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11. 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 ...
illinois

13. 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...
illinois

14. 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...
illinois

16. 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...