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1. Public Land Survey System (PLSS) Boundaries: Illinois, 2003

1968. Illinois State Geological Survey. This data set contains Illinois Public Land Survey System (PLSS) boundaries and designations in line and polygon feature classes. THESE DATA HAVE P...

2. PLSS Townships: Illinois, 2003

1968. Illinois State Geological Survey. This dataset contains townships from the Illinois Public Land Survey System in line and polygon form. Line attributes identify state, township and ...

3. PLSS Indian Treaty Boundary Lines: Illinois, 2003

1968. Illinois State Geological Survey. This data set contains Indian Treaty boundary lines from the Illinois Public Land Survey System. The nominal scale is 1:62,500. As of 2003, the dat...

4. State Boundary: Illinois, 2003

1968. Illinois State Geological Survey. This data set contains the Illinois state boundary in line and polygon format. There are two versions of the data included: one that includes the o...

5. Structural Features: Illinois, 1995

1995. Illinois State Geological Survey. This feature dataset is a representation of Plate 1 from ISGS Bulletin 100 (1993) by W. John Nelson. Features depicted are limited to well document...

6. Stack-Unit Mapping of Geologic Materials to a Depth of 15 Meters: Illinois, 2004

1995. Illinois State Geological Survey. This is an SDE polygon feature class containing stack-unit map designations for Illinois. The primary source is ISGS Circular 542, Stack-unit Mappi...

7. Streams and Shorelines: Illinois, 2004

1994. Illinois Department of Natural Resources. This dataset contains data representing streams and shorelines in Illinois and portions of surrounding states as derived from US Geological Survey ...

8. Bedrock Geology: Illinois, 2005

2005. Illinois State Geological Survey. This feature dataset shows the distribution and extent of the bedrock geologic units within the State of Illinois, as depicted on the map Bedrock G...

9. Bedrock Geology of Illinois - Geologic Units, 2004

1996. Illinois State Geological Survey. This feature class shows the distribution and extent of the bedrock geologic units within the State of Illinois, as depicted on the Geologic Map of...

10. Buried Bedrock Surface: Illinois, 2004

1994. Herzog, B.L.. B.J. Stiff, C.A. Chenoweth, K.L. Warner, J.B. Sievering, C. Avery. The Buried Bedrock Surface of Illinois map represents the first revision of the bedrock topography map since the second edition was published by th...

11. County Boundaries: Illinois, 2003

1968. Illinois State Geological Survey. This data set contains Illinois county boundaries in line and polygon formats. The polygon attribute data include county name and number (FIPS) des...

12. Digital Elevation Model (DEM) at 1:250,000: Illinois, 2006

1994. Abert, Curtis C. This raster dataset consists of edge-matched USGS 1:250,000 DEM tiles for Illinois. Cell size is 301 feet and cell values are elevations in meters ...

13. Digital Orthophoto Quadrangle (DOQ) Data: Illinois, 1998 - 2001

1998. U.S. Geological Survey. This is a collection of tile-by-tile NAPP-III DOQs (1998-2001) images in MrSID format for the state of Illinois, in UTM Zones 15 and 16, NAD83. Ort...

14. Driftless Areas: Illinois, 2004

1994. Illinois State Geological Survey. This is a polygon feature class containing driftless areas in Illinois. These areas are analogous to areas of the state where the bedrock surface i...

15. Glacial Drift: Thickness and Character: Illinois, 2004

1994. Illinois State Geological Survey. This is an SDE feature dataset showing drift thickness in Illinois. Data are originally from ISGS Circular 490 by Piskin and Bergstrom (1975), Plat...

16. Historical Aerial Photography: Illinois, 1937-1947

1936. Illinois State Geological Survey. The primary data set consists of historical black and white aerial photographs from Illinois acquired during 1936 to 1941. Alternative years of pho...

17. Major Bedrock Valleys: Illinois, 2004

1994. Illinois State Geological Survey. This feature dataset shows continuous lines representing the lowermost elevations/locations of (buried) bedrock valleys in the state of Illinois. A...

18. Mosaic of Digital Orthophoto Quadrangles in UTM Zone 16, NAD83 Photography: Illinois, 2005

2005. U.S. Geological Survey, Surdex Corporation and Science Applications International Corporation (SAIC), and Illinois State Geological Survey. This data set is an SDE raster mosaic of DOQs from year 2005 that occur within the UTM Zone 16 portion of Illinois. The data are stored in the 'as ...

19. Physiographic Divisions: Illinois, 2004

1993. Illinois State Geological Survey. This is an ESRI feature class showing boundaries for physiographic divisions in Illinois. Data are originally from ISGS Report of Investigations 12...

20. Potential of Agricultural Chemical Contamination of Aquifers, 2004: Illinois

1995. Donald A. Keefer, Illinois State Geological Survey. This is a statewide SDE feature dataset for evaluating the potential for contamination of shallow aquifers by pesticides and nitrate. The sources o...