Coarse-grained Materials Within 50 Feet of the Ground Surface in Illinois
Entry ID: IGDNR_ALLST_AQ50

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Summary
Abstract: This map shows the distribution of coarse-grained materials and permeable
bedrock within 50 feet of ground surface in Illinois. This includes bedrock,
sand and gravel, and alluvial units with characteristics that suggest a
potential to store or conduct groundwater and yield potable water to wells and
springs. It was derived from stack-unit map data in the ISGS data set STACK-ST.
Aquifers or potential aquifers on this map are defined as sand and gravel units
at least five feet thick, sandstone at least ten feet thick, and fractured
limestone or dolomite at least fifteen feet thick with a lateral extent of at
least one square mile. Minor aquifers typically yield from five to seventy
gallons of potable water per minute. Potable water is defined as water
containing less than 2,500 mg/L of total dissolved solids. For use in this data
set, the following stratigraphic units are considered to be aquifers or
potential aquifers meeting these criteria: (although Cahokia Alluvium is
primarily fine- grained, it is included because it contains numerous sand and
gravel deposits.)

Cahokia Alluvium
Parkland Sand
Equality Formation, Dolton Member
Henry Formation
Sand and gravel within Wedron Formation
Sand and gravel within Winnebago Formation
Pearl Formation (includes Hagarstown Member)
Sand and gravel within Glasford Formation
Mounds gravel and related units
Cretaceous sediments, silts, sands, etc.
Pennsylvanian rocks, mainly sandstones
Mississippian rocks, mainly limestones, some sandstones
Silurian and some Devonian rocks, mainly dolomite
Ordovician and Cambrian rocks, mainly dolomite, some sandstone

Coverage is intended to identify areas of Illinois where there is a potential
for shallow aquifers to exist. These data are appropriate for regional thematic
analysis.

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


Link: VIEW EXTENDED METADATA
Description: FGDC metadata on the Coarse-grained Materials Within 50 Feet of the Ground
Surface in Illinois.


Geographic Coverage
 N: 42.4956 S: 36.9535  E: -87.384  W: -91.5826
 Max Depth: 50 FT

Data Set Citation
Dataset Originator/Creator: Riggs, M.H., D. Nelson, C.C. Abert
Dataset Title: Coarse-grained Materials Within 50 Feet of the Ground Surface in Illinois
Dataset Series Name: ISGS GIS Database
Dataset Release Date: 1997
Dataset Release Place: Champaign, Illinois
Dataset Publisher: Illinois State Geological Survey
Version: 2.0
Issue Identification: aq50
Data Presentation Form: map
Other Citation Details: Scale is 1:250,000


Temporal Coverage
Start Date: 1996-01-01


Location Keywords
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > ILLINOIS


Science Keywords
BIOSPHERE >TERRESTRIAL ECOSYSTEMS >KARST LANDSCAPE    [Definition]
TERRESTRIAL HYDROSPHERE >GROUND WATER >AQUIFERS    [Definition]
LAND SURFACE >EROSION/SEDIMENTATION >SEDIMENTS >SAND    [Definition]
LAND SURFACE >EROSION/SEDIMENTATION >SEDIMENTS >GRAVEL    [Definition]
LAND SURFACE >GEOMORPHOLOGY >KARST LANDFORMS/PROCESSES    [Definition]
SOLID EARTH >GEOMORPHIC LANDFORMS/PROCESSES >KARST LANDFORMS    [Definition]
SOLID EARTH >ROCKS/MINERALS/CRYSTALS >BEDROCK LITHOLOGY    [Definition]
SOLID EARTH >ROCKS/MINERALS/CRYSTALS >METAMORPHIC ROCKS    [Definition]
SOLID EARTH >ROCKS/MINERALS/CRYSTALS >SEDIMENTARY ROCKS    [Definition]


ISO Topic Category
BIOTA
GEOSCIENTIFIC INFORMATION


Access Constraints
None


Use Constraints
Suitable for regional applications only (1:250,000 scale or smaller). The
Illinois State Geological Survey does not guarantee the validity or accuracy of
these data. Data set is not to be redistributed. Any product that uses this
data must cite the Illinois State Geological Survey.

It is important to realize that characteristics which identify formations as
potential aquifers do not imply that a particular unit is indeed an aquifer.
For example, although Cahokia alluvium contains coarse-grained sand and gravel
deposits which could store or conduct groundwater, it is predominantly a silty
deposit associated with periodic flooding. Similarly, there are certainly
existing shallow aquifers associated with other geologic formations not
identified on this map. Because these data are generalized over a large areal
extent, the user needs a good working knowledge of the geologic formations used
here in order to derive valid and useful interpretations. Descriptions of the
stratigraphic classifications used in this data set can be found in Willman and
Frye, 1970, Pleistocene Stratigraphy of Illinois, ISGS Bulletin 94. Also,
several of these stratigraphic units have since been reclassified. The user
should consult Hansel and Johnson, 1996, Wedron and Mason Groups:
Lithostratigraphic Reclassification of Deposits of the Wisconsin Episode, Lake
Michigan Lobe Area, ISGS Bulletin 104.

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
GIS
Geographic Information Systems
Geology
Aquifer
Sand
Gravel
Hydrology
Surficial
Coarse Grain


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: 13.7MB
Distribution_Format: Arc/Info export format
Fees: No fees


Personnel
TYLER B. STEVENS
Role: DIF AUTHOR
Phone: (301) 614-6898
Fax: 301-614-5268
Email: Tyler.B.Stevens at nasa.gov
Contact Address:
NASA Goddard Space Flight Center
Global Change Master Directory
City: Greenbelt
Province or State: MD
Postal Code: 20771
Country: USA


MATT RIGGS
Role: TECHNICAL CONTACT
Phone: 217-244-2425
Fax: 217-333-2830
Email: riggs at geoserv.isgs.uiuc.edu
Contact Address:
Illinois State Geological Survey
615 East Peabody Drive
City: Champaign
Province or State: Illinois
Postal Code: 61820
Country: USA



Creation and Review Dates
DIF Creation Date: 2004-03-04
Last DIF Revision Date: 2009-03-26

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