GEOLOGIC MAP OF BIG BEND NATIONAL PARK, TEXAS By Kenzie J. Turner, Margaret E. Berry, William R. Page, Thomas M. Lehman, Robert G. Bohannon, Robert B. Scott, Daniel P. Miggins, James R. Budahn, Roger W. Cooper, Benjamin J. Drenth, Eric D. Anderson, and Van S. Williams 2011 Scientific Investigations Map 3142 NOTE: The GIS database for this map 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. The database can be downloaded from the USGS server on URL http://pubs.usgs.gov/sim/3142/. In addition, a PDF file of the map may be downloaded, from which paper copies may be printed. The database is presented in ESRI Arc Coverage, Shapefiles, and Geodatabase format. The data were compiled in Arc Coverage format and Geodatabase and Shapefile formats were created directly from the coverages. Feature class names within the Geodatabase and Shapefiles reflect the original coverage names and feature class type. The base map is a composite of 3 quadrangles clipped from the USGS 1:100,000-scale series of quadrangles. The three quadrangles are: Santiago Mountains, Boquillas, and Chisos Mountains quadrangles. The Arc coverages and other files are as follows: Readme file: 00readme.txt Metadata file: bbnp.met Arc Coverage files: bbnp_age.e00 bbnp_att.e00 bbnp_fold.e00 bbnp_geol.e00 bbnp_xsect.e00 Geodatabase file: bbnp.gdb ARC shapefiles: bbnp_age_point.shp (.prj/.sbn/.sbx/.dbf/.shp.xml/.shx) bbnp_fold_arc.shp (.prj/.sbn/.sbx/.dbf/.shp.xml/.shx) bbnp_xsect_arc.shp (.prj/.sbn/.sbx/.dbf/.shp.xml/.shx) bbnp_att_point.shp (.prj/.sbn/.sbx/.dbf/.shp.xml/.shx) bbnp_geol_arc.shp (.prj/.sbn/.sbx/.dbf/.shp.xml/.shx) bbnp_geol_label.shp (.prj/.sbn/.sbx/.dbf/.shp.xml/.shx) bbnp_geol_polygon.shp (.prj/.sbn/.sbx/.dbf/.shp.xml/.shx) Georeferenced raster data: bbnp_chisos_base.tif (.tfw) [Chisos Mountains] bbnp_boq_base.tif (.tfw) [Boquillas] bbnp_sant_base.tif (.tfw) [Santiago Mountains]