Guide to the Geologic Map of Illinois

"Guide to the Geologic Map of Illinois" by Illinois State Geological Survey is an informational resource that explores the geological landscape of Illinois, focusing on how glaciers shaped the region approximately 15,000 years ago. It uncovers the types of rocks buried beneath glacial deposits and maps out rock layers, offering a glimpse into the structural and economic geology of the state, pinpointing important mineral resources like coal, petroleum, limestone, and dolomite and how they were formed. This guide provides a comprehensive look at Illinois' geological composition, providing historical context and geological survey methods.