Metadata:
  Identification_Information:
    Citation:
      Citation_Information:
        Originator: Ponce, D.A.
        Originator: Denton, K.M.
        Originator: Watt, J.T.
        Title: Marine magnetic survey and onshore gravity and magnetic survey, San Pablo Bay, northern California
        Publication_Date: 2016
        Series_Information:
          Series_Name: data release
          Issue_Identification: 2016-XXXX
        Publication_Information:
          Publisher: U.S. Geological Survey
          Publication_Place: Denver, CO
        Online_Linkage: http://pubs.usgs.gov/of/2016/XXXX/
    Description:
      Abstract: Marine magnetic and onshore gravity and magnetic data. From November, 2011 to August, 2015, the U.S. Geological Survey (USGS) collected more than 1,000 line-kilometers of marine magnetic data on San Pablo Bay, 98 onshore gravity stations, and over 27 line-kilometers of ground magnetic data in northern California (fig. 1). Combined magnetic and gravity investigations were undertaken to study subsurface geologic structures as an aid in understanding the geologic framework and earthquake hazard potential in the San Francisco Bay Area. Furthermore, marine magnetic data illuminate local subsurface geologic features in the shallow crust beneath San Pablo Bay where geologic exposure is absent
      Purpose: Dissemination of geophysical survey data. Data can be used to interpret subsurface geologic structures. Magnetic and gravity methods, which reflect contrasting physical properties of the subsurface, are ideal for studying San Pablo Bay. Exposed rock units surrounding San Pablo Bay consist mainly of Jurassic Coast Range ophiolite, Great Valley sequence (GVS), Franciscan Complex rocks, Miocene sedimentary rocks, and unconsolidated alluvium (Graymer and others, 2006). The contrasting magnetic and density properties of these rocks enable us to map their subsurface extent.
    Time_Period_of_Content:
      Time_Period_Information:
        Range_of_Dates/Times:
          Beginning_Date: 20111101
          Ending_Date: 20150801
      Currentness_Reference: Ground condition
    Spatial_Domain:
      Bounding_Coordinates:
        West_Bounding_Coordinate: -122.516617
        East_Bounding_Coordinate: -122.216667
        North_Bounding_Coordinate: 38.166667
        South_Bounding_Coordinate: 37.950000
    Point_of_Contact:
      Contact_Information:
        Contact_Person_Primary:
          Contact_Person: Ponce, D.A.
          Contact_Organization: U.S. Geological Survey, Geology, Energy, Minerals, and Geophysics (GMEG) Science Center
        Contact_Address:
          Address_Type: mailing address
          Address: 345 Middlefield Rd., MS 989
          City: Menlo Park
          State_or_Province: CA
          Postal_Code: 94025
          Country: USA
        Contact_Voice_Telephone: 650-329-5314
        Contact_Electronic_Mail_Address: ponce@usgs.gov
    Status:
      Progress: Complete
      Maintenance_and_Update_Frequency: none planned
    Keywords:
      Place:
        Place_Keyword_Thesaurus: none
        Place_Keyword: San Pablo Bay, northern California
      Theme:
        Theme_Keyword_Thesaurus: none
        Theme_Keyword: Gravity
    Access_Constraints: None
    Use_Constraints: None. Users are advised to read the data set's metadata thoroughly to understand appropriate use and data limitations.
  Data_Quality_Information:
    Attribute_Accuracy:
      Attribute_Accuracy_Report:
        Observed gravity data: 0.05 mGal.
        Gravity anomalies: 0.5 milligal.
    Logical_Consistency_Report: Not applicable.
    Completeness_Report: Data set is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record carefully for additional details. 
    Positional_Accuracy:
      Horizontal_Positional_Accuracy:
        Horizontal_Positional_Accuracy_Report: Submeter.
      Vertical_Positional_Accuracy:
        Vertical_Positional_Accuracy_Report: Submeter.
    Lineage:
      Process_Step:
        Process_Description: Gravity data were processed using standard geophysical methods. 
        Process_Date: 2016
  Spatial_Data_Organization_Information:
    Indirect_Spatial_Reference: San Pablo Bay, CA
  Spatial_Reference_Information:
    Horizontal_Coordinate_System_Definition:
      Geodetic_Model:
        Horizontal_Datum_Name: NAD27
        Ellipsoid_Name: CLARKE 1866
        Semi-major_Axis: 6378206 m
        Denominator_of_Flattening_Ratio: 294.978698214
  Entity_and_Attribute_Information:
    Overview_Description: 
      Entity_and_Attribute_Overview: The entity and attribute information provided here describes the tabular data associated with the data. The structure of the attribute table was generated by the USGS authors of this dataset.
      Entity_and_Attribute_Detail_Citation: The entity and attribute values were generated by the USGS authors of this dataset. 
  Distribution_Information:
    Distributor:
      Contact_Information:
        Contact_Person_Primary:
          Contact_Person: Ponce, D.A.
          Contact_Organization: U.S. Geological Survey
        Contact_Address:
          Address_Type: Mailing and physical address
          Address: 345 Middlefield Rd., MS 989
          City: Menlo Park
          State_or_Province: CA
          Postal_Code: 94025
          Country: USA
        Contact_Voice_Telephone: 650 329-5314
        Contact_Electronic_Mail_Address: ponce@usgs.gov
    Distribution_Liability: Distributor assumes no liability for misuse of data. No warranty expressed or implied is made by the USGS regarding the use of the data on any other system, nor does the act of distribution constitute any such warranty.
  Metadata_Reference_Information: 
    Metadata_Date: 20160823
    Metadata_Contact:
      Contact_Information:
        Contact_Person_Primary:
          Contact_Person: Ponce, D.A.
          Contact_Organization: U.S. Geological Survey
        Contact_Address:
          Address_Type: Mailing and physical address
          Address: 345 Middlefield Rd., MS 989
          City: Menlo Park
          State_or_Province: CA
          Postal_Code: 94025
          Country: USA
        Contact_Voice_Telephone: 650 329-5314
        Contact_Electronic_Mail_Address: ponce@usgs.gov
    Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata
    Metadata_Standard_Version: FGDC-STD-001-1998
    Metadata_Access_Constraints: none
    Metadata_Use_Constraints: none