Mars Viking Geologic Map I-2203 of Maja Valles Pompeii Quad.zip
This map is one in a series of 1:500,000-scale geologic maps initiated by the National Aeronautics and Space Administration to investigate areas of particular scientific interest on Mars. The Pompeii Quadrangle is in northern Maja Valles region between Lunae Planum to the west and Xanthe Terra to the east. Approximately two-thirds of the surface is a relatively smooth plain, and the other one-third is a subdued, cratered, upland plateau. Several large (greater than 30 km in diameter) craters dominate the landscape. The crater Pompeii is the largest fresh crater in the quadrangle. The major interest in the map area is evidence of the relatively brief, catastrophic Maja outflow and its associated topographic modification of much of the area. The effects of erosion and deposition by the Maja flood are pronounced and are a chief part of the story; therefore, flood-modified terrain is divided in considerable detail. The stratigraphic units associated with the outflow are true rock units although they may be very thin. Two major topographic provinces are present in the map area. The Lunae Planum surface is a relatively smooth plain that slopes gently downward to the east; it is interrupted by dominantly north trending wrinkle ridges. Xanthe Terra is a moderately rugged, cratered highland surface that stands higher than Lunae Planum. Xanthe Terra also has a regional downward slope to the northeast toward Chryse Planitia (U.S. Geological Survey). Hence, Xanthe forms a broad revetment between the higher Lunae Planum surface and the lower Chryse Planitia surface. On a regional scale, the east edge of Lunae Planum is modified by crater, streamlined islands, an a broad scour zone of the upper part of the Maja Valles system along the boundary with Xanthe Terra. Xanthe is traversed from northwest to southeast by four minor canyon systems-Bahram Vallis, Vedra Valles, Maumee Valles, and Maja Valles. The Maja system is mostly located immediately south of the quadrangle. Milton (1974) mapped the geology of the Lunae Palus quadrangle at 1:2,000,000 scale using Mariner 9 images that revealed part of the Maja Valles system. Milton's (1974) work called attention the the problem of distinguishing age of surface modification from age of emplacement, a problem that exists on any planet with an active atmosphere. As Viking imagery became available, parts of the quadrangle were included in mapping of the western part of Chryse Planitia by Greeley and others (1977), and most of the area was included in the region discussed by Theilig and Greeley (1979). Baker and Kochel (1979) described the geomorphology of the Maja outflow system and De Hon (1987) likened the extensive trans-Xanthe canyon system to overbank flooding and crevassing in a low-gradient river at flood stage. A regional overview based on Viking imagery is provided in the "Geologic Map of the Western Equatorial Region of Mars" (Scott and Tanaka, 1986).
- Mimetype
- application/zip
- Filename
- Mars-Viking-Geologic-Map-I-2203-of-Maja-Valles-Pompeii-Quad.zip
- Publisher
- USGS Astrogeology Science Center
- Publication Date
- 1 January 2023
- Author
- De Hon, Rene A.
- Originator
- USGS Astrogeology Science Center
- Group
- MRCTR
- Added to Astropedia
- 2 December 2013
- Modified
- 16 June 2021
General
- Purpose
Mars geologic mapping
- Geospatial Data Presentation Form
- Geologic Map
- Series Id
- I-2203
- Edition
- 1
- Online Linkage
- http://astrogeology.usgs.gov/search
- Native Data Set Environment
- ESRI Arcinfo
- Color
- Color
Keywords
- System
- Mars
- Target
- Mars
- Theme
- Geology, Geomorphology, Geographic Information System (GIS), Impact Crater, Hydrology, Water
- Mission
- Viking
- Mission Specific
- Instrument
- VISA, VISB
- Search Terms
- Mars, Geology, Maja Valles, Chryse Planitia
Contact and Distribution
- Access Constraints
- None
- Access Instructions
- You will need GIS software to view included files.
- Use Constraints
- None
Data Status and Quality
- Currentness Reference
- Publication date
- Progress
- Complete
- Update Frequency
- None planned
- Logical Consistency Report
- These data are believed to be logically consistent, though no tests were performed.
- Completeness Report
Maps were completed on Viking-era basemaps.
- Process Description
Map preparation was on mylar or acetate made from USGS negatives. All features were scanned at 50 microns and then vectorized and attributed in Arc/INFO.
- Entity and Attribute Linkage
- http://astrogeology.usgs.gov/rpif
Lineage
- Source Originator
- United States Geological Survey
- Source Publication Date
- 1 January 2023
- Source Title
- Geologic map of the Pompeii Quadrangle (MTM 20057), Maja Valles region of Mars
- Source Online Linkage
- http://astrogeology.usgs.gov/search
- Type of Source Media
- Stable-Base Material
- Attribute Accuracy Report
- Best Effort
Geospatial Information
- Feature Name
- Maja Valles, Pompeii Quadrangle, Chryse Planitia
- Feature Target
- Outflow channels, Maja Valles
- Location Description
- Maja Valles region of Mars
- Minimum Latitude
- 1023837.3222
- Maximum Latitude
- 1344524.156
- Minimum Longitude
- -573549.2958
- Maximum Longitude
- -268325.7001
- Direct Spatial Reference Method
- Vector
- Object Type
- Polygon
- Quad Name
- Control Net
- Viking MDIM1.0
- Map Projection Name
- Transverse Mercator