C. P. Weibel S. V. Panno 1997 20040408 vector digital data ISGS GIS Database GISDB_HYDRO.IL_Sinkhole_Areas_Py Champaign, Illinois Illinois State Geological Survey http://www.isgs.illinois.edu/ http://illinois.edu This feature class shows the distribution of areas that contain one or more sinkholes throughout the state of Illinois. Areas that contain sinkholes are susceptible to aquifer contamination and may also lack the stability required for certain land-uses. Sinkholes are one of the major indicators of karst terrains. This map provides basic data for land-use planning and decision making. Sinkhole data can be used to appraise local, regional, and general geologic conditions that might affect excavation and construction of roads, pipelines, foundations, and sewers, and construction of wells. These sinkhole data are useful for local planning of surface projects which may have an impact on shallow aquifers. The data are useful for regional land-use planning projects designed to protect shallow karst aquifers. This map may be useful for the exploration and exploitation of limestone. Karstification may have an effect on the evaluation of limestone resources and an impact on the groundwater during limestone extraction. These data are appropriate for use in regional thematic analysis. The data are not appropriate as a geodetic, legal or engineering base. The datasets were not and are not intended as a substitute for surveyed locations, such as can be determined by a registered Public Land Surveyor. Although useful in a GIS, the data have no legal basis in the definition of boundaries or property lines. This is edition 20040408, derived from edition 2.0. In April 2004 the source coverage was transitioned to storage in an Oracle RDBMS using the ArcSDE geodatabase model. The result (this version) is designated edition 20040408. Prior to this time the feature classe was stored as a coverage in the ISGS GISDB archive. Edition 2.0 differed from edition 1.0 in that some sinkhole polygons in northwestern Illinois were deleted after field examination suggested that the depressions may have an origination other than by sinkhole formation. In addition, additional sinkhole area polygons were added in southern, southwestern, and western Illinois. 19921103 19970203 ground condition Complete Irregular -91.4244 -87.3840 42.4951 37.1756 none aquifer groundwater water hydrology hydrogeology karst geology sinkhole bedrock hazard none Illinois 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. This feature class is for use at a scale of 1:100,000. 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. Please refer to the Distribution Information section. ArcSDE 9.1 on Oracle 10g http://www.isgs.illinois.edu http://www.vpaa.uillinois.edu/policies/web_privacy.cfm http://www.uillinois.edu/trustees/rules.cfm#sec34 http://www.fs.uiuc.edu/cam/CAM/viii/viii-1.1.html Attribute code assignments were checked by at least two individuals and are believed to fully represent the original hand-drawn maps. When this data set was in coverage form it 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 or polygon attribute values outside the appropriate value domains. This data set contains polygons indicating areas which are believed to contain sinkholes. Some sinkholes may not be represented on this map because of detection problems (primarily because of too small of a size, and dense vegetation cover). Not every sinkhole polygon was field checked. Therefore, it is possible that some depressions within the mapped polygons may have an origin different from sinkhole formation. Boundaries of sinkhole area polygons represent actual ground positions, but are generalized. Thus, this data set should not be used at map scales larger than 1:100,000 without specific field verification. Bell, A. H., M. O. Oros, and J. Van Den Berg 1961 ISGS Illinois Petroleum 75 Champaign, Illinois Illinois State Geological Survey 121 p. paper 1960 publication date none not available Bretz, J H. 1923 Illinois State Geological Survey Bulletin 43 Champaign, Illinois Illinois State Geological Survey n/a paper 1923 publication date none p. 205-304 Bretz, J H. 1940 Journal of Geology v. 46 Chicago, Illinois University of Chicago n/a paper 1940 publication date none p. 337-384 Buschbach, T.C., and G.E. Heim 1972 Illinois State Geological Survey Environmental Geology Notes 52 Champaign, Illinois Illinois State Geological Survey 35 p. n/a paper 1972 publication date none not available Csallany, S., and W.C. Walton 1963 Illinois State Water Survey Report of Investigation 46 Champaign, Illinois Illinois State Geological Survey 43 p. n/a paper 1963 publication date none not available Devera, J.A. 1993 map 24000 paper 1993 publication date none not available Ford, D.C., and P.W. Williams 1989 London Unwin Hyman Ltd. 601 p. n/a paper 1989 publication date none not available Graese, A.M. 1991 ISGS Circular 547 Champaign, Illinois Illinois State Geological Survey n/a paper 1991 publication date none not available Hackett, J.E., and R.E. Bergstrom 1956 ISGS Circular 207 Champaign, Illinois Illinois State Geological Survey n/a paper 1956 publication date none not available Knappen, R.S. 1926 Illinois State Geological Survey Bulletin 49 Champaign, Illinois Illinois State Geological Survey 141 p. n/a paper 1926 publication date none not available Kolata, D.R., and T.C. Buschbach 1976 ISGS Circular 491 Champaign, Illinois Illinois State Geological Survey n/a paper 1976 publication date none not available Kolata, D.R., T.C. Buschbach, and J.D. Treworgy 1978 ISGS Circular 505 Champaign, Illinois Illinois State Geological Survey 26 p. n/a paper 1978 publication date none not available Lamar, J.E. 1928 Trns. IL St Acad Sci 20 n/a paper 1928 publication date none p. 261-264 Otto, G.H 1963 Proceedings of Lecture Series, American Society of Civil Engineers N/A Chicago, Illinois Illinois Institute of Technology n/a paper 1963 publication date none 3.1-3.24. Piskin, K., and R.E. Bergstrom 1975 map Illinois State Geological Survey Circular 490 Champaign, Illinois Illinois State Geological Survey 35 p. n/a paper 1975 publication date none not available Rubey, W.W. 1952 Professional Paper 218 unknown United States Geological Survey 179 p. n/a paper 1952 publication date none not available Treworgy, J.D. 1981 Illinois State Geological Survey Circular 519 Champaign, Illinois Illinois State Geological Survey 83 p. n/a paper 1981 publication date none not available White, W.B 1988 not available Oxford University Press, Inc. 464 p. n/a paper 1988 publication date none not available Willman, H.B., and others 1967 map Illinois State Geological Survey map same as title Champaign, Illinois Illinois State Geological Survey 500000 paper 1967 publication date none not available Zeizel, A.J., W.C. Walton, T.A. Prickett, and R.T. Sasman 1962 Illinois State Geological Survey Illinois State Water Survey Cooperative Ground-Water Report Report 2 103 p. n/a paper 1962 publication date none not available These data were digitized from USGS 1:100,000 topographic/planimetric maps upon which the original data were compiled. Unknown Reviews of data. Source map underwent ISGS peer review. Line accuracy was checked by overlay of digital print-outs to original compilation maps. Lines within one line-width of source maps were deemed acceptable. Attribute accuracy was verified against source maps. 1994-95 The source coverage (karst) was imported into an ArcSDE enterprise geodatabase feature dataset for storage. Previously it was stored as individual coverages. The data were reprojected from the customary ISGS Lambert Conformal Conic projection (NAD27) to a geographic coordinate system (longitude, latitude) in decimal degrees (NAD83). Prior to import, the spatial reference of the data set was changed to Geographic, decimal degrees, NAD83 in double precision. Also at this time, this metadata file was updated. 20040401 Vector G-polygon 847 0.000001 0.000001 Decimal degrees North American Datum of 1983 Geodetic Reference System 80 6378137.000000 298.257222 Attribute items are in typical SDE feature class format. Those requiring additional explanation are: KARST - a value of "y" indicates polygon represents a karst area SQMILES - area of the polygon in square miles none Information Office, Illinois State Geological Survey (ISGS), a division of the Institute of Natural Resource Sustainability (INRS) of the University of Illinois mailing and physical address

615 East Peabody Drive

Champaign Illinois 61820 USA 217-333-4747 217-785-0211 isgs@isgs.illinois.edu 8:00 a.m. - 4:30 p.m., Monday-Friday, U.S. Central Time 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. 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. 20090224 Please refer to the Distribution Information section. FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 local time The access constraints as stated for the data apply also to the metadata. Refer to the Access Constraints section of the Identification Information section. The use constraints as stated for the data apply also to the metadata. Refer to the Use Constraints section of the Identification Information section. http://www.esri.com/metadata/esriprof80.html ESRI Metadata Profile