Map 4: Bedrock Geology
Geologic data were compiled and generalized from the following sources: 
<br/>Dean, C.S., 2002, State geology series: Lexington, Kentucky Geological Survey,
http://www.uky.edu/KGS/gis/geology.htm, accessed August 5, 2015.
<br/>Gray, H.H., C.H. Ault, and S.J. Keller, compilers, 1987, Bedrock geologic
map of Indiana: Bloomington, Indiana Geological Survey, Miscellaneous
Map 48, 1:500,000.
<br/>Indiana Geological Survey, 2010, BEDROCK_GEOL_MM48_IN: Bedrock
Geology of Indiana: Bloomington, Indiana Geological Survey, scale
1:500,000, polygon shapefile, maps.indiana.edu/metadata/Geology/Bedrock_
Geology.html, accessed August 5, 2015.
<br/>Kolata, D., compiler, 2005, Bedrock geology of Illinois: Illinois State Geological
Survey, Illinois Map Series 14, 1:500,000, GISDB_BEDGEO.IL_
Bedrock_ Geology_500K_2005, GIS database, http://www.isgs.illinois.
edu/ nsdihome/webdocs/st-geolb.html (accessed September 9, 2015).
<br/>McDowell, R.C., G.J. Grabowski, and S.L. Moore, 1981, Geologic map of
Kentucky: U.S. Geological Survey, 1:250,000.
<br/>Missouri Department of Natural Resources, Division of Geology and Land
Survey, Missouri Geological Survey, 1979, Geologic Map of Missouri:
Jefferson City, Missouri Geological Survey, ftp://msdis.missouri.edu/pub/
state/st_geol.e00.gz, (accessed August 2012).
<br/>Noger, M.C., compiler, 1988, Geologic map of Kentucky: Lexington, Kentucky
Geological Survey, 1:500,000.
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