County mapping is carried out at the ISGS under a variety of programs. The programs exist for different purposes and require different levels of scientific review. Maps are published in specific Series based on the program under which they were created and the corresponding level of review.

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Displaying 1 - 10 of 86
Map Images Title Description Theme Series County Publication Date Authors
3-D Visualization of Bedrock Resources in Lake County Page 1 3-D Visualization of Bedrock Resources in Lake County Page 2 3-D Visualization of Bedrock Resources in Lake County, Illinois

1:62,500 Lake County map atlas (2 sheets)

 Three-dimensional Model Open File Series (OFS) Lake 2003 Hannes E. Leetaru
Aquifer Sensitivity Map of Tazewell County Aquifer Sensitivity Map of Tazewell County, Illinois

1:62,500 Tazewell County map; 50" x 36" single map sheet; includes map, legend, and inset maps (3)

 Aquifer Sensitivity Open File Series (OFS) Tazewell 2003 Patrick D. Johnstone
Aquifer Sensitivity Map, Jo Daviess County Aquifer Sensitivity Map, Jo Daviess County, Illinois

1:62,500 Jo Daviess County map; 59" x 30" single map sheet; includes map, legend, and 3 inset maps

 Aquifer Sensitivity Open File Series (OFS) Jo Daviess 2000 Christopher S. McGarry, Matthew H. Riggs
Aquifer Sensitivity of Carroll County Aquifer Sensitivity of Carroll County, Illinois

1:62,500 Carroll County map; 53" x 29" single map sheet; includes map, legend, and 3 inset maps

 Aquifer Sensitivity Open File Series (OFS) Carroll 1997 Christopher S. McGarry, David A. Grimley
Aquifer Sensitivity to Contamination, Kane County Aquifer Sensitivity to Contamination, Kane County, Illinois

One 27" x 33" map sheet; includes map, legends and descriptive text

 Aquifer Sensitivity Illinois County Geologic Map Series (ICGM) Kane 2007 William S. Dey, Alec M. Davis, B. Brandon Curry
Bedrock Geology Map, Jo Daviess County Bedrock Geology Map, Jo Daviess County, Illinois

1:62,500 Jo Daviess County map; 49" x 29" single map sheet; includes map, legend, and descriptive text

 Bedrock Geology Open File Series (OFS) Jo Daviess 2000 Christopher S. McGarry
Bedrock Geology of Boone and Winnebago Counties Sheet 1 Bedrock Geology of Boone and Winnebago Counties, Illinois

1:100,000 Boone and Winnebago Counties area map; 33" x 36" single map sheet; includes map, legend and inset map

 Bedrock Geology Open File Series (OFS) Boone, Winnebago 2000 Christopher S. McGarry
Bedrock Geology of Carroll County Bedrock Geology of Carroll County, Illinois

1:62,500 Carroll County map; 45" x 27" single map sheet; includes map, legend, descriptive text, stratigraphic column, and inset map

 Bedrock Geology Open File Series (OFS) Carroll 1997 Christopher S. McGarry
Surficial Geology of Johnson County Sheet 1 Surficial Geology of Johnson County Sheet 2 Bedrock Geology of Johnson County, Illinois

Two 40" x 40" map sheets; sheet 1 contains map, legends, and 2 figures; sheet 2 includes 1 geologic column, legend, and 2 cross sections. Accompanying 38-page report includes discussion, references, 14 figures, 3 tables, and appendix.

 Bedrock Geology Johnson 2021 W. John Nelson, Joseph A. Devera, Charles F. Hoffman
Bedrock Geology of Lee County Bedrock Geology of Lee County, Illinois

1:62,500 Lee County area map; 55" x 30" single map sheet; includes map, legend, descriptive text, stratigraphic column and inset map

 Bedrock Geology Open File Series (OFS) Lee 1999 Christopher S. McGarry