Illinois State Geological Survey 1998 1.1, 199805 map ISGS GIS Database glcbnd Champaign, Illinois Illinois State Geological Survey Downloadable Data (Shift-Click to download data file) <URL:http://www.isgs.uiuc.edu/nsdihome/browse/statewide/glcbnd.e00> Browse Graphic (GIF) Screen-size image representing the nature of the data. <URL:http://www.isgs.uiuc.edu/nsdihome/browse/statewide/glcbndb.gif> Text (.txt) version of this Metadata file. (Shift-Click to download documentation) <URL:http://www.isgs.uiuc.edu/nsdihome/outmeta/glcbnd.txt> HTML (.html) version of this Metadata file. (Shift-Click to download documentation) <URL:http://www.isgs.uiuc.edu/nsdihome/outmeta/glcbnd.html> This is an Arc/Info polygon data set containing glacial boundary lines representing the extent of glaciation for major glacial episodes in Illinois. Data are originally from the Quaternary Deposits in Illinois (1:500,000) map by Lineback (1979). Data have been subsequently modified to conform with the reclassification by Hansel and Johnson, ISGS Bulletin 104 (1996). Glacial episode is identified for each polygon. The data include the Wisconsin, Illinois and the Pre-Illinois episodes. Areas not glaciated are also identified. The nominal scale is 1:500,000. The data are appropriate as a statewide overview of the extent of the major glacial episodes in Illinois. The data are not appropriate as a map base, except in generalized geologic mapping. Origin of the data: This layer originated with the Integrated Terrain Unit (ITU) digital data set prepared for the ISGS by Environmental Systems Research Institute, Inc. (ESRI) of Redlands, California in 1984. The ITU manuscript synthesizes and organizes natural resource information for the state. Data included are natural divisions, bedrock geology, Quaternary geology, STACK units, glacial boundaries, soul associations, SCS land resource areas, ecoregions, and potential natural vegetation. The mapping resolution was generally 640 acres. Waterbodies were mapped to a minimum size of 320 acres. Data were integrated in the following order: Quaternary geology, stack units, glacial boundaries, bedrock geology, soil associations, natural divisions, potential natural vegetation, SCS land resource areas, and finally ecoregions. Updates to the data: Edition 1.0 of these data were reviewed for internal logical consistency in May, 1998. As a result, tics were replaced, COVER-ID values were recalculated to be unique, and major revisions were made to polygon boundaries and attributes. See logical consistency report and process steps for May, 1998 for more details. The updated data set (this one) is edition 1.1. 1996 publication date of ISGS Bulletin 104. Complete Irregular -91.58062731 -87.02229099 42.50050364 36.94578309 none geology glacial glaciation glacier boundary boundaries none Illinois none Quaternary Wisconsinan Illinoian Pre-Illinoian none 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. These data should not be used at scales greater than 1:500,000. Illinois State Geological Survey Information Office mailing and physical address

615 East Peabody Drive

Champaign Illinois 61820 USA 217-333-4747 217-785-0211 217-244-0802 isgs@isgs.uiuc.edu 8:00 a.m. - 4:30 p.m., Monday-Friday, U.S. Central Time > GIS processing: Environmental Systems Research Institute, Inc. (ESRI) > ISGS staff > Documentation: R. Krumm, D. Nelson and S. Beaverson > Quality Control: ISGS Staff, D. Nelson, A. Hansel SunOS, 5.5.1, sun4m UNIX, ARC/INFO version 7.1.2 Illinois State Geological Survey 1984 map ISGS GIS Database quat79 Champaign, Illinois Illinois State Geological Survey Data Set Documentation <URL:http://www.isgs.uiuc.edu/nsdihome/outmeta/quat79.html> Curtis Abert 1991 map ISGS GIS Database moraines Champaign, Illinois Illinois State Geological Survey Data Set Documentation <URL:http://www.isgs.uiuc.edu/nsdihome/outmeta/moraines.html> Data set information was reviewed by ISGS Staff. Information included is accurate in regard to Hansel and Johnson, ISGS Bull. 104. There are no known polygon attribute values outside the appropriate value domains. Polygon and chain-node topology is present. Typically, ISGS Arc/Info coverages are checked for complete chain-node topology (no dangling arcs, except where appropriate), polygon labels (one per polygon, except for universal polygon), boundary values appropriate for map projection and map units, and appropriate "fuzzy" tolerances. All known episodic boundaries that can be appropriately mapped at a scale of 1:500,000 are shown. There may exist site-specific studies containing more recent data that are not included here. In the ITU data preparation process, glacial boundary lines were adjusted to the boundaries of till members of a Quaternary geology overlay produced during the integration of stack-units and Quaternary geology units. In areas where glacial till was absent (i.e., bedrock, loess, and silt areas) the glacial boundaries were left unchanged. No quantitative assessment of horizontal accuracy is available. These data are intended to show a general statewide overview of the areal extent of glacial episodes. Use at scales greater than 1:500,000 is discouraged. J.A. Lineback, Illinois State Geological Survey 1979 1.0 map Champaign, Illinois, USA Illinois State Geological Survey 500000 unknown (paper or mylar) 1979 publication date none linework and attributes Willman, H.B. 1967 map Champaign, Illinois, USA Illinois State Geological Survey 500000 paper 1976 publication date none unknown Hansel, A. and H. Johnson 1996 report Illinois State Geological Survey Bulletin 104 Champaign, Illinois, USA Illinois State Geological Survey n/a 1996 publication date none new attribute values based on reclassification Created in 1984 by ESRI as part of coverage TUPYMG; DISSOLVED from TUPYMG on INFO item GLC_BND. 1984 Renamed to GLCBND unknown Data set was reviewed in May, 1998. Review was limited to internal logical consistency of attribute items. Locations of features and accuracy of item values were not checked, except in cases where possible errors became apparent as a result of logical consistency checks. No checks were performed that involved plotting of hardcopy maps and manual overlay with source materials. For scope of review, see *path_name_suppressed*/surf_v1_0_rev.txt. Some changes were made, as follows: The existing set of tics was replaced by the set of tics from the coverage RE-STATE1. These were derived from 7.5 minute quadrangle corners (data set QUAD75) and give a good distribution of tics immediately outside the state boundary. COVER-ID values were recalculated to be unique. The existing state boundary line was replaced with the boundary from *path_name_suppressed*/state for general update purposes and to remove the portion of the state boundary that lies within the Lake Michigan area. Most importantly, the spatial extent and attribute values of several polygons were changed to reflect the lithostratigraphic reclassification of deposits as described in ISGS Bulletin 104 (Hansel and Johnson, 1996). Specifically, polygons coded as Late, Middle or Early Woodfordian were amalgamated into a single polygon coded as Wisconsinan. Polygons coded as Altonian or Illinoian (undifferentiated) were amalgamated into a single polygon coded as Illinoian. Polygons coded as Kansan (undifferentiated) were recoded to Pre-Illinoian. Polygons coded as Not Glaciated were unchanged. 199805 Vector Point 10 String 118 GT-polygon composed of chains 11 Lambert Conformal Conic 33 45 -89.5 33 914400.00000 meters 0.00000 coordinate pair unknown unknown feet NAD27 CLARKE1866 6378206.4 meters 294.98 > Attribute items are in typical ARC/INFO feature class format. > Those requiring additional explanation are: > Polygon attributes: > GLC-BND - Identifies the glacial episode (using the boundaries and > diachronic terminology of Hansel and Johnson, 1996) > 2 - Wisconsin > 5 - Illinois > 6 - Pre-Illinois > 9 - Not glaciated none Illinois State Geological Survey Information Office mailing and physical address

615 East Peabody Drive

Champaign Illinois 61820 USA 217-333-4747 217-785-0211 217-244-0802 isgs@isgs.uiuc.edu 8:00 a.m. - 4:30 p.m., Monday-Friday, U.S. Central Time The Illinois Department of Natural Resources (DNR) provides these geographic data "as is." DNR makes no guarantee or warranty concerning the accuracy of information contained in the geographic data. DNR further makes no warranties, either expressed or implied as to any other matter whatsoever, including, without limitation, the condition of the product, or its fitness for any particular purpose. The burden for determining fitness for use lies entirely with the user. Although these data have been processed successfully on computers of DNR, no warranty, expressed or implied, is made by DNR regarding the use of these data on any other system, nor does the fact of distribution constitute or imply any such warranty. In no event shall the DNR have any liability whatsoever for payment of any consequential, incidental, indirect, special, or tort damages of any kind, including, but not limited to, any loss of profits arising out of use of or reliance on the geographic data or arising out of the delivery, installation, operation, or support by DNR. An Arc/Info .e00 (export) file is currently available free of charge at the Illinois Natural Resources Geospatial Data Clearinghouse. Refer to the Citation Information portion of this file for access to downloadable data and metadata, and a visual (GIF image) representation of the data. Shift-click to download the data set and related documentation. (Data and metadata offered separately, please download both files.) 19980529 19980529 200005 Illinois State Geological Survey Information Office mailing and physical address

615 East Peabody Drive

Champaign Illinois 61820 USA 217-333-4747 217-785-0211 217-244-0802 isgs@isgs.uiuc.edu 8:00 a.m. - 4:30 p.m., Monday-Friday, U.S. Central Time FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 none none