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Identification_Information:

  Citation:
    Citation_Information:
      Originator: U.S. Geological Survey (USGS) , Coastal and Marine Geology Program (CMGP) 
      Publication_Date: 20140318
      Title:
        Data of field activity 85034 (F-3A-85-GM) in Gulf Mexico from
        10/02/1985 to 10/22/1985
      Publication_Information:
        Publisher: U.S. Geological Survey (USGS) , Coastal and Marine Geology (CMG) 
        Publication_Place: Menlo Park, CA
      Online_Linkage: http://walrus.wr.usgs.gov/infobank/gos/f-3a-85-gm.fmeta.xml
      Online_Linkage: http://walrus.wr.usgs.gov/infobank/f/f3a85gm/html/f-3a-85-gm.meta.html
      Online_Linkage: http://quashnet.er.usgs.gov/data/1985/85034/index.html

  Description:
    Abstract:
      United States Geological Survey, Woods Hole, Massachusetts.
      Chief Scientists: Dave Twichell, Lindsay Parson. Data
      (sidescansonar, airgun, 3dot5khz, 10khz, magnetics, loranc,
      transitsatellite, gps) of field activity 85034 (F-3A-85-GM)
      in Gulf Mexico from 10/02/1985 to 10/22/1985,
      http://walrus.wr.usgs.gov/infobank/f/f3a85gm/html/f-3a-85-gm.meta.html.

    Purpose:
      These data and information are intended for science
      researchers, students from elementary through
      college, policy makers, and general public.

    Supplemental_Information:

      Equipment Used -

      sidescansonar                 GLORIA long-range side-scan sonar

      airgun                        160 and 80 cu in single-channel seismic-reflection system

      3dot5khz                      3.5 khz bathymetry

      10khz                         10 khz bathymetry

      magnetics

      loranc                        Loran C

      transitsatellite              Satellite receiver

      gps                           Global Positioning System

      Notes -

      NARRATIVE:

        

      Leg 3A was very successful.  The weather was superb and imposed no

      restrictions on the operation of the equipment.  The warm surface water

      temperatures, which imposed such severe restrictions on the line spacing during

      legs 1 and 2, were not as serious a problem during this leg because of the deep

      water depths in which we were working most of the time.  The only area where

      the surface water temperature affected the sonar's range was in the shallow

      water east of the Florida Escarpment, but even here we were able to get

      complete GLORIA coverage to depths of 400-1,000m.  The Loop Current in the

      southeastern corner of the Gulf reached speeds of 7.4 km/hr (4 kts) and was

      highly variable in its direction of flow.  This current made it difficult to

      steer straight lines, and had an effect on the orientation of the GLORIA

      vehicle.  The greatest challenge to operations, though, was fishing boats and

      their long-line fishing gear.  The lines were as long as 65 km (35 nm) and

      were 20 m below the surface; too shallow to go over with GLORIA.  The fishing

      fleet was particularly abundant in the DeSoto Canyon area, but some were

      also found near the edge of the Florida Escarpment at 25dN.  The long-line

      gear is the reason for the peculiarities in the ship's track in these two

      areas.

        

      After the first two days, equipment down time was minimal and operation

      were very smooth.  There were some logging problems with the GLORIA system and

      about 11 hours of data were lost at the beginning of the cruise.  Initially the

      Muirhead camera (part of the system used to play back the data for building

      the at-sea mosaic) was not working properly, but it was fixed and caused only

      a slight delay in building the mosaic.  The preamplifier in the Northstar

      Loran C antenna was damaged when we left Tampa and could not be fixed, but we

      managed very well using a combination of Loran C fixes from the ship's

      receiver, satellite fixes, and fixes from the Global Positioning System when

      available (6-7 hours a day).  The seismic-reflection system was down for about

      9 hours during the entire cruise.  A 160 cu in airgun was used for the first

      three days, and after that we switched to an 80 cu in chamber.  The smaller

      chamber resulted in much less wear on the airgun, yet still provided excellent

      subbottom penetration.

        

      The data from leg 3A were full of surprises.  The Florida Escarpment

      was spectacular, and showed a lot of unexpected changes in morphology along

      its length.  Mass wasting on the slope above the escarpment was more extensive

      than expected, especially south of about 26dN.  The slide or slides on the

      Mississippi Fan that we started mapping on Leg 2 extend to the southeastern

      corner of the Gulf (24dN).  The distal end of the Mississippi Channel was

      found at about 25d30'N-86dW, but it was filled with slide deposits which

      extended much further to the south.

        

      TABULATED INFORMATION:

        

      A.  Days at sea:  20

        

      B.  Amount of data collected:

        

      System			Time Spent		Km Data Collected

        

      GLORIA			424 hr 45 min		6,557

        

      10 kHz profiler		435 hr			6,734

        

      3.5 kHz profiler	435 hr 15 min		6,738

        

      Airgun			428 hr			6,578

        

      Magnetometer		433 hr 30 min		6,712

      Publications -

      Paskevich, Valerie F.; Wong, Florence L.; O'Malley, John J.; Stevenson,

      Andrew J.; Gutmacher, Christina E., 2010, GLORIA sidescan-sonar imagery

      for parts of the U.S. Exclusive Economic Zone and adjacent areas: U.S.

      Geological Survey Open-File Report 2010-1332,

      http://pubs.er.usgs.gov/publication/ofr20101332.

        

      Twichell, David C., and Paskevich, Valerie, 1996, GLORIA sidescan sonar

      field data and navigation data collected in the Gulf of Mexico during

      R/V Farnella cruises in 1982 and 1985: U.S. Geological Survey Open-File

      Report 96-707,

      http://woodshole.er.usgs.gov/publications/of96-707/OPR96_707/INTRO.HTM.


      Similar information is available for thousands
      of other USGS/CMG-related Activities.

      If known, available are Activity-specific
      navigation, gravity, magnetics, bathymetry,
      seismic, and sampling data; track maps; and
      equipment information; as well as summary
      overviews, crew lists, and information
      about analog materials.

      If available, access to physical samples is
      described in the "WR CMG Sample Distribution
      Policy" at:
      http://walrus.wr.usgs.gov/infobank/programs/html/main/sample-dist-policy.html

      Primary access to the USGS/CMG Information
      Bank's digital data, analog data, and
      metadata is provided through...
      http://walrus.wr.usgs.gov/infobank/

      This page accomodates a variety of search
      approaches (e.g., by platform, by region,
      by scientist, by equipment type, etc.).

  Time_Period_of_Content:
    Time_Period_Information:
      Range_of_Dates/Times:
        Beginning_Date: 19851002
        Ending_Date: 19851022

    Currentness_Reference: ground condition

  Status:
    Progress: Complete
    Maintenance_and_Update_Frequency: As needed

  Spatial_Domain:
    Bounding_Coordinates:
      West_Bounding_Coordinate: -88.26970
      East_Bounding_Coordinate: -82.00210
      North_Bounding_Coordinate: 29.21060
      South_Bounding_Coordinate: 23.87920

  Keywords:
    Theme:
      Theme_Keyword_Thesaurus: ISO 19115 Topic Category
      Theme_Keyword: geoscientificinformation
      Theme_Keyword: oceans
    Theme:
      Theme_Keyword_Thesaurus: Global Change Master Directory (GCMD)
      Theme_Keyword: EARTH SCIENCE > OCEANS
    Theme:
      Theme_Keyword_Thesaurus: USGS CMG InfoBank
      Theme_Keyword: Marine Geology

    Place:
      Place_Keyword_Thesaurus: USGS CMG InfoBank
      Place_Keyword: Gulf Coast
      Place_Keyword: Gulf Coast, US
      Place_Keyword: Gulf Mexico
      Place_Keyword: Gulf of Mexico
      Place_Keyword: USA


  Access_Constraints:
    Physical materials are under controlled on-site access.

    If available, access to physical samples is described
    in the "WR CMG Sample Distribution Policy" at:
    http://walrus.wr.usgs.gov/infobank/programs/html/main/sample-dist-policy.html

  Use_Constraints:
    Please recognize the U.S. Geological Survey (USGS) as
    the source of this information.

    Physical materials are under controlled on-site access.

    Some USGS information accessed through this means
    may be preliminary in nature and presented without
    the approval of the Director of the USGS.  This
    information is provided with the understanding
    that it is not guaranteed to be correct or complete
    and conclusions drawn from such information are
    the responsibility of the user.

    This information is not intended for navigational
    purposes.

    Any use of trade, firm, or product names is for
    descriptive purposes only and does not imply
    endorsement by the U.S. Government.

  Point_of_Contact:
    Contact_Information:
      Contact_Organization_Primary:
        Contact_Organization: U.S. Geological Survey (USGS) , Coastal and Marine Geology (CMG) 
        Contact_Person: Clint Steele 

      Contact_Position: InfoBank Group Leader 

      Contact_Address:
        Address_Type: mailing and physical address
        Address: USGS, MailStop 999, 345 Middlefield Road
        City: Menlo Park
        State_or_Province: CA
        Postal_Code: 94025-3561
        Country: USA

      Contact_Voice_Telephone: (650) 329-5055
      Contact_Facsimile_Telephone: (650) 329-5190

      Contact_Electronic_Mail_Address: infobank@octopus.wr.usgs.gov 


  Browse_Graphic:
    Browse_Graphic_File_Name: http://walrus.wr.usgs.gov/infobank/f/f3a85gm/html/f-3a-85-gm.nav.gif
    Browse_Graphic_File_Description: Trackline map of F-3A-85-GM
    Browse_Graphic_File_Type: GIF

  Data_Set_Credit:
    Roy Hadgraft (Captain, J. Marr and Sons);
    Dave Twichell (Chief Scientist, USGS Woods Hole);
    Robert Commeau (Geologist, USGS Woods Hole);
    Steven Mateus (Geologist, USGS Woods Hole);
    Page Valentine (Geologist Data Curator, USGS Woods Hole);
    Charlie Paull (Geologist, Scripps Institute of Oceanography);
    Kim Benjamin (Engineer, Woods Hole Oceanographic Institution);
    Derek Bishop (GLORIA Engineer, IOS (Institute of Oceanographic Sciences, U.K.));
    Lindsay Parson (Co-chief Scientist, IOS);
    Robin Bonner (Airgun Tech, IOS);
    Jon Campbell (GLORIA Engineer, IOS);
    Andrew Harris (GLORIA Engineer, IOS);
    Colin Jacobs (Geologist, IOS);
    Doriel Jones (Shipboard Computing, RVS (Research Vessel Services, U.K.));
    Derek Lewis (Shipboard Computing, RVS)

  Native_Data_Set_Environment: Digital, ASCII
  Cross_Reference:
    Citation_Information:
      Originator: U.S. Geological Survey (USGS) , Coastal and Marine Geology (CMG) 
      Publication_Date: Unknown
      Title: USGS/CMG Information Bank 
      Publication_Information:
        Publisher: U.S. Geological Survey (USGS)  Coastal and Marine Geology (CMG) 
        Publication_Place: Menlo Park, CA
      Online_Linkage: http://walrus.wr.usgs.gov/infobank/
      Online_Linkage: http://quashnet.er.usgs.gov/data/1985/85034/index.html
      Other_Citation_Details:
        Paskevich, Valerie F.; Wong, Florence L.; O'Malley, John J.; Stevenson,
        Andrew J.; Gutmacher, Christina E., 2010, GLORIA sidescan-sonar imagery
        for parts of the U.S. Exclusive Economic Zone and adjacent areas: U.S.
        Geological Survey Open-File Report 2010-1332,
        http://pubs.er.usgs.gov/publication/ofr20101332.
          
        Twichell, David C., and Paskevich, Valerie, 1996, GLORIA sidescan sonar
        field data and navigation data collected in the Gulf of Mexico during
        R/V Farnella cruises in 1982 and 1985: U.S. Geological Survey Open-File
        Report 96-707,
        http://woodshole.er.usgs.gov/publications/of96-707/OPR96_707/INTRO.HTM.



Data_Quality_Information:

  Attribute_Accuracy:
    Attribute_Accuracy_Report: Identified as best available version.

  Logical_Consistency_Report: Unspecified

  Completeness_Report:
    Start and end date/times of data
    >Navigation Data (f-3a-85-gm.060 [GPS])
    >YYYYMMDDHHMMSST    YYYYMMDDHHMMSST
    >198510031400000    198510111310000
    >198510111422000    198510211936000
    >YYYYMMDDHHMMSST    YYYYMMDDHHMMSST

  Positional_Accuracy:
    Horizontal_Positional_Accuracy:
      Horizontal_Positional_Accuracy_Report: Unspecified

    Vertical_Positional_Accuracy:
      Vertical_Positional_Accuracy_Report: Unspecified

  Lineage:

    Process_Step:
      Process_Description:
        Navigation Data
        >/infobank/f/f3a85gm/nav/f-3a-85-gm.060
        >time/lat/long style, multi-record, in caps, without tabs
        >temporal-spatial data
        >copied and reformatted from Navigation Data R/V Farnella 85, Leg 3 in:
        >Twichell, David C., and Paskevich, Valerie, 1996, GLORIA sidescan sonar field data
        >and navigation data collected in the Gulf of Mexico during R/V Farnella cruises
        >in 1982 and 1985: U.S. Geological Survey Open-File Report 96-707,
        >http://woodshole.er.usgs.gov/publications/of96-707/OPR96_707/INTRO.HTM.
        > - C Degnan, 3/17/2014
        >       1         2         3
        >3456789012345678901234567890123456
        >
      Process_Date: 20140318

      Process_Contact:
        Contact_Information:
          Contact_Organization_Primary:
            Contact_Organization: U.S. Geological Survey (USGS) , Coastal and Marine Geology (CMG) 
            Contact_Person: Clint Steele 

          Contact_Position: InfoBank Group Leader 

          Contact_Address:
            Address_Type: mailing and physical address
            Address: USGS, MailStop 999, 345 Middlefield Road
            City: Menlo Park
            State_or_Province: CA
            Postal_Code: 94025-3561
            Country: USA

          Contact_Voice_Telephone: (650) 329-5055
          Contact_Facsimile_Telephone: (650) 329-5190

          Contact_Electronic_Mail_Address: infobank@octopus.wr.usgs.gov 


Spatial_Data_Organization_Information:

  Indirect_Spatial_Reference: Gulf Mexico
  Direct_Spatial_Reference_Method: Point

  Point_and_Vector_Object_Information:
    SDTS_Terms_Description:
      SDTS_Point_and_Vector_Object_Type: Point


Spatial_Reference_Information:

  Horizontal_Coordinate_System_Definition:
    Geographic:
      Latitude_Resolution: 0.00001
      Longitude_Resolution: 0.00001
      Geographic_Coordinate_Units: Decimal degrees

  Vertical_Coordinate_System_Definition:
    Depth_System_Definition:
      Depth_Datum_Name: Local surface
      Depth_Resolution: 0.1
      Depth_Distance_Units: meters
      Depth_Encoding_Method: Attribute values


Entity_and_Attribute_Information:

  Overview_Description:
    Entity_and_Attribute_Overview: Navigation with Time Stamp 


Distribution_Information:

  Distributor:
    Contact_Information:
      Contact_Organization_Primary:
        Contact_Organization: U.S. Geological Survey (USGS) , Coastal and Marine Geology (CMG) 
        Contact_Person: Clint Steele 

      Contact_Position: InfoBank Group Leader 

      Contact_Address:
        Address_Type: mailing and physical address
        Address: USGS, MailStop 999, 345 Middlefield Road
        City: Menlo Park
        State_or_Province: CA
        Postal_Code: 94025-3561
        Country: USA

      Contact_Voice_Telephone: (650) 329-5055
      Contact_Facsimile_Telephone: (650) 329-5190

      Contact_Electronic_Mail_Address: infobank@octopus.wr.usgs.gov 

  Resource_Description: Downloadable Data 85034 (F-3A-85-GM) data set 

  Distribution_Liability:
    Please recognize the U.S. Geological Survey (USGS) as
    the source of this information.

    Physical materials are under controlled on-site access.

    Some USGS information accessed through this means
    may be preliminary in nature and presented without
    the approval of the Director of the USGS.  This
    information is provided with the understanding
    that it is not guaranteed to be correct or complete
    and conclusions drawn from such information are
    the responsibility of the user.

    This information is not intended for navigational
    purposes.

    Any use of trade, firm, or product names is for
    descriptive purposes only and does not imply
    endorsement by the U.S. Government.

  Standard_Order_Process:
    Digital_Form:
      Digital_Transfer_Information:
        Format_Name: ASCII
        File_Decompression_Technique: No compression applied
        Transfer_Size: 0.8

      Digital_Transfer_Option:
        Online_Option:
          Computer_Contact_Information:
            Network_Address:
              Network_Resource_Name: http://walrus.wr.usgs.gov/infobank/f/f3a85gm/html/f-3a-85-gm.nav.html

    Fees: None


Metadata_Reference_Information:

  Metadata_Date: 20140318

  Metadata_Contact:
    Contact_Information:
      Contact_Organization_Primary:
        Contact_Organization: U.S. Geological Survey (USGS) , Coastal and Marine Geology (CMG) 
        Contact_Person: Clint Steele 

      Contact_Position: InfoBank Group Leader 

      Contact_Address:
        Address_Type: mailing and physical address
        Address: USGS, MailStop 999, 345 Middlefield Road
        City: Menlo Park
        State_or_Province: CA
        Postal_Code: 94025-3561
        Country: USA

      Contact_Voice_Telephone: (650) 329-5055
      Contact_Facsimile_Telephone: (650) 329-5190

      Contact_Electronic_Mail_Address: infobank@octopus.wr.usgs.gov 

  Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata 

  Metadata_Standard_Version: FGDC-STD-001-1998 

  Metadata_Time_Convention: universal time
  Metadata_Access_Constraints: none
  Metadata_Use_Constraints: none



      
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