510 ILCS 77/10.24
Current through Public Acts 103-1 through 103-587, 103-589, and 103-590
"Karst area" means an area with a land surface containing sinkholes, large springs, disrupted land drainage, and underground drainage systems associated with karstified carbonate bedrock and caves or a land surface without these features but containing a karstified carbonate bedrock unit generally overlain by less than 60 feet of unconsolidated materials.
510 ILCS 77/10.24