Identification_Information: Citation: Citation_Information: Originator: Rossman P. Irwin, III, Smithsonian Institution, National Air and Space Museum, Geologist Publication_Date: 20131216 Title: Geologic Map of MTM -15027, -20027, -25027, and -25032 Quadrangles, Margaritifer Terra Region of Mars Edition: 1 Geospatial_Data_Presentation_Form: vector digital data Series_Information: Series_Name: Scientific Investigations Map Issue_Identification: 3209 Description: Abstract: Mars Transverse Mercator (MTM) quadrangles -15027, -20027, -25027, and -25032 (lat 12.5-28 S., long 330-335 E. and lat 22.5-28 S., long 324.5-330 E.) in southwestern Margaritifer Terra include diverse erosional landforms, sedimentary deposits, and tectonic structures that record a long geologic and geomorphic history. The northeastern regional slope of the pre-Noachian crustal dichotomy (as expressed along the Chryse trough) and structures of the informally named Middle Noachian or older Holden and Ladon impact basins dominate the topography of the map area. A series of mesoscale outflow channels, Uzboi, Ladon, and Morava Valles, integrated these formerly enclosed basins by overflow and incision around the Noachian/Hesperian transition, although some flooding may have occurred earlier. The area includes excellent examples of Late Noachian to Hesperian valley networks, dissected crater rims, alluvial fans, deltas, and light-toned layered deposits (LTLDs), particularly in Holden and Eberswalde craters. Structural forms include Tharsis-radial grabens, Hesperian wrinkle ridges, floor-fractured impact craters, and severely disrupted chaotic terrains. These well-preserved landforms and sedimentary deposits represent multiple erosional epochs and discrete flooding events, which provide significant insight into the geomorphic processes and climate change on early Mars. Purpose: Investigation of fluvial landforms and other surface modifications in a map area containing two high-priority rover landing sites. Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 20100601 Ending_Date: 20131216 Currentness_Reference: Bounds are in a positive East longitude system. Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -39.042431 East_Bounding_Coordinate: -19.980428 North_Bounding_Coordinate: -9.999991 South_Bounding_Coordinate: -30.213008 Keywords: Theme: Theme_Keyword_Thesaurus: NASA Glossary Theme_Keyword: Geologic, Mars, structure, Noachian, Hesperian, Amazonian, photogeologic, mapping Place: Place_Keyword_Thesaurus: Gazetteer of Planetary Nomenclature Place_Keyword: Mars, Margaritifer Terra, Holden, Ladon, Eberswalde Temporal: Temporal_Keyword_Thesaurus: None Temporal_Keyword: Noachian, Hesperian, Amazonian Access_Constraints: None Use_Constraints: None Point_of_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: Smithsonian Institution, National Air and Space Museum Contact_Person: Rossman P. Irwin, III Contact_Position: Geologist Contact_Address: Address_Type: mailing and physical Address: MRC 315, Independence Ave at 6th St, SW City: Washington State_or_Province: DC Postal_Code: 20560 Country: US Contact_Voice_Telephone: 202-633-3632 Contact_Electronic_Mail_Address: irwinr@si.edu Point_of_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: Smithsonian Institution, National Air and Space Museum Contact_Person: John A. Grant Contact_Position: Geologist Contact_Address: Address_Type: mailing and physical Address: MRC 315, Independence Ave at 6th St, SW City: Washington State_or_Province: DC Postal_Code: 20560 Country: US Contact_Voice_Telephone: 202-633-2474 Contact_Electronic_Mail_Address: grantj@si.edu Data_Set_Credit: Irwin, Rossman P., III, and John A. Grant, 2013, Geologic Map of MTM -15027, -20027, -25027, and -25032 Quadrangles, Margaritifer Terra Region of Mars, U.S. Geological Survey Scientific Investigations Map 3209, scale 1:1,000,000. Available at http://pubs.usgs.gov/sim/3209/ Security_Information: Security_Classification_System: None Security_Classification: Unclassified Security_Handling_Description: N/A Native_Data_Set_Environment: Esri ArcGIS 9.3 Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: All attributes were verified by displaying the lines in both the database and the spatial coverage and they are believed to be logically consistent. Logical_Consistency_Report: Data is good to 1:1M scale. The base map used for mapping was 231 meters per pixel. Completeness_Report: These data are believed to be logically consistent. Line geometry is topologically clean. Lineage: Process_Step: Process_Description: Detailed mapping was based on THEMIS visible images at 18 m/pixel and Mars Reconnaissance Orbiter (MRO) Context Camera images at 5 m/pixel. Where available, Mars Orbiter Camera (MOC) images at ~2-5 m/pixel, MRO High Resolution Imaging Science Experiment (HiRISE) visible images at 25 cm/pixel, and Compact Reconnaissance Imaging Spectrometer for Mars (CRISM) products facilitated local interpretations of within-unit 2 stratigraphy. Topographic measurements were based on the 128 pixel/degree MOLA Mission Experiment Gridded Data Record. Using ArcGIS 9.3, we drafted line work at 1:250,000 scale for publication at 1:1,000,000 scale. Unit contacts have a stream-digitized vertex spacing of ~500 m and are attributed as definite or approximate. Linear features include faults, crater rims, and small valleys. Process_Date: 20100701 Process_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: Smithsonian Institution, National Air and Space Museum Contact_Person: Rossman P. Irwin, III Contact_Position: Geologist Contact_Address: Address_Type: mailing and physical Address: MRC 315, Independence Ave at 6th St, SW City: Washington State_or_Province: DC Postal_Code: 20560 Country: US Contact_Voice_Telephone: 202-633-3632 Contact_Electronic_Mail_Address: irwinr@si.edu Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Vector Point_and_Vector_Object_Information: SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: Entity point Point_and_Vector_Object_Count: 46 SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: String Point_and_Vector_Object_Count: 629 SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: Entity point Point_and_Vector_Object_Count: 163 SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains Point_and_Vector_Object_Count: 160 SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: String Point_and_Vector_Object_Count: 4 SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: String Point_and_Vector_Object_Count: 1829 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Map_Projection: Map_Projection_Name: Mars Holden Transverse_Mercator: Scale_Factor_at_Central_Meridian: 1.0 Longitude_of_Central_Meridian: -30.0 Latitude_of_Projection_Origin: 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 Ellipsoid_Name: Mars 2000 IAU IAG Semi-major_Axis: 3396190.0 Denominator_of_Flattening_Ratio: 169.8944472236118 Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: U. S. Geological Survey Contact_Person: USGS Publications Contact_Address: Address_Type: mailing Address: Box 25286, Federal Center City: Denver State_or_Province: CO Postal_Code: 80225-0046 Country: US Contact_Voice_Telephone: 1-888-ASK-USGS Contact_Electronic_Mail_Address: usgsstore@usgs.gov Distribution_Liability: None Standard_Order_Process: Digital_Form: Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://pubs.usgs.gov/sim/3209/ Ordering_Instructions: Download digital map Available_Time_Period: Time_Period_Information: Single_Date/Time: Calendar_Date: 20131216 Metadata_Reference_Information: Metadata_Date: 20131213 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: USGS Contact_Person: Trent Hare Contact_Position: Cartographer Contact_Address: Address_Type: mailing and physical Address: 2255 North Gemini Drive City: Flagstaff State_or_Province: AZ Postal_Code: 86001 Country: US Contact_Voice_Telephone: 928-556-7100 Contact_Electronic_Mail_Address: thare@usgs.gov Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998 Metadata_Time_Convention: local time Metadata_Use_Constraints: None