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1994
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1. Buried Bedrock Surface: Illinois, 2004
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...
2. Glacial Drift: Thickness and Character: Illinois, 2004
1994. Illinois State Geological Survey. This is an SDE feature dataset showing drift thickness in Illinois. Data are originally from ISGS Circular 490 by Piskin and Bergstrom (1975), Plat...
3. Major Bedrock Valleys: Illinois, 2004
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...