Statewide stratigraphic information for Illinois.
This column shows the layers of geologic materials found in Illinois (406 KB).
The counties of Illinois are shown on this map.
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 is windblown silt that blankets the surface of large areas of Illinois. This map shows the thickness of loess deposits.
Wisconsin Episode moraines arc across northern Illinois and indicate the position of temporary stationary ice fronts as the ice retreated. (File size: 494 KB)
A map showing the types of topographic regions of the state.
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.
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.
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 is the sequence of unconsolidated materials that overlies the bedrock throughout most of Illinois.
This map shows the extent of Illinois' coal deposits; surface and underground mines, both active and inactive; coal transporation; and major coal-burning utilities.