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4 Titles Match Your Query
Showing 1 through 4 of 4
1. Bedrock Valleys of Illinois [IGDNR_ALLST_BEDVAL]
This data set shows continuous lines representing the lowermost elevations/locations of (buried) bedrock valleys in the state of Illinois. Additionally, names of buried valleys are annotated. ...


2. Driftless Areas in Illinois [IGDNR_DRIFTLESS]
This is an Arc/Info polygon data set containing driftless areas in Illinois. These areas are analogous to areas of the state where the bedrock surface is not buried. Data are originally ...


3. Glacial Drift in Illinois: Thickness and Character [IGDNR_DRIFTTHK]
This map is a digital Arc/Info line and polygon coverage of drift thickness in Illinois. Data are originally from ISGS Circular 490 by Piskin and Bergstrom (1975), Plate 1. Contours (lines) ...


4. Buried Bedrock Surface of Illinois [IGDNR_BEDTOPO]
The Buried Bedrock Surface of Illinois map represents the first revision of the bedrock topography map since the second edition was published by the Illinois State Geological Survey (Horberg, 1957). ...


Showing 1 through 4 of 4
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