Recently Added Maps

Recently Added Maps for Download

54" × 40" sheet, includes map, legend, 2 figures, and descriptive text.  Map is available for download only. This map has not been reviewed by the Illinois State Geological Survey and does not necessarily conform to the usual style and standards for ISGS publications Updated: January 6, 2021
Big Rock Surficial EDMAP
45" × 26" map sheet; includes map and legend, 3 cross sections, descriptive text and figure; map is available for download only. This map has not been reviewed by the Illinois State Geological Survey and does not necessarily conform to the usual style and standards for ISGS publications.  For mor Updated: December 23, 2020
Surficial Geology of Keyesport, Illinois
Two 36" × 30" map sheets and one 10-page report; sheet 1 contains map and legends; sheets 2 includes 4 cross sections and 4 figures; report contains descriptive text, 1 figure, and 1 table. Updated: December 23, 2020
Surficial Geology of Williamson County, Illinois, map thumbnail, sheet 1
Two 35.5" × 32" map sheets and one 11-page report; sheet 1 contains map and legends; sheets 2 includes 3 cross sections and 4 figures; report contains descriptive text, 1 figure, and 1 table Updated: December 23, 2020
Surficial Geology of Steger Quadrangle, Will and Cook Counties, Illinois, map thumbnail, sheet 1
Two 35" x 30" map sheets; sheet 1 contains map and legends; sheet 2 includes 2 cross sections and 6 figures, including bedrock s Updated: December 23, 2020
Surficial geology of Crossville Quadrangle, map thumbnail, sheet 1
Two 35" x 30" map sheets; sheet 1 contains map and legends; sheet 2 includes 2 cross sections, 1 bedrock surface topography map, and 1 unconsolidated sediment thickness map, A brief report is also included on the second map sheet. Updated: December 23, 2020
Bedrock Geology of Williamson County, map thumbnail, sheet 1
One 36" x 30" map sheet which contains map and legends. A 63 page report includes sections on stratigraphy, structural geology, economic geology, references, appendix, 23 figures, 4 tables, and 1 plate. Updated: December 23, 2020
Bedrock Geology of Franklin Grove Quadrangle, map thumbnail, sheet 1
Two 35" x 30" map sheets; sheet 1 contains map, legends and 1 figure; sheet 2 includes stratigraphic column, unit descriptions, and 1 cross section. A 24 page report includes stratigraphy, paleontology, sedimentology, structural geology, economic resources, references, 9 figures and 3 plates. Updated: December 23, 2020
Bedrock Geology of Davenport East and Milan Quadrangles, map thumbnail, sheet 1
40" x 30" and 35" x 30" map sheets; sheet 1 contains map, legends and 1 figure; sheet 2 includes stratigraphic column, unit descriptions, 2 cross sections, and report. Updated: December 23, 2020