable, timely, accurate, or complete. Users are cautioned to consider carefully the provisional nature of these data and information before using them for decisions that concern personal or public safety or the conduct of business that involves substantial monetary or operational consequences. Conclusions drawn from, or actions undertaken on the basis of, such data and information are the sole responsibility of the user.

    Neither the U.S. Government nor any agency thereof, nor any of their employees, contractors, or subcontractors, make any warranty, express or implied, nor assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any data, software, information, apparatus, product, or process disclosed, nor represent that its use would not infringe on privately owned rights.

    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: 15-Apr-2010
Metadata author:
Peter Dartnell
U.S. Geological Survey, Coastal and Marine Geology
Physical Scientist
345 Middlefield Rd MS-999
Menlo Park, CA 94025-3561
USA

(650) 329-5460 (voice)
(650) 329-5411 (FAX)
pdartnell@usgs.gov

Metadata standard:
Content Standard for Digital Geospatial Metadata ("CSDGM version 2") (FGDC-STD-001-1998)

Generated by mp version 2.9.13 on Thu Dec 9 12:53:06 2010