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Driftless Areas in Illinois

Abstract: This is a polygon feature class containing driftless areas in Illinois. These areas are analogous to areas of the state where the bedrock surface is not buried. Data are originally from the Buried Bedrock Surface map (1:500,000) by Herzog et al (1994) and the related feature class GISDB_BEDGEO.IL_Bedrock_Topography_1994_Ln.

There are no attribute data associated with the spatial data in this data set. The nominal scale is 1:500,000.

Purpose: Appropriate applications are regional or statewide studies, preferably at a scale of 1:500,000. These data can be used in conjunction with buried bedrock surface, loess, glacial boundary, and drift thickness information to demonstrate various aspects of the unglaciated portions of Illinois.

The data are not appropriate as a geodetic, legal or engineering base. The data set was not and is not intended as a substitute for surveyed locations, such as can be determined by a registered Public Land Surveyor. Although useful in a GIS as a reference base layer for maps, the data set has no legal basis in the definition of boundaries or property lines.
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Description: Access data

Description: FGDC metadata on Driftless Areas in Illinois.
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Caption:  Driftless Areas in Illinois
Geographic Coverage
Spatial coordinates   
  N: 42.0   S: 37.0   E: -87.0   W: -90.0

Data Set Citation
Dataset Originator/Creator: Illinois State Geological Survey
Dataset Title: Driftless Areas in Illinois
Dataset Series Name: ISGS GIS Database
Dataset Release Date: 1994
Dataset Release Place: Champaign, Illinois
Dataset Publisher: Illinois State Geological Survey
Version: 1.0
Issue Identification: driftless
Data Presentation Form: map
Online Resource:
Paleo Temporal Coverage
Access Constraints none
Use Constraints Reproduction or redistribution of copyrighted digital data sets
or products derived therefrom outside of licensees'
organization or entity is expressly forbidden. The only
exception is redistribution to consultants working for the
licensee, and then only for purposes, related to work for the
licensee. Such ... View entire text
Data Set Progress
Originating Center
Data Center
Geological Survey, Dept. of Natural Resources, Illinois Supplemental Info
Data Center URL:

Data Center Personnel
Phone: 217-333-5102
Fax: 217-333-2830
Email: denhart at
Contact Address:
615 East Peabody Drive
City: Champaign
Province or State: Illinois
Postal Code: 61820
Country: USA
Distribution Media: Online
Distribution Size: 241KB
Distribution Format: Arc/Info export format
Fees: No fees
Phone: 217-244-2510
Fax: 217-333-2830
Email: stiff at
Contact Address:
Illinois State Geological Survey
615 East Peabody Drive
City: Champaign
Province or State: Illinois
Postal Code: 61820
Country: USA
Extended Metadata Properties
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Creation and Review Dates
Last DIF Revision Date: 2018-05-11