8.5 x 11 Inch Maps and Geologic Column

Drift Thickness Map

This map shows the drift thickness in Illinois.

Loess Thickness Map

This map shows the loess thickness in Illinois

Illinois Surface Topography

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

Satellite Image Map of Illinois

A view of the state created from images captured from Earth orbit. View a larger image or download a PDF version of the map (Large file size: 12 MB). The original version, a 38" x 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 PDF version of the map (531 KB).

End Moraines of the Wisconsin Glacial Episode

Wisconsin Episode moraines arc across northern Illinois and indicate the position of temporary stationary ice fronts as the ice retreated. View a larger image or download a PDF version of the map (494 KB).

Ice Age (Quaternary) Deposits in Illinois

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 in the Wisconsin, Illinois, and pre-Illinois episodes. View a larger image or download a PDF version of the map (631 KB).

Illinois Counties

This map shows the location of counties in the state. View a larger image or download a 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 PDF version of the stratigraphic column (406 KB).