Geologic Map of The Volcano Ranch Quadrangle, Bernalillo and Sandoval Counties, New Mexico by Ren A. Thompson, Ralph R. Shroba, Christopher Menges, Dwight L. Schmidt, Stephen F. Personius, and Theodore R. Brandt 2009 Scientific Investigations Map 3083 INTRODUCTION Geologic mapping, in support of the USGS Middle Rio Grande Basin Geologic Mapping Project, shows the spatial distribution of surficial deposits, lava flows and related sediments of the Albuquerque volcanoes, upper Santa Fe Group sediments, faults, and fault-related structural features. These deposits are on, along, and beneath the Llano de Albuquerque (West Mesa) west of Albuquerque, New Mexico. Some of these deposits are in the western part of Petroglyph National Monument. Artificial fill deposits are mapped chiefly beneath and near the City of Albuquerque Soil Amendment Facility and the Double Eagle II Airport. Alluvial deposits were mapped in and along stream channels, beneath terrace surfaces, on the Llano de Albuquerque and its adjacent hill slopes. Deposits composed of alluvium and colluvium are also mapped on hill slopes. Wedge-shaped deposits composed chiefly of sandy sheetwash deposits, eolian sand, and intercalated calcic soils have formed on the downthrown-sides of faults. Deposits of active and inactive eolian sand and sandy sheetwash deposits mantle the Llano de Albuquerque. Lava flows and related sediments of the Albuquerque volcanoes were mapped near the southeast corner of the map area. They include eleven mapped young lava flows and, where discernable, associated vent and near-vent pyroclastic deposits associated with cinder cones. Upper Santa Fe Group sediments, are chiefly fluvial in origin, and are well exposed near the western boundary of the map area. From youngest to oldest they include a gravel unit, pebbly sand unit, tan sand and mud unit, tan sand unit, tan sand and clay unit, and silty sand unit. Undivided upper Santa Fe Group sediments are mapped in the eastern part of the map area. Faults were identified on the basis of surface expression determined from field mapping and interpretation of aeromagnetic data where concealed beneath surficial deposits. Fault-related structural features are exposed and mapped near the western boundary of the map area. DISCLAIMERS This database, identified as SIM3083, has been approved for release and publication by the Director of the USGS. Although this database has been subjected to rigorous review and is substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, it is released on condition that neither the USGS nor the United States Government may be held liable for any damages resulting from its authorized or unauthorized use. Although these data have been processed successfully on a computer system at the U.S. Geological Survey, no warranty, expressed or implies is made regarding the display or utility of the data on any other system, or for general or scientific purposes, nor shall the act of distribution constitute such warranty. The U.S. Geological Survey shall not be held liable for improper or incorrect use of the data described and/or contained herein. Any use of trade, product or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Geological Survey. Although this information product, for the most part, is in the public domain, it also contains copyrighted material as noted in the text. Permission to reproduce copyrighted items for other than personal use must be secured from the copyright owner. DATA FILES The database can be downloaded via the Web from http://pubs.usgs.gov/sim/3083/. ArcInfo export files, ArcView shapefiles, and an ArcGIS geodatabase may be extracted from a zip-compressed file (SIM3083_GIS.zip). In addition, an Adobe Portable Document Format (PDF) file (SIM3083.pdf) can be downloaded, from which paper copies may be printed. The database contact is: Theodore R. Brandt 303-236-1901 tbrandt@usgs.gov U.S. Geological Survey Box 25046, Mail Stop 980 Denver, CO 80225 The data were compiled from field mapping. Jim Cole and Mark Hudson, both of the U.S. Geological Survey, reviewed the geologic map. This geospatial database consists of ArcInfo export files (.e00) and ArcView shapefiles contained in a gzipped tar archive or zip archive. Both compressed archive files contain both types of geospatial database files. See the list below. Please refer to the file SIM3083.met for detailed metadata documentation for this geospatial database. List of files: 00ReadMe.txt SIM3083.pdf SIM3083.met volranr.tif volranr.tfw vrhlsd.tif vrhlsd.tfw SIM3083_GIS.zip: e00 directory: vrgeop.e00 vrpnpt.e00 vrwellp.e00 vrhpnmbp.e00 vrhlsd.e00 wpgcmykg.shd.e00 geol_sfo.lin.e00 geoscamp2.mrk.e00 import.aml shapefiles directory: vrgeop.shp (contains polygon attributes for vrgeopl database) vrgeop.shx vrgeop.dbf vrgeop.prj vrgeopl.shp (contains line attributes for vrgeop database) vrgeopl.shx vrgeopl.dbf vrgeopl.prj vrpntp.shp (contains point attributes for vrpntp database) vrpntp.shx vrpntp.dbf vrpntp.prj vrwellp.shp (contains point attributes for vrwellp database) vrwellp.shx vrwellp.dbf vrwellp.prj SIM3083.gdb directory (contains GIS data as geodatabase feature classes) The main product is a Portable Document Format (.pdf) map, which requires Adobe Acrobat for viewing. Acrobat software runs on a variety of systems, and is available for download free of charge from Adobe at http://www.adobe.com.