Metadata:
  Identification_Information:
    Citation:
      Citation_Information: Burr, D.M., Jacobsen, R.E., Lefort, A., Borden, R.M., and Peel, S.E., 2021, Geologic Map of the Aeolis Dorsa region, Mars: U.S. Geological Survey Scientific Investigations Map 3480, 1 sheet, scale 1:500,000, pamphlet 11 p., https://doi.org/10.3133/sim3480.
        Originator: Devon Burr, Northern Arizona University, Professor, Astronomy and Planetary Science Department
        Publication_Date: 2021
        Title: Geologic Map of the Aeolis Dorsa Region, Mars
        Geospatial_Data_Presentation_Form: vector digital data
        Series_Information:
          Series_Name: SIM
          Issue_Identification: 3480
    Description:
      Abstract: The Aeolis Dorsa region comprises most of the westernmost and stratigraphically lowest part of the Medusae Fossae Formation, the Aeolis Dorsa region and contains evidence for all significant dichotomy processes (fluvial, aeolian, tectonic, and volcanic), which provide an extensive and multifaceted geologic record consistent with the extensive age duration of the region. The Aeolis Dorsa themselves have been interpreted to be inverted fluvial deposits. The low stratigraphic position of these deposits and the time required for their formation indicate a most likely formation age of Late Noachian to Early Hesperian, consistent with the age of fluvial units elsewhere on Mars. The superposed deposits modified by extensive aeolian scour likely represent processes that occurred during the Amazonian Period. Thus, we suggest the Aeolis Dorsa region contains geologic units that represent the global transition from the wetter Noachian to the more arid Amazonian. This paleoclimatic transition is reflected in the regional geomorphology.
      Purpose: 1:500,000-scale geologic map of Aeolis Dorsa, Mars.
    Status:
      Progress: Complete
    Spatial_Domain:
      Bounding_Coordinates:
        West_Bounding_Coordinate: 147.5
        East_Bounding_Coordinate: 156.0
        North_Bounding_Coordinate: 0.0
        South_Bounding_Coordinate: -8.0
    Keywords:
      Theme:
        Theme_Keyword_Thesaurus: None
        Theme_Keyword: Mars
        Theme_Keyword: Aeolis Dorsa
        Theme_Keyword: Geology
        Theme_Keyword: Planetary Science
        Theme_Keyword: CTX
    Access_Constraints: None
    Use_Constraints: GIS software is required to view these data.
    Data_Set_Credit: Devon Burr
    Native_Data_Set_Environment: Version 6.2 (Build 9200); Esri ArcGIS 10.7.1.11595
  Spatial_Data_Organization_Information:
    Direct_Spatial_Reference_Method: Vector
    Point_and_Vector_Object_Information:
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        Point_and_Vector_Object_Count: 19677
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        Point_and_Vector_Object_Count: 1180
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        Point_and_Vector_Object_Count: 1051
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  Spatial_Reference_Information:
    Horizontal_Coordinate_System_Definition:
      Planar:
        Map_Projection:
          Map_Projection_Name: Mars2000 Equidistant Cylindrical clon0
          Equirectangular:
            Standard_Parallel: 0.0
            Longitude_of_Central_Meridian: 0.0
            False_Easting: 0.0
            False_Northing: 0.0
        Planar_Coordinate_Information:
          Planar_Coordinate_Encoding_Method: coordinate pair
          Coordinate_Representation:
            Abscissa_Resolution: 0.0001
            Ordinate_Resolution: 0.0001
          Planar_Distance_Units: meter
      Geodetic_Model:
        Horizontal_Datum_Name: D Mars 2000 Sphere
        Ellipsoid_Name: Mars 2000 Sphere IAU IAG
        Semi-major_Axis: 3396190.0
        Denominator_of_Flattening_Ratio: 0.0
  Metadata_Reference_Information:
    Metadata_Date: 20200306
    Metadata_Contact:
      Contact_Information:
        Contact_Organization_Primary:
          Contact_Organization: USGS Astrogeology Science Center
          Contact_Person: Marc Hunter
        Contact_Position: IT Specialist (Applications Software)
        Contact_Address:
          Address_Type: mailing and physical
          Address: 2255 N. Gemini Dr
          City: Flagstaff
          State_or_Province: AZ
          Postal_Code: 86001
          Country: US
        Contact_Electronic_Mail_Address: mahunter@usgs.gov
    Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata
    Metadata_Standard_Version: FGDC-STD-001-1998
    Metadata_Time_Convention: local time