Glacial Drift in Illinois: Thickness and Character
Entry ID: IGDNR_DRIFTTHK

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Summary
Abstract: 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) are coded with thickness, and polygons (areas
between contours) are coded with range of thickness. Nominal scale is
1:500,000.

Unconsolidated deposits, mainly glacial drift, overlie the bedrock surface in
most of Illinois. Glacial drift ranges from less than a few feet to
approximately 600 feet in thickness. The thickest drift occurs in major
preglacial valleys cut into the bedrock and filled with glacial sediments.
Regionally thick drift occurs in the N.E. portions of the state. The thinnest
drift, less than 25 feet thick and intersected by numerous bedrock outcrops,
occurs widely in southern and western portions of the State. Drift, as shown on
this map, may include any of the following:

unconsolidated deposits
glacial drift
Wisconsinan deposits
Illinoian deposits
till
glaciofluvial deposits
glaciolacustrine deposit
wind-blown deposits (loess)


Purpose: These data may be used to determine approximate depth to bedrock in regional
areas of the state (eg. townships). The data are not of sufficient detail for
use in determining drift thickness for specific locations. The data can be used
for physical or environmental models of the state's unconsolidated geologic
materials, eg. coupled with geophysical information, satellite imagery, air
photos, hydrologic data, or other data in a Geographic Information System at a
statewide scale of 1:500,000.

Supplemental_Information:
Updates to the data:

Edition 1.0 of this data set was replaced by this edition (2.0) in June, 1998.
These data were reviewed as described in the logical consistency report and
process steps for May, 1998. Contour values, which were not included in edition
1.0, are included in this version.

Related URL
Link: GET DATA
Description: Data available in Arc/Info export format.


Link: VIEW EXTENDED METADATA
Description: FGDC metadata on Glacial Drift in Illinois: Thickness and Character.


Geographic Coverage
 N: 42.0 S: 36.0  E: -87.0  W: -91.0

Data Set Citation
Dataset Originator/Creator: Illinois State Geological Survey
Dataset Title: Glacial Drift in Illinois: Thickness and Character
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: driftthk
Data Presentation Form: map


Paleo_Temporal_Coverage
Chrono Unit:


Location Keywords
CONTINENT > NORTH AMERICA
VERTICAL LOCATION > LAND SURFACE
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > ILLINOIS


Science Keywords
PALEOCLIMATE >LAND RECORDS >GLACIATION    [Definition]
PALEOCLIMATE >LAND RECORDS >LOESS    [Definition]
PALEOCLIMATE >LAND RECORDS >SEDIMENTS    [Definition]
PALEOCLIMATE >LAND RECORDS >STRATIGRAPHIC SEQUENCE    [Definition]
SOLID EARTH >ROCKS/MINERALS/CRYSTALS >BEDROCK LITHOLOGY    [Definition]
SOLID EARTH >ROCKS/MINERALS/CRYSTALS >SEDIMENTARY ROCKS    [Definition]


ISO Topic Category
CLIMATOLOGY/METEOROLOGY/ATMOSPHERE
GEOSCIENTIFIC INFORMATION


Access Constraints
none


Use Constraints
Reproduction or redistribution of copyrighted digital data sets or products
derived therefrom outside of licensee's 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
consultants may not further reproduce or redistribute these data sets. None of
these data shall be electronically duplicated on magnetic or optical media for
use by others, in whole or in part, without permission of the appropriate
custodial division within DNR. Any hardcopies utilizing DNR data sets shall
clearly indicate their source. If the licensee has modified the data in any
way they are obligated to describe the types of modifications they have
performed on the hardcopy map. Licensee specifically agrees not to
misrepresent DNR data sets, nor to imply that changes they made were approved
by DNR. These data are not to be used for commercial profit.


Keywords
DRIFT
DRIFTLESS
GLACIAL
GLACIOFLUVIAL
GLACIOLACUSTRINE
LOESS
THICKNESS
TILL
UNCONSOLIDATED
GIS
Geographic Information Systems


Data Set Progress
COMPLETE


Originating Center
ISGS


Data Center
Geological Survey, Dept. of Natural Resources, Illinois    [Information]
Data Center URL: http://www.isgs.uiuc.edu/

Data Center Personnel
Name: DATABASE ADMINISTRATOR ILLINOIS STATE GEOLOGICAL SURVEY
Phone: 217-333-5102
Fax: 217-333-2830
Email: denhart at nomad.isgs.uiuc.edu
Contact Address:
615 East Peabody Drive
City: Champaign
Province or State: Illinois
Postal Code: 61820
Country: USA



Distribution
Distribution_Media: Online
Distribution_Size: 164KB
Distribution_Format: Arc/Info export format
Fees: No fees


Personnel
BARB STIFF
Role: DIF AUTHOR
Role: TECHNICAL CONTACT
Phone: 217-244-2510
Fax: 217-333-2830
Email: stiff at geoserv.isgs.uiuc.edu
Contact Address:
Illinois State Geological Survey
615 East Peabody Drive
U.S.A.
City: Champaign
Province or State: Illinois
Postal Code: 61820
Country: USA



Creation and Review Dates
Last DIF Revision Date: 2009-03-26

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