Geologic map of the Rio Rico and Nogales 7.5' quadrangles, Santa Cruz County, Arizona by William R. Page, Christopher M. Menges, Floyd Gray, Margaret E. Berry, Mark W. Bultman, Michael A. Cosca, and D. Paco VanSistine 2016 Scientific Investigations Map 3354 ABSTRACT: The Rio Rico and Nogales (Arizona) 1:24,000-scale quadrangles are located in the Basin and Range province of southern Arizona, and the southern edge of the map is the international border with Sonora, Mexico. The major urban area is Nogales, a binational city known as “the gateway to Mexico.” Rocks exposed in the map area range in age from Jurassic through Quaternary. Major physiographic, geologic, and hydrologic features in the map area include the southern San Cayetano Mountains, Grosvenor Hills, and Sonoita Creek in the northern part, and Mount Benedict and the Mount Benedict horst block in the south-central part. The horst block is bounded by the Santa Cruz River on the east and Nogales Wash on the west. The objectives of our mapping were to define the geologic framework for the Nogales area and the upper Santa Cruz basin to support ongoing multidisciplinary projects. This new work will improve understanding of the Nogales Formation to more fully assess its groundwater resource potential. We significantly revised the Miocene Nogales Formation based on geologic mapping combined with new geochronologic, geophysical, and petrographic studies. DISCLAIMERS: This database, identified as SIM3354, 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 implied 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. government. 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 contact is: Paco VanSistine 303-236-5452 dvansistine@usgs.gov U.S. Geological Survey Mail Stop 980 Denver, CO 80225 Initial steps in compilation of the geologic map dataset included preliminary compilation of the geology of late Miocene to early Pleistocene basin fill and Quaternary alluvium by Margaret E. Berry. William R. Page then integrated the geology of the Nogales Formation and bedrock units with basin-fill and Quaternary alluvium digital compilation. Final step was completed by Christopher Menges who revised the original basin fill and Qaternary alluvium units, subdividing and defining more detailed geology of those units. This geospatial database consists of ArcInfo export files (.e00), ArcView shapefiles, and ArcGIS geodatabase files contained in a zip archive. See the list below. Please refer to the file SIM3354.met for detailed metadata documentation for this geospatial database. List of files: 00ReadMe.txt SIM3354_pamphlet.pdf SIM3354_sheet1.pdf SIM3354_sheet2.pdf SIM3354_sheet1_geo.pdf (georeferenced pdf for users' convenience) SIM3354.met SIM3354_appendix.xlsx shapefiles directory: riorico_nogales_fold.shp (.dbf/.prj/.sbn/.sbx/.shx.xml/.shx) line riorico_nogales_geochron.shp (.dbf/.prj/.sbn/.sbx/.shx.xml/.shx) point riorico_nogales_line.shp (.dbf/.prj/.sbn/.sbx/.shx.xml/.shx) line riorico_nogales_pnt.shp (.dbf/.prj/.sbn/.sbx/.shx.xml/.shx) point riorico_nogales_poly.shp (.dbf/.prj/.sbn/.sbx/.shx.xml/.shx) polygon riorico_nogales_sections.shp (.dbf/.prj/.sbn/.sbx/.shx.xml/.shx) line basemaps directory: rrnog_hs.tif (.tfw/.tif.aux.xml/.tif.ovr) rrnog_topo.tif (.tfw/.tif.aux.xml/.tif.ovr/.tif.vat.cpg/.tif.vat.dbf) SIM3354_GIS.gdb directory (contains GIS data as geodatabase feature classes) HOW TO OBTAIN THE DIGITAL FILES: ArcInfo export files, ArcView shapefiles, and an ArcGIS geodatabase may be extracted from a zip-compressed file (SIM3354_GIS.zip). In addition, an Adobe Portable Document Format (PDF) file (SIM3354 _map.pdf) can be downloaded, from which paper copies may be printed. The digital files constituting the geologic map database of this report can be obtained via the Internet from the U.S. Geological Survey publications website. Go to the web page at http://dx.doi.org/10.3133/sim3354 and follow the directions to download the files. 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. To open *.xlsx files, a free Microsoft Excel viewer can be found here: https://www.microsoft.com/en-us/download/details.aspx?id=10 ArcReader may be downloaded free of charge from http://www.esri.com/software/arcgis/arcreader/ for viewing additional files included in this report.