Map PDF PDF of Surficial Geology of Lake County, Illinois and adjoining areas General Information: Description Two 38" x 35" map sheets; sheet 1 contains map and legends; sheet 2 includes descriptive text and cross sections. Publication Details: Publication Date 2015 Authors Michael L. Barnhardt Andrew J. Stumpf Jason F. Thomason Steven E. Brown Contributors Barbara J. Stiff Jennifer E. Carrell Jane E. Johnshoy Domier Donald E. Luman Dawn V. Heckman Virgie J. Amacher Map Details: Program STATEMAP Theme Surficial Geology Scale Category County Scale 1:62,500
