Prairie Research Institute Illinois State Geological Survey 615 East Peabody Drive GEOLOGICAL AND GEOPHYSICAL MAPS OF THE ILLINOIS BASIN–OZARK DOME REGION Champaign, Illinois 61820-6918 (217) 244-2414 http://www.isgs.illinois.edu MAP 10: MAGNETIC ANOMALY Digitally compiled by Curtis C. Abert, Stephen Marshak, and Timothy H. Larson 2016 90° 89° 88° Data Source 90° 0' 0" W Raster cell size is approximately 1,026 meters. Data were extracted from the fol- lowing source: 40° 0' 0" N STATES Bankey, V., A. Cuevas, D. Daniels, C.A. Finn, I. Hernandez, P. Hill, R. Kucks, W. 1 Missouri 42° 42° Miles, M. Pilkington, C. Roberts, W. Roest, V. Rystrom, S. Shearer, S. Snyder, 2 3 2 Illinois 3 Indiana 85° R. Sweeney, J. Velez, J.D. Phillips, and D. Ravat, 2002, Digital data grids for 1 4 86° 4 Kentucky Chicago! the magnetic anomaly map of North America: Denver, Colorado, U.S. Geo- 87° logical Survey, Open-File Report 02-414, http://mrdata.usgs.gov/geophysics/ aeromag.html (accessed September 9, 2015). 91° Magnetic Anomaly Nanotesla (nT) 400 200 41° 150 41° 100 90 95° 94° 70 93° 92° 50 30 20 10 0 40° Ϫ10 40° Ϫ20 Ϫ30 Ϫ40 ! Indianapolis Ϫ60 Ϫ80 Ϫ100 Ϫ125 95° Ϫ175 Ϫ200 Ϫ300 ! Kansas City 39° 39° 84° 83° St. Louis! Louisville ! 38° 38° 82° 82° 37° 37° 83° 85° 84° 87° 86° 94° 93° 92° 91° 89° 88° 36° 36° 90° 1: 1,500,000 Vector base data from 2009 Esri Data and Maps Digital cartography by Curtis C. Abert and Jennifer E. Carrell, Illinois State Geologi- Geographic coordinate system: GCS_WGS_1984 cal Survey. Projection: Lambert Conformal Conic The Illinois State Geological Survey, the University of Illinois, and the State of Il- Recommended citation: linois make no guarantee, expressed or implied, regarding the correctness of the Abert, C.C., S. Marshak, and T.H. Larson, 2016, Map 10: Magnetic anom- interpretations presented in this document and accept no liability for the conse- © 2016 University of Illinois Board of Trustees. All rights reserved. aly, in S. Marshak, T.H. Larson, and C.C. Abert, compilers, Geologi- quences of decisions made by others on the basis of the information presented cal and geophysical maps of the Illinois Basin–Ozark Dome Region: For permission information, contact the Illinois State Geological Survey. here. The geologic interpretations are based on data that may vary with respect to Illinois State Geological Survey, Illinois Map 23-10, 1:1,500,000. the accuracy of geographic location, the type and quantity of data available at each location, and the scientific and technical qualifications of the data sources. Illinois Map 23-10.