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You searched for: geology Remove constraint geology Subject Geoscientific Information Remove constraint Subject: Geoscientific Information Contributor Illinois Remove constraint Contributor: Illinois Time Period 1950-1999 Remove constraint Time Period: 1950-1999
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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...


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...


Driftless Areas: Illinois, 2004 illinois

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...


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...


Major Bedrock Valleys: Illinois, 2004 illinois

1994. Illinois State Geological Survey. This feature dataset shows continuous lines representing the lowermost elevations/locations of (buried) bedrock valleys in the state of Illinois. A...


Physiographic Divisions: Illinois, 2004 illinois

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...


Quaternary Deposits: Illinois, 1979 illinois

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...


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...


Soil Associations Map (500K): Illinois, 2004 illinois

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 ...