GEOLOGIC MAP OF THE CHICKASAW NATIONAL RECREATION AREA, MURRAY COUNTY, OKLAHOMA By Charles D. Blome, David J. Lidke, Ronald R. Wahl, and James A. Golab 2013 Scientific Investigations Map 3258 ABSTRACT This 1:24,000-scale geologic map is a compilation of previous geologic maps and new geologic mapping of areas in and around Chickasaw National Recreation Area. The geologic map includes revisions of numerous unit contacts and faults and a number of previously “undifferentiated” rock units were subdivided in some areas. Numerous circular-shaped hills in and around Chickasaw National Recreation Area are probably the result of karst-related collapse and may represent the erosional remnants of large, exhumed sinkholes. Geospatial registration of existing, smaller scale (1:72,000- and 1:100,000-scale) geologic maps of the area and construction of an accurate Geographic Information System (GIS) database preceded two years of fieldwork wherein previously mapped geology (unit contacts and faults) was verified and new geologic mapping was carried out. The geologic map of Chickasaw National Recreation Area and this pamphlet include information pertaining to how the geologic units and structural features in the map area relate to the formation of the northern Arbuckle Mountains and its Arbuckle-Simpson aquifer. The development of an accurate geospatial GIS database and the use of a handheld computer in the field greatly increased both the accuracy and efficiency in producing the 1:24,000-scale geologic map. DISCLAIMERS 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. Any use of trade, product or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Geological Survey. This database, identified as SIM 3258, 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. DATA FILES List of files: 00ReadMe.txt SIM3258_map.pdf SIM3258.met SIM3258_pamphlet.pdf Datafiles directory Chickasaw.gdb.zip chickasaw_hillshade chickasaw_topo Basemap CNRA_boundary HYdrology Geology Chickasaw_flts Chickasaw_folds Chickasaw_labels Chickasaw_lines Chickasaw_mapboundary Chickasaw_pnts Chickasaw_polys Chickasaw_wells Chickasaw_xsectionA Chickasaw_xsectionB SIM3258_shapefiles.zip directory: chickasaw_flts.shp (dbf/prj/sbn/sbx/shp.xml/shx) chickasaw_folds.shp (dbf/prj/sbn/sbx/shp.xml/shx) chickasaw_labels.shp (dbf/prj/sbn/sbx/shp.xml/shx) chickasaw_lines.shp (dbf/prj/sbn/sbx/shp.xml/shx) chickasaw_mapboundary.shp (dbf/prj/sbn/sbx/shp.xml/shx) chickasaw_pnts.shp (dbf/prj/sbn/sbx/shp.xml/shx) chickasaw_polys.shp (dbf/prj/sbn/sbx/shp.xml/shx) chickasaw_wells.shp (dbf/prj/sbn/sbx/shp.xml/shx) chickasaw_xsectionA.shp (dbf/prj/sbn/sbx/shp.xml/shx) chickasaw_xsectionB.shp (dbf/prj/sbn/sbx/shp.xml/shx) Chickasaw_hillshade.tfw Chickasaw_hillshade.tif Chickasaw_hillshade.rrd Chickasaw_hillshade.aux chickasaw_topo.tfw Chickasaw_topo.tif Chickasaw_topo.rrd Chickasaw_topo.aux HOW TO OBTAIN THE DIGITAL FILES 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://pubs.usgs.gov/sim/3258/ and follow the directions to download the files. The main product is a Portable Document Format (.pdf) map, which requires Adobe Acrobat for viewing, and from which paper copies may be printed. Acrobat software runs on a variety of systems, and is available for download free of charge from Adobe at http://www.adobe.com. ArcReader may be downloaded free of charge from http://www.esri.com/software/arcgis/arcreader/download.htm for viewing additional files included in this report.