James M. Dohm Kenneth L. Tanaka James A. Skinner, Jr. TBD vector digital data http://pubs.usgs.gov/sim/3158/ The Metis Mons quadrangle (V-6) is in the northern hemisphere of Venus and extends from 50 to 75 degrees north latitude and from 240 to 300 degrees east longitude. The Magellan mission to Venus acquired synthetic aperture radar (SAR) backscatter, emissivity, reflectance, and topographic data for most of the planet. Image mosaics of radar backscatter were the primary data set used to delineate the boundaries of discrete geologic units and characterize their appearance, morphology, and distribution. We have identified a total of 27 geologic units in the Metis Mons map region based on morphologic characteristics, geologic associations, and stratigraphic relations. These can be subdivided into five major material groups: mons materials, plains materials, corona materials, tessera material, and crater materials. The main purpose of this map is to reconstruct the geologic history of the Metis Mons quadrangle at a level of detail commensurate with a scale of 1:5,000,000 using Magellan data. We interpret four partly overlapping stages of geologic activity, which collectively resulted in the formation of tesserae, coronae (oriented along structure belts), plains materials of varying ages, and four large volcanic constructs. Scattered impact craters, small shields and pancake-shaped domes, and isolated flows superpose the tectonically deformed materials and appear to be the most youthful materials in the map region. The overall geologic sequence in the V-6 quadrangle represents a lowlands style of resurfacing and tectonism that demonstrates broad magmatic and tectonic evolution recorded in tessera and plains materials, as well as local evolution of coronae and large shield volcanoes. TBD publication date Complete None planned 240.00 300.00 75.0 50.0 NASA Geologic Map Venus corona ridge and fracture belt impact crater tessera volcanic plains Magellan data Venus Metis Mons Kawelu Planitia Libuse Planitia Guinevere Planitia Bachue Corona Feronia Corona Otau Corona Azham Corona Coatlicue Corona Rananeida Corona Demeter Corona Bau Corona Bagbartu Mons Mokosha Mons Arita Mons Ben Dorsa Okipeta Dorsa Varma-Ava Dorsa Chykh-Keyok Dorsa Hemera Dorsa Iyele Dorsa Ilbis Fossae Minerva Fossae Lampedo Linea Atropos Tessera Senectus Tessera Virilis Tessera Ale Tholus Upunusa Tholus Nerthus Tholus Utrenitsa Vallis Gazatteer of Planetary Nomenclature (http://planetarynames.wr.usgs.gov) None None U.S. Geological Survey mailing address

2255 North Gemini Drive

Flagstaff AZ 86001 United States of America ktanaka@usgs.gov U. S. Geological Survey. Prepared for the National Aeronautics and Space Administration. Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.3.1.1850 All attributes created during the geologic mapping process were verified by displaying lines in both the database and the spatial coverage. Attributes are believed to be logically consistent, commensurate with a scale of 1:5,000,000 scale using Magellan radar data. These data are believed to be logically consistent, commensurate with a scale of 1:5,000,000 scale using Magellan radar data. Line geometry is topologically clean. The final map was generalized and scaled to be commensurate with a 1:5,000,000 map scale, although map component compilation was at a larger scale. Map scale and base materials dictates that the locational accuracy of the geologic linework is no better than 5 km. In places, due to the nature of geologic mapping on radar basemaps, some geologic features likely have positional errors significantly greater than 5 kms. Overall, the geologic map product is only as accurate as the original Magellan basemap produced by the USGS. For more information regarding original basemap accuracy see http://www2.jpl.nasa.gov/magellan/. Pettengill, Gordon H.; Peter G. Ford, William T. K. Johnson, R. Keith Raney,Laurence A. Soderblom (1991). "Magellan: Radar Performance and Data Products". Science (American Association for the Advacement of Science) 252 (5003): 260-265. U.S. Geological Survey Pettengill, Gordon H.; Peter G. Ford, William T. K. Johnson, R. Keith Raney,Laurence A. Soderblom (1991). "Magellan: Radar Performance and Data Products". Science (American Association for the Advacement of Science) 252 (5003): 260-265. http://www.jstor.org/stable/2875683 Dohm identified preliminary map units by hand using 1:1,000,000 scale hard-copy basemaps overlain by Mylar. Mylar maps were digitized using a drum scanner and merged in GIS. Skinner edited, cleaned, and (where necessary) moved linework to the 1:5,000,000 scale digital basemap in the project GIS. Dohm, Tanaka, and Skinner iterated on the digitized linework by adding and deleting contacts and units where necessary to best represent the mapped geologic characteristics. Skinner finalized completed features in GIS and prepared the map package for external review by G. McGill and A. Brian. Skinner implemented editorial comments and suggested changes by reviewers. 1998-2011 Vector String 1759 G-polygon 629 String 5292 String 7767 Entity point 678 G-polygon 1 G-polygon 50 G-polygon 5 G-polygon 630 Lambert Conformal Conic 34.000000 73.000000 -90.000000 0.000000 0.000000 0.000000 coordinate pair 0.000100 0.000100 meters <custom> <custom> 6051000.000000 infinity 0.000100 Explicit elevation coordinate included with horizontal coordinates Final geologic contact polyline feature class. Contains a TYPE field denoting the type of geologic contact.Final geologic contact polyline feature class. Contains a TYPE field denoting the type of geologic contact. GeoContacts Final geologic unit polygon feature class. Contains a Sph_Area field containing the area of each polygon, as calculated using the spheroid. Contains a UName field denoting the unit name. Contains a USym field denoting the unit symbol. GeoUnits Final structural and morphologic polyline feature class. Contains a TYPE field denoting the type of linear feature. LinearFeatures Final locational feature point feature class. Contains a TYPE field denoting the type of locational feature. LocationFeatures Quadrangle boundary as polygon feature class. MapBoundary Merged unit polygon feature class. Contains a UnitGroup field denoting the grouping as depicted in Figures 1A and 1B of the geologic map. UnitGroups_COMU 5 x 5 degree reference graticule as polyline feature class. Graticule Annotation feature class showing the location and extent of approved planetary nomenclature for features located wholly or partly within the quadrangle boundary. Nomenclature U.S. Geological Survey mailing address

Box 25286 Federal Center

Denver CO 80225 United States of America http://ww.usgs.gov/pubprod or 1-888-ASK-USGS (1-888-275-8784) Downloadable Data 20110412 U.S. Geological Survey, Astrogeology Science Center James A. Skinner, Jr. Geologist mailing and physical address

2255 North Gemini Drive

Flagstaff AZ 86001 Unites States of America 928-556-7000 jskinner@usgs.gov FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 local time http://www.esri.com/metadata/esriprof80.html ESRI Metadata Profile