Statewide Downloadable Maps

Bedrock Geology Map

This map depicts the bedrock geology of Illinois. View a larger image or download a PDF version of this map. (Large file size: 24.7 MB) A 36" × 54" version of this map, which includes a second sheet showing north-south and east-west cross sections through the State, may be purchased by contacting the ISGS Information Office.

Coal Industry Map

This map shows the extent of Illinois' coal deposits; surface and underground mines, both active and inactive; coal transporation; and major coal-burning utilities. Download a PDF version of this map. (Large file size: 7.2 MB) A 30" × 50" version of this map may be purchased by contacting the ISGS Information Office.

Coal Maps

Link to all downloadable 8.5 x 11-inch size coal maps.

Drift Thickness Map

Drift is the sequence of unconsolidated materials that overlies the bedrock throughout most of Illinois. This map shows the thickness these glacial and postglacial deposits, which include river, beach, wind, and lake water deposits, as well as glacial deposits of the Wisconsin, Illinois, and pre-Illinois episodes. View a larger image or download a page-size PDF version of this map.

Loess Thickness Map

Loess is windblown silt that blankets the surface of large areas of Illinois. This map shows the thickness of loess deposits. View a larger image or download a page-size PDF version of this map.

Illinois Surface Topography

This computer-generated map shows the elevation of the surface of the state. View a larger image or download a page-size PDF version of this map. (Large file size: 1.4 MB) A 36" × 64" version of this map may be purchased by contacting the ISGS Information Office.

Satellite Image Map of Illinois

This view of the state was created from images captured from Earth orbiting satellites. View a larger image or download a PDF version of the map. (Large file size: 12 MB) The original version, a 38" × 52", 1:500,00-scale false-color map created in 1985, may be purchased by contacting the ISGS Information Office.

Physiographic Divisions of Illinois

A map showing the types of topographic regions of the state. View a larger image or download a page-size PDF version of the map (531 KB).

End Moraines of the Wisconsin Glacial Episode

Wisconsin Episode moraines arc across northern Illinois and indicate the temporary stationary positions of the edge of the glacial ice front as the ice receded. View a larger image or download a page-size PDF version of the map (494 KB).

Quaternary (Ice Age) Deposits

This map shows the location of postglacial and late glacial deposits such as river, beach, wind, and lake water deposits as well as other materials deposited during the Wisconsin, Illinois, and pre-Illinois episodes. View a larger image or download a page-size PDF version of the map (631 KB).

Illinois Counties

The counties of Illinois are shown on this map. View a larger image or download a page-size PDF version of the map (342 KB).

Generalized Illinois Geologic Column

This column shows the layers of geologic materials found in Illinois. View a larger image or download a page-size PDF version of the stratigraphic column (406 KB).

Updated 10/6/2009 JKH