County Maps

Coal maps

Illinois County Geologic Maps

Kane County - aquifer sensitivity, bedrock geology, cross sections, major Quaternary aquifers, and three-dimensional geologic model

Illinois Preliminary Geologic Maps

Madison County - surficial geology

ISGS Open File Series

Carroll County - aquifer sensitivity, bedrock topography, bedrock geology, data point locations, land cover, potential dolomite resources, surficial geology, shaded relief, surface slopes and surface topography
Cook County - geologic atlas of Cook county for planning purposes
Jo Daviess County - aquifer sensitivity, bedrock geology, bedrock topography, location of data points, drift thickness, land cover, land surface topography, surifical geology, and shaded relief of the bedrock surface.
Lake County - 3-D visualization of bedrock resources
Lee County - bedrock geology, bedrock topography, data point locations, drift thickness, surficial geology, shaded relief, and surface topography
McLean County - bedrock topography, data point locations, drift thickness, extraction operations, and surface topography
Tazewell County - aquifer sensitivity, bedrock topography, data point locations, drift thickness, resource extraction and landfill activities, surficial geology, shaded relief, surface slopes and surface topography