Prairie Research Institute

Illinois State Geological Survey

Welcome to the Illinois State Geological Survey, part of the Prairie Research Institute at the University of Illinois

The Illinois State Geological Survey (ISGS) supports the environmental quality, economic development, and public safety of Illinois by providing accurate, objective earth science research and information.


ISGS Resources

Looking for ILOIL, ILMINES, ILWATER, or another ISGS resource?
Find maps, publications, applications and geospatial data at
our new Resources site.


From the State Geologist

Have you found a rock, mineral, or fossil that you would like to know more about? Submit your questions and photos to Ask a Geologist!