Bedrock Geology of Illinois - Geologic Units, 2004
1996. Illinois State Geological Survey. This feature class shows the distribution and extent of the bedrock geologic units within the State of Illinois, as depicted on the Geologic Map of...
Quaternary Deposits: Illinois, 1979
1979. Illinois State Geological Survey. Digital representation of the Quaternary Deposits in Illinois map by Lineback (1979). Map scale is 1:500,000. Shows Quaternary deposits that lie at...
Driftless Areas: Illinois, 2004
1994. Illinois State Geological Survey. This is a polygon feature class containing driftless areas in Illinois. These areas are analogous to areas of the state where the bedrock surface i...
Woodfordian Moraines of Illinois, 2004
1991. Illinois State Geological Survey. This is an SDE polygon feature class containing named Woodfordian moraines, or Wisconsinan end moraines, of Illinois. Scale is 1:500,000. The prima...
Glacial Boundaries: Illinois, 1998
1998. Illinois State Geological Survey. Glacial boundary lines representing the extent of glaciation for major glacial episodes in Illinois. Data originally from Quaternary Deposits in Il...
Quaternary Deposits: Illinois, 1996
1996. Barb Stiff. This feature dataset is a generalized version of Quaternary Deposits of Illinois. Updated to reflect the areal distribution of the Wedron and Mason...
Physiographic Divisions: Illinois, 2004
1993. Illinois State Geological Survey. This is an ESRI feature class showing boundaries for physiographic divisions in Illinois. Data are originally from ISGS Report of Investigations 12...
Soil Associations Map (500K): Illinois, 2004
1984. Illinois State Geological Survey. This is a polygon feature class showing soil associations in Illinois, from the General Soil Map of Illinois (Fehrenbacher, 1982). Created in 1984 ...
Structural Features - Faults: Illinois, 1995
1995. Illinois State Geological Survey. This is a partial representation of Plate 1 from ISGS Bulletin 100 (1993). Features depicted are limited to well documented, significant faults, fa...
Structural Features: Illinois, 1995
1995. Illinois State Geological Survey. This feature dataset is a representation of Plate 1 from ISGS Bulletin 100 (1993) by W. John Nelson. Features depicted are limited to well document...
