Map PDF PDF of Geologic Road Map of Illinois: Surface Deposits and Landscapes Front PDF of Geologic Road Map of Illinois: Surface Deposits and Landscapes Back General Information: Description One 36" x 36" folded map. Features surface deposits and landforms, municipalities, parks and recreational areas, and roads. Publication Details: Publication Date 2001 Authors David A. Grimley Barbara J. Stiff Michael J. Andrew Map Details: Series ID IMAP 10 Scale Category Statewide Scale 1:760,320
