Illinois State Geological Survey 1998 20040423 vector digital data ISGS GIS Database GISDB_QTGEO.IL_Glacial_Bndys_Py Champaign, Illinois Illinois State Geological Survey This is an ESRI feature class containing glacial boundary polygons 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 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. 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. Recent updates to the data: In April 2004 edition 1.1 of the data set was transitioned to storage in an Oracle RDBMS using the ArcSDE geodatabase model. The result (this version) is designated Edition 20040423. 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 was edition 1.1. 1996 publication date of ISGS Bulletin 104. Complete Irregular -91.513518 -87.495214 42.508348 36.969972 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 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. Please refer to the distribution information. ArcGIS 9.1 on Windows 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 was present in the source coverage. 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. 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 Source coverage converted to double precision and reprojected to GCS_NAD83 using Workstation ArcInfo 7.2.1. Metadata updated. 20040423 ISGS staff Vector G-polygon 10 0.000001 0.000001 Decimal degrees North American Datum of 1983 Geodetic Reference System 80 6378137.000000 298.257222 IL_Glacial_Bndys_Py FID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. Shape Feature geometry. ESRI Coordinates defining the features. GLC_BND Attribute items are in typical SDE feature class format. Those requiring explanation are: 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, Quaternary Geology Section mailing and physical address

615 East Peabody Drive

Champaign Illinois 61820 USA 217-333-4747 217-785-0211 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. The data are intended for use with GIS software. The ISGS uses ESRI ArcGIS software, however, the ESRI shapefile format can be imported into many different GIS software packages. It is expected that customers who order this data have the technical expertise to use GIS software. The ISGS does not provide software support of any kind. 20060831 Please refer to the distribution information. FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 local time None. None. http://www.esri.com/metadata/esriprof80.html ESRI Metadata Profile