Statewide Maps

Surficial Deposits of Illinois
Surficial Deposits of Illinois

Statewide stratigraphic information for Illinois.

Generalized Illinois Geologic Column
Generalized Illinois Geologic Column

This column shows the layers of geologic materials found in Illinois (406 KB).

Illinois Counties
Illinois Counties

The counties of Illinois are shown on this map.

Quaternary (Ice Age) Deposits
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.

Loess Thickness 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.

End Moraines of the Wisconsin Glacial Episode
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. (File size: 494 KB)

Physiographic Divisions of Illinois
Physiographic Divisions of Illinois

A map showing the types of topographic regions of the state.

Satellite Image Map of Illinois
Satellite Image Map of Illinois

A view of the state created from images captured from Earth orbit. 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.

Illinois Surface Topography
Illinois Surface Topography

A computer-generated map showing the elevation of the surface of the state. A 36" × 64" version of this map may be purchased by contacting the ISGS Information Office.

Land Cover Map
Land Cover Map

The Illinois Land Cover map was produced in resonse to the need for current, detailed information about the land, the raw material of Illinois. Such information is essential to ensure wise land-use decisions and good land stewardship.

Drift Thickness Map
Drift Thickness Map

Drift is the sequence of unconsolidated materials that overlies the bedrock throughout most of Illinois.

Coal Industry Map
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.

Bedrock Geology Map of Illinois Page 1
Bedrock Geology Map of Illinois

Title: Bedrock Geology Map of Illinois
Compiled by: Dennis R. Kolata