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1.

Major Bedrock Valleys [Illinois] university-of-illinois-urbana-champaign

1994. Illinois State Geological Survey. Continuous lines representing the lowermost elevations/ locations of (buried) bedrock valleys in the state of Illinois. Names of buried valleys are... Illinois State Geological Survey.

2.

Driftless Areas [Illinois] university-of-illinois-urbana-champaign

1994. Illinois State Geological Survey. Driftless areas in Illinois. These areas are analogous to areas of the state where the bedrock surface is not buried by glacial drift. Data origina... Illinois State Geological Survey.

3.

Glacial Drift: Thickness and Character [Illinois] university-of-illinois-urbana-champaign

1994. Illinois State Geological Survey. Unconsolidated deposits, mainly glacial drift, overlie the bedrock surface in most of Illinois. Data are originally from ISGS Circular 490 by Piski... Illinois State Geological Survey.

4.

Woodfordian Moraines [Illinois] university-of-illinois-urbana-champaign

1991. Illinois State Geological Survey. Named Woodfordian moraines, or Wisconsinan End Moraines, of Illinois. Data originally from ISGS Bulletin 94, Pleistocene Stratigraphy of Illinois, ... Illinois State Geological Survey.