Created in 1905, the ISGS provides scientific information to government, business, and the public. Our research and service programs encompass geologic mapping, water and mineral resources, environmental and engineering geology, geochemistry, and education.

The Illinois State Climatologist web site offers data and information on various aspects of the climate of Illinois: temperature, precipitation, snowfall, average conditions and climate extremes.

The plants and animals found in concretions recovered from the Francis Creek Shale are some of the most exciting and important fossils that have been found in the state of Illinois. These fossils are known as the Mazon Creek fossils, because they were originally found along Mazon Creek in northeastern Illinois. ...