Buried Bedrock Surface of Illinois

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Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator:
Herzog, B.L.. B.J. Stiff, C.A. Chenoweth, K.L. Warner, J.B. Sievering, C. Avery
Publication_Date: 1994
Title: Buried Bedrock Surface of Illinois
Edition: 20040331
Geospatial_Data_Presentation_Form: map
Series_Information:
Series_Name: ISGS GIS Database
Issue_Identification: GISDB_BEDGEO.IL_Bedrock_Topography_1994_Ln
Publication_Information:
Publication_Place: Champaign, Illinois
Publisher: Illinois State Geological Survey
Other_Citation_Details:
Scale is 1:500,000. This is the digital version of ISGS Map Series, Illinois Map 5.
Online_Linkage: <http://www.isgs.illinois.edu/>
Online_Linkage: <http://illinois.edu>
Description:
Abstract:
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). The map is useful for the regional and statewide studies such as groundwater resource planning and geologic mapping. The data included on this map were compiled by many downhole logging and surface studies. This information was combined to revise the bedrock topography map for the entire state. Since some of the most extensive and productive aquifers in the state are located in thick glacial sediments of major buried bedrock valleys, special attention was given to data for known bedrock valleys. The revised map was published by the ISGS (Herzog et al, 1994) and much of the following text appears on the published map.

The bedrock topography is shown as 50-foot (15-meter) contours of bedrock elevation above mean sea level (msl). Bedrock elevations range from less then 250 feet (76 meters) in southern Illinois to more than a 1000 feet (300 meters) in the northwestern part of the state. Several major bedrock valleys are found across the state.

The greatest control for the present bedrock surface configuration was probably the preglacial surface configuration. The interpretations of bedrock topography have been modified since the 1950's. Horberg contoured his map with the philosophy that the bedrock surface map represented the preglacial topography modified by glacial erosion, which formed U-shaped valleys. The current map, showing narrow valley channels and bedrock knobs in wide channels, indicates complex preglacial and glacial erosion primarily from running water. The major valleys were formed before the minor valleys that appear as tributaries. Streams that formed during successive glaciations probably eroded to bedrock and produced the small tributary valleys to the main channels. The bedrock surface was less likely to be eroded as sediments accumulated during each successive glaciation.

Purpose:
Applications are regional or statewide studies, preferably at a scale of 1:500,000.

The Buried Bedrock Surface of Illinois will be useful in fields such as groundwater resource planning, engineering geology and earthquake hazard mapping. Data shown on this map were compiled from geologic data from drill holes, samples, surface observations and geophysical data from downhole logging and surface studies.

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.

Supplemental_Information:
The dataset was transferred for storage into the ISGS Enterprise GIS (SDE) in March, 2004. At that time the edition number was changed from 1.0 to 20040331.
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1994
Currentness_Reference: publication date
Status:
Progress: Complete
Maintenance_and_Update_Frequency: Irregular
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -91.58050943
East_Bounding_Coordinate: -87.38825182
North_Bounding_Coordinate: 42.49669441
South_Bounding_Coordinate: 36.9521143
Keywords:
Theme:
Theme_Keyword_Thesaurus: none
Theme_Keyword: geology
Theme_Keyword: bedrock
Theme_Keyword: topography
Place:
Place_Keyword_Thesaurus: none
Place_Keyword: Illinois
Access_Constraints:
ISGS information must be obtained directly from the ISGS or from an authorized distributor. Be aware that ISGS information obtained from an unauthorized third party may have been altered subsequent to original distribution, or may no longer be current.

Any access to these data, Web sites, computer systems, electronic services, and electronic networks is governed by University and campus policies, in particular, but not limited to, the Policy on Appropriate Use of Computers and Network Systems at the University of Illinois at Urbana-Champaign, the ISGS Terms of Use document available at the ISGS Web site, and the University of Illinois Web Privacy Notice.

Links to these are provided in the Cross References section.

Use_Constraints:
ISGS information is the property of and copyrighted by the Board of Trustees of the University of Illinois with all rights reserved.  University copyright policy is stated in the General Rules Concerning University Organization and Procedure, Article III, Section 4. A link is provided in the Cross References section.

Individuals or entities may make fair use of copyrighted ISGS material, such as reproducing a single figure or table, or using a brief text quotation, without obtaining formal permission, but in all cases the Illinois State Geological Survey must be credited as the source of the material. To reproduce ISGS information beyond the fair use standard, permission must be obtained from the ISGS Information Office, 615 East Peabody Drive, Champaign, Illinois 61820, 217-333-4747, isgs@isgs.illinois.edu. License fees and a license agreement may be required, depending on the proposed usage.

Any use of these data is governed by University and campus policies, in particular, but not limited to, the Policy on Appropriate Use of Computers and Network Systems at the University of Illinois at Urbana-Champaign, the ISGS Terms of Use document available at the ISGS Web site, and the University of Illinois Web Privacy Notice. Links to these are provided in the Cross References section.

Map information is to be used at a scientifically and cartographically appropriate scale, that is, at a scale no greater than indicated on the map or as described in the documentation of the map or map data.  Map information is not appropriate for, and is not to be used as, a geodetic, legal, or engineering base. Map information has no legal basis in the definition of boundaries or property lines and is not intended as a substitute for surveyed locations such as can be determined by a registered Public Land Surveyor.

The data do not replace the need for detailed site-specific studies.

Point_of_Contact:
Contact_Information:
Contact_Instructions: Please refer to the Distribution Information section.
Native_Data_Set_Environment: ArcSDE 9.1 on Oracle 10g
Cross_Reference:
Citation_Information:
Title: ISGS Terms of Use
Online_Linkage: <http://www.isgs.illinois.edu>
Cross_Reference:
Citation_Information:
Title: University of Illinois Web Privacy Notice
Online_Linkage: <http://www.vpaa.uillinois.edu/policies/web_privacy.cfm>
Cross_Reference:
Citation_Information:
Title:
University Copyright Policy (stated in the General Rules Concerning University Organization and Procedure, Article III, Section 4)
Online_Linkage: <http://www.uillinois.edu/trustees/rules.cfm#sec34>
Cross_Reference:
Citation_Information:
Title:
Policy on Appropriate Use of Computers and Network Systems at the University of Illinois at Urbana-Champaign
Online_Linkage: <http://www.fs.uiuc.edu/cam/CAM/viii/viii-1.1.html>

Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
The published geological map (ISGS Illinois Map 5, 1994) was the source for feature attributes. Attribute code assignments were reviewed by both the ISGS and the USGS and are believed to be fully representative of the source document.
Logical_Consistency_Report:
When in coverage format, this data set was checked for complete chain-node topology (no dangling arcs, except where appropriate), boundary values appropriate for map projection and map units, and appropriate "fuzzy" tolerances. There are no known arc attribute values outside the appropriate value domains.
Completeness_Report:
This data set depicts the buried bedrock surface of Illinois. Areas where the bedrock surface is exposed at the surface are not shown (e.g. the northwest Illinois driftless area, and much of southern Illinois).
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
Horizontal positional accuracy of this data with respect to the source map was verified by ISGS and USGS personnel by visual comparison (manual overlay) of source mylars and hard-copy plots. Arcs within one line-width of source mylars were deemed acceptable.
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator:
Herzog, B.L.. B.J. Stiff, C.A. Chenoweth, K.L. Warner, J.B. Sievering, C. Avery
Publication_Date: 1994
Title: Buried Bedrock Surface of Illinois
Geospatial_Data_Presentation_Form: map
Series_Information:
Series_Name: ISGS Illinois Map series
Issue_Identification: 5
Publication_Information:
Publication_Place: Champaign, Illinois
Publisher: Illinois State Geological Survey
Source_Scale_Denominator: 500000
Type_of_Source_Media: paper
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1994
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: none
Source_Contribution: contour attributes (elevation values)
Source_Information:
Source_Citation:
Citation_Information:
Originator:
Herzog, B.L.. B.J. Stiff, C.A. Chenoweth, K.L. Warner, J.B. Sievering, C. Avery
Publication_Date: 1994
Title:
Original mylar separates for map of Buried Bedrock Surface of Illinois
Geospatial_Data_Presentation_Form: map
Publication_Information:
Publication_Place: Champaign, Illinois
Publisher: Illinois State Geological Survey
Other_Citation_Details: unpublished material
Source_Scale_Denominator: 500000
Type_of_Source_Media: mylar
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1994
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: none
Source_Contribution: contour lines
Source_Information:
Source_Citation:
Citation_Information:
Originator: Anderson, R.C.
Publication_Date: 1980
Title: Geology for Planning in Rock Island County, Illinois
Geospatial_Data_Presentation_Form: report
Series_Information:
Series_Name: ISGS Circular
Issue_Identification: 510
Publication_Information:
Publication_Place: Champaign, Illinois
Publisher: Illinois State Geological Survey
Other_Citation_Details: 35 p.
Source_Scale_Denominator: not available
Type_of_Source_Media: paper
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1980
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: none
Source_Contribution: not available
Source_Information:
Source_Citation:
Citation_Information:
Originator: Berg, R.C., J.P. Kempton, A. Stecyk
Publication_Date: 1984
Title: Geology for Planning in Boone and Winnebago Counties
Geospatial_Data_Presentation_Form: report
Series_Information:
Series_Name: ISGS Circular
Issue_Identification: 531
Publication_Information:
Publication_Place: Champaign, Illinois
Publisher: Illinois State Geological Survey
Other_Citation_Details: 69 p.
Source_Scale_Denominator: not available
Type_of_Source_Media: paper
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1984
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: none
Source_Contribution: not available
Source_Information:
Source_Citation:
Citation_Information:
Originator: Bristol, B.B. and P.R. Seaber
Publication_Date: 1973
Title:
Ordovician Galena Group of Illinois-Structure and Oil Fields, Plate 1
Geospatial_Data_Presentation_Form: report
Publication_Information:
Publication_Place: Champaign, Illinois
Publisher: Illinois State Geological Survey
Source_Scale_Denominator: not available
Type_of_Source_Media: paper
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1973
Source_Currentness_Reference: not available
Source_Citation_Abbreviation: none
Source_Contribution: not available
Source_Information:
Source_Citation:
Citation_Information:
Originator: Curry, B.B. and P.R. Seaber
Publication_Date: 1990
Title:
Hydrogeology of Shallow Groundwater Resources, Kane County, Illinois
Geospatial_Data_Presentation_Form: report
Series_Information:
Series_Name: Contract/Grant Report
Issue_Identification: 1990-1
Publication_Information:
Publication_Place: Champaign, Illinois
Publisher: Illinois State Geological Survey
Source_Scale_Denominator: not available
Type_of_Source_Media: paper
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1990
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: none
Source_Contribution: not available
Source_Information:
Source_Citation:
Citation_Information:
Originator:
Greasse, A.M., R.A. Bauer, B.B. Curry, R.C. Vaiden, W.G. Dixon, Jr., J.P. Kempton
Publication_Date: 1988
Title:
Geological-Geotechnical Studies for Siting Superconducting Super Collider in Illinois
Geospatial_Data_Presentation_Form: report
Series_Information:
Series_Name: ISGS Environment notes
Issue_Identification: 123
Publication_Information:
Publication_Place: Champaign, Illinois
Publisher: Illinois State Geological Survey
Source_Scale_Denominator: not available
Type_of_Source_Media: paper
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1988
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: none
Source_Contribution: not available
Source_Information:
Source_Citation:
Citation_Information:
Originator: Heigold, P.C. and R.W. Ringler
Publication_Date: 1979
Title:
A seismic Refraction Survey of the Lower Illinois Valley Bottomlands
Geospatial_Data_Presentation_Form: report
Series_Information:
Series_Name: ISGS Circular
Issue_Identification: 507
Publication_Information:
Publication_Place: Champaign, Illinois
Publisher: Illinois State Geological Survey
Other_Citation_Details: 18 p.
Source_Scale_Denominator: not available
Type_of_Source_Media: paper
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1979
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: none
Source_Contribution: not available
Source_Information:
Source_Citation:
Citation_Information:
Originator: Horberg, L.
Publication_Date: 1950
Title: Bedrock Topography of Illinois
Geospatial_Data_Presentation_Form: report
Series_Information:
Series_Name: ISGS Bulletin
Issue_Identification: 73
Publication_Information:
Publication_Place: Champaign, Illinois
Publisher: Illinois State Geological Survey
Source_Scale_Denominator: not available
Type_of_Source_Media: paper
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1950
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: none
Source_Contribution: not available
Source_Information:
Source_Citation:
Citation_Information:
Originator: Horberg, L.
Publication_Date: 1957
Title: Bedrock Surface of Illinois
Geospatial_Data_Presentation_Form: map
Publication_Information:
Publication_Place: Champaign, Illinois
Publisher: Illinois State Geological Survey
Source_Scale_Denominator: 500000
Type_of_Source_Media: paper
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1957
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: none
Source_Contribution: not available
Source_Information:
Source_Citation:
Citation_Information:
Originator: Hunt, C.S. and J.P. Kempton
Publication_Date: 1971
Title: Geology for Planning in DeWitt County, Illinois
Geospatial_Data_Presentation_Form: report
Series_Information:
Series_Name: ISGS Environmental Geology Notes
Issue_Identification: 83
Publication_Information:
Publication_Place: Champaign, Illinois
Publisher: Illinois State Geological Survey
Other_Citation_Details: 42 p.
Source_Scale_Denominator: not available
Type_of_Source_Media: paper
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1971
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: none
Source_Contribution: not available
Source_Information:
Source_Citation:
Citation_Information:
Originator: Jacobs, A.M. (compiler)
Publication_Date: 1971
Title: Geology for Planning in St. Clair County, Illinois
Geospatial_Data_Presentation_Form: report
Series_Information:
Series_Name: ISGS Circular
Issue_Identification: 465
Publication_Information:
Publication_Place: Champaign, Illinois
Publisher: Illinois State Geological Survey
Other_Citation_Details: 35 p.
Source_Scale_Denominator: not available
Type_of_Source_Media: paper
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1971
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: none
Source_Contribution: not available
Source_Information:
Source_Citation:
Citation_Information:
Originator:
Kempton, J.P., W.H. Johnson, P.C. Heigold and K. Cartwright
Publication_Date: 1991
Title: Mahomet Bedrock Valley in east-central Illinois
Geospatial_Data_Presentation_Form: report
Series_Information:
Series_Name:
Geological Society of America (GSA) Special Paper
Issue_Identification: 285
Other_Citation_Details: p. 91
Source_Scale_Denominator: not available
Type_of_Source_Media: paper
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1991
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: none
Source_Contribution: not available
Source_Information:
Source_Citation:
Citation_Information:
Originator: Kempton, J.P., W.H. Morse, and A.P. Visocky
Publication_Date: 1982
Title:
Hydrogeologic Evaluation of Sand and Gravel Aquifers and Municipal Groundwater Supplies in east-central Illinois
Geospatial_Data_Presentation_Form: report
Series_Information:
Series_Name: Cooperative Groundwater/Resources Report
Issue_Identification: 8
Publication_Information:
Publication_Place: Champaign, Illinois
Publisher: Illinois State Geological Survey
Source_Scale_Denominator: not available
Type_of_Source_Media: paper
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1982
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: none
Source_Contribution: not available
Source_Information:
Source_Citation:
Citation_Information:
Originator:
Kempton, J.P., R.W. Ringler, P.C. Heigold, K. Cartwright, V.L. Poole
Publication_Date: 1981
Title: Groundwater Resources of Northern Vermillion County, Illinois
Series_Information:
Series_Name: Environmental Groundwater/Resources Report
Issue_Identification: 13
Publication_Information:
Publication_Place: Champaign, Illinois
Publisher: Illinois State Geological Survey
Other_Citation_Details: 36 p.
Source_Scale_Denominator: not available
Type_of_Source_Media: paper
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1981
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: none
Source_Contribution: not available
Source_Information:
Source_Citation:
Citation_Information:
Originator: Kempton, J.P. A.P. Visocky
Publication_Date: 1992
Title:
Regional Groundwater Resources in East McLean and Tazewell County: Mahomet Bedrock Valley
Series_Information:
Series_Name: Cooperative Groundwater/Resources Report
Issue_Identification: 13
Publication_Information:
Publication_Place: Champaign, Illinois
Publisher: Illinois State Geological Survey
Other_Citation_Details: 42 p.
Source_Scale_Denominator: not available
Type_of_Source_Media: paper
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1992
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: none
Source_Contribution: not available
Source_Information:
Source_Citation:
Citation_Information:
Originator: Kolata, D.R., T.C. Buschbach and J.D. Treworgy
Publication_Date: 1978
Title: The Sandwich Fault Zone of Northern Illinois
Geospatial_Data_Presentation_Form: report
Series_Information:
Series_Name: ISGS Circular
Issue_Identification: 505
Publication_Information:
Publication_Place: Champaign, Illinois
Publisher: Illinois State Geological Survey
Other_Citation_Details: Figure 2
Source_Scale_Denominator: not available
Type_of_Source_Media: paper
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1978
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: none
Source_Contribution: not available
Source_Information:
Source_Citation:
Citation_Information:
Originator: Larsen, J.I
Publication_Date: 1973
Title: Geology for Planning in Lake County, Illinois
Geospatial_Data_Presentation_Form: report
Series_Information:
Series_Name: ISGS Circular
Issue_Identification: 481
Publication_Information:
Publication_Place: Champaign, Illinois
Publisher: Illinois State Geological Survey
Other_Citation_Details: 43 p.
Source_Scale_Denominator: not available
Type_of_Source_Media: paper
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1973
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: none
Source_Contribution: not available
Source_Information:
Source_Citation:
Citation_Information:
Originator:
Larson, D.R., B.L. Herzog, R.C. Vaiden, C.A. Chenoweth and R.C. Anderson
Publication_Date: 1994
Title:
Hydrogeology of the Green River Lowland and Associated Bedrock Valleys of Northwest Illinois
Geospatial_Data_Presentation_Form: report
Publication_Information:
Publication_Place: Champaign, Illinois
Publisher: Illinois State Geological Survey
Other_Citation_Details: 43 p.
Source_Scale_Denominator: not available
Type_of_Source_Media: paper
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1994
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: none
Source_Contribution: not available
Source_Information:
Source_Citation:
Citation_Information:
Originator: Larson T.H. and V.L. Poole
Publication_Date: 1989
Title:
Geophysical Exploration of Potential Groundwater Resources near Bloomington, Illinois
Geospatial_Data_Presentation_Form: report
Series_Information:
Series_Name: ISGS Contract/Grant Report
Issue_Identification: 1989-2
Publication_Information:
Publication_Place: Champaign, Illinois
Publisher: Illinois State Geological Survey
Other_Citation_Details: 51 p.
Source_Scale_Denominator: not available
Type_of_Source_Media: paper
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1989
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: none
Source_Contribution: not available
Source_Information:
Source_Citation:
Citation_Information:
Originator: Lineback, J.A.
Publication_Date: 1979
Title: Quaternary Deposits of Illinois
Geospatial_Data_Presentation_Form: map
Series_Information:
Series_Name: ISGS map
Issue_Identification: same as title
Publication_Information:
Publication_Place: Champaign, Illinois
Publisher: Illinois State Geological Survey
Source_Scale_Denominator: 500000
Type_of_Source_Media: paper
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1989
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: none
Source_Contribution: not available
Source_Information:
Source_Citation:
Citation_Information:
Originator: Palmer, R.A. (compiler)
Publication_Date: 1983
Title:
The Decade of North American Geology (DNAG) 1983 Geologic Time Scale
Geospatial_Data_Presentation_Form: report
Series_Information:
Series_Name: Geology, v 11
Issue_Identification: no. 9
Other_Citation_Details: p. 503-504
Source_Scale_Denominator: not available
Type_of_Source_Media: paper
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1989
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: none
Source_Contribution: not available
Source_Information:
Source_Citation:
Citation_Information:
Originator: Piskin, K. and R.E. Bergstrom
Publication_Date: 1975
Title: Glacial Drift in Illinois: Thickness and Character
Geospatial_Data_Presentation_Form: map and report
Series_Information:
Series_Name: ISGS Circular
Issue_Identification: 490
Publication_Information:
Publication_Place: Champaign, Illinois
Publisher: Illinois State Geological Survey
Other_Citation_Details: 35 p.
Source_Scale_Denominator: 500000
Type_of_Source_Media: paper
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1975
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: none
Source_Contribution: not available
Source_Information:
Source_Citation:
Citation_Information:
Originator: Richmond, M.R. and D.S. Fullerton
Publication_Date: 1986
Title:
Introduction to Quaternary Glaciation in the United States of America
Series_Information:
Series_Name: Quaternary Science Review
Issue_Identification: v5
Other_Citation_Details: p. 130
Source_Scale_Denominator: not available
Type_of_Source_Media: paper
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1975
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: none
Source_Contribution: not available
Source_Information:
Source_Citation:
Citation_Information:
Originator: Walker, W.H., R.E. Bergstrom and W.C. Walton
Publication_Date: 1965
Title:
Report on the Groundwater Reservoir of the Havana Region in West-Central Illinois
Geospatial_Data_Presentation_Form: report
Series_Information:
Series_Name: Cooperative Groundwater/Resources Report
Issue_Identification: 3
Publication_Information:
Publication_Place: Champaign, Illinois
Publisher: Illinois State Geological Survey
Other_Citation_Details: 61 p.
Source_Scale_Denominator: not available
Type_of_Source_Media: paper
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1975
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: none
Source_Contribution: not available
Source_Information:
Source_Citation:
Citation_Information:
Originator:
Willman, H.B., John C. Frye, Jake A. Simon, Kenneth E. Clegg, D.H. Swann, Elwood Atherton, Charles Collinson, Jerry Lineback, and T.C. Buschbach.
Publication_Date: 1967
Title: Geologic Map of Illinois
Geospatial_Data_Presentation_Form: map
Series_Information:
Series_Name: ISGS map
Issue_Identification: same as title
Publication_Information:
Publication_Place: Capitol Heights, MD
Publisher: Williams and Heintz Map Corp.
Source_Scale_Denominator: 500,000
Type_of_Source_Media: mylar map
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1967
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: none
Source_Contribution: not available
Source_Information:
Source_Citation:
Citation_Information:
Originator: Willman, H.B., and J.C. Frye
Publication_Date: 1980
Title: The Glacial Boundary in Southern Illinois
Geospatial_Data_Presentation_Form: map and report
Series_Information:
Series_Name: ISGS Circular
Issue_Identification: 511
Publication_Information:
Publication_Place: Champaign, Illinois
Publisher: Illinois State Geological Survey
Other_Citation_Details: 23 p.
Source_Scale_Denominator: 500000
Type_of_Source_Media: paper
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1975
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: none
Source_Contribution: not available
Process_Step:
Process_Description:
Note: This entire section is taken directly from the published Buried Bedrock Surface map (Herzog et al, 1994). Horberg's work was updated by incorporating more detailed, published maps and unpublished data. This map was prepared for publication by combining computer techniques with traditional methods.
Process_Date: 1994
Process_Step:
Process_Description:
Well log data from the ISGS files were entered into an ISGS computer database created for this project. Data compilation concentrated on areas where Horberg mapped bedrock valleys. More well information was available for the northern 35 counties, where many densely populated communities depend on groundwater supplies, than for the rest of the state.
Process_Date: 1994
Process_Step:
Process_Description:
Well locations with bedrock elevation data plotted by computer at a scale 1:250000. Bedrock topography was manually contoured for separate maps of the northern, central, and southern parts of the state, then the maps were manually combined. Anomalous bedrock elevation data were rechecked with the original source and compared with other data for the area, Horberg's maps, and previously published regional local bedrock topography maps. Glacial margins are from Lineback (1979). The style of Horberg (1957) was followed by not contouring bedrock elevation beyond the glacial margin, except where the bedrock surface is overlain by thick river alluvium and outwash. Sizeable areas are shown where the bedrock surface within and beyond the glacial margin is within approximately 20 feet (6 meters) or less of the ground surface. Beyond the glacial margin, the bedrock surface may be covered by river alluvium, outwash, loess, or residuum.
Process_Date: 1994
Process_Step:
Process_Description:
After the map was assembled by hand, local and regional bedrock topography maps, published since Horberg (1957), were incorporated into this bedrock topography map. Unlike the state map, the regional and local maps used all data available for the areas under study at the time of publication. These maps were modified with new data and spliced into the hand-contoured map. Locations of these maps are shown in an inset map (figure 1) on the published (hardcopy) version of this map. Sources of the regional maps are listed in the references.
Process_Date: 1994
Process_Step:
Process_Description:
The contours were first hand-drafted onto a 1:250000-scale base map. The base included reference points at latitude/longitude degree intersections. The manually drafted contours and reference points were scanned to convert the line to digital format. Because of size limitations of the equipment, the map was scanned in eight parts. The resulting digital images were converted to a vector format, spatially referenced, edited, labeled with elevation values, and combined to form one map.
Process_Date: 1994
Process_Step:
Process_Description:
This data has gone though several review steps. The published version of the Buried Bedrock Surface Map went through an internal review process prior publication in 1993. Others involved in the review include Beverly Herzog (ISGS), Cheri Chenoweth (ISGS) and Kelly Warner (USGS).
Process_Date: 1994
Process_Step:
Process_Description:
Source coverage (bedtopo) converted to double precision and reprojected to GCS_NAD83 using Workstation ArcInfo 7.2.1.

The features were imported into the ISGS SDE enterprise database following steps outlined in ISGS procedure GISDB_0009.

Metadata updated.

Time_of_Day: 11214300
Process_Step:
Process_Description:
A user reported that the contour value for OBJECTID = 938 was in error. It was 600 but should be 550. The value was corrected.

The correction was done with SQL directly against the business table, rather than use SDE versioned editing. The SQL statement used was:

update GISDB.IL_Bedrock_Topography_1994_Ln set contour = 550 where objectid = 938;

Process_Date: 20041004
Process_Contact:
Contact_Information:
Contact_Person_Primary:

Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Vector
Point_and_Vector_Object_Information:
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: String
Point_and_Vector_Object_Count: 2620

Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Geographic:
Latitude_Resolution: 0.000000
Longitude_Resolution: 0.000000
Geographic_Coordinate_Units: Decimal degrees
Geodetic_Model:
Horizontal_Datum_Name: NAD27
Ellipsoid_Name: CLARKE1866
Semi-major_Axis: 6378206.4 meters
Denominator_of_Flattening_Ratio: 294.98
Vertical_Coordinate_System_Definition:
Altitude_System_Definition:

Entity_and_Attribute_Information:
Overview_Description:
Entity_and_Attribute_Overview:
Attribute items are in typical SDE feature class format. Those requiring additional explanation are:

CONTOUR The elevation above msl in Lambert feet. Values range from 200 to 1000 with a contour interval of 50 feet. A value of zero (0) is used to indicate the state boundary or areas where bedrock is at or near the surface.

Entity_and_Attribute_Detail_Citation: none

Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:
Information Office, Illinois State Geological Survey (ISGS), a division of the Institute of Natural Resource Sustainability (INRS) of the University of Illinois
Contact_Address:
Address_Type: mailing and physical address
Address: 615 East Peabody Drive
City: Champaign
State_or_Province: Illinois
Postal_Code: 61820
Country: USA
Contact_Voice_Telephone: 217-333-4747
Contact_TDD/TTY_Telephone: 217-785-0211
Contact_Electronic_Mail_Address: isgs@isgs.illinois.edu
Hours_of_Service: 8:00 a.m. - 4:30 p.m., Monday-Friday, U.S. Central Time
Distribution_Liability:
Refer to the Legal Notices of Terms and Conditions of the University of Illinois Web Privacy Policy (there is a link in the Cross References section) for policy statements regarding the following:

Disclaimer of Liability Disclaimer of Warranties and Accuracy of Data Disclaimer of Endorsement Disclaimer for External Links Disclaimer of Duty to Continue Provision of Data Security Choice of Law

By obtaining these data you agree to the provisions of the University of Illinois Web Privacy Policy, regardless of the manner in which the information was obtained.

Technical_Prerequisites:
The data are intended for use with GIS software. The ISGS uses ESRI ArcGIS software, however, ESRI formats can be imported into many different GIS software packages. It is expected that customers who obtain these data have the technical expertise to use GIS software. The ISGS does not provide software support of any kind.

Metadata_Reference_Information:
Metadata_Date: 20090224
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Instructions: Please refer to the Distribution Information section.
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time
Metadata_Access_Constraints:
The access constraints as stated for the data apply also to the metadata. Refer to the Access Constraints section of the Identification Information section.
Metadata_Use_Constraints:
The use constraints as stated for the data apply also to the metadata. Refer to the Use Constraints section of the Identification Information section.
Metadata_Extensions:
Online_Linkage: <http://www.esri.com/metadata/esriprof80.html>
Profile_Name: ESRI Metadata Profile

Illinois Natural Resources Geospatial Data Clearinghouse

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