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1.
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Bedrock Geology: Illinois, 2005 illinois

2005. Illinois State Geological Survey. This feature dataset shows the distribution and extent of the bedrock geologic units within the State of Illinois, as depicted on the map Bedrock G...

2.

Glacial Boundaries: Illinois, 1998 illinois

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...

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Bedrock Geology of Illinois - Geologic Units, 2004 illinois

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...

4.
Mixed

Quaternary Deposits: Illinois, 1996 illinois

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...

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Mixed

Structural Features - Faults: Illinois, 1995 illinois

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...

8.
Mixed

Structural Features: Illinois, 1995 illinois

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...

10.

Buried Bedrock Surface: Illinois, 2004 illinois

1994. Herzog, B.L.. B.J. Stiff, C.A. Chenoweth, K.L. Warner, J.B. Sievering, C. Avery. The Buried Bedrock Surface of Illinois map represents the first revision of the bedrock topography map since the second edition was published by th...