For details about a specific data set, see the Contact or Distribution Information in the associated documentation (metadata).
This Clearinghouse is maintained by the Illinois State Geological Survey (ISGS).
Business hours are from 8:00 a.m. to 4:30 p.m. Central Standard Time, Monday through Friday.
For general inquiries associated with this web site, e-mail Sheena Beaverson at beavrsn@isgs.uiuc.edu or call 217/244-9306.