ISGS Mapping Programs
Great Lakes Geologic Mapping Coalition
The state geological surveys of Illinois, Indiana, Michigan, and Ohio and the U.S. Geological Survey (USGS) joined in 1999 to form the Great Lakes Geologic Mapping Coalition to focus on new geologic mapping in the Great Lakes states. Recently, the state surveys of Minnesota, Wisconsin, Pennsylvania, and New York have joined and the Coalition name was changed to the current form. The purpose of the Coalition is to promote geologic mapping, both 2-D and 3-D, that specifically addresses the need for maps with the types of information decision-makers need regarding groundwater assessments, environmental protection, mineral resource availability, and earth hazard mitigation. By combining and utilizing the expertise and resources from the nine surveys, key scientific questions, such as the origin, nature, distribution, and resource potential of the glacial deposits, can be more effectively addressed. The Coalition members have prioritized areas for study within their respective states. Large digital databases have been compiled and 3-D mapping techniques are being used to analyze, interpret, and visualize geologic sediments from landsurface to top of bedrock. The databases are being used by Coalition hydrogeologists to model groundwater flow and address various groundwater issues. A variety of map scales are used ranging from 1:24,000-scale, quadrangle-based areas to 1:100,000-scale regional maps. A number of intermediate scales and very large scale maps are produced to illustrate specific issues. High resolution digital elevation models derived from LiDAR data have proven valuable as base materials for detailed landscape analysis. All of the products will be available for viewing at the Coalition website, and the Illinois products can be viewed at the ISGS web site. The Coalition mapping is ongoing. New products are being developed and new visualization techniques are being applied to better illustrate the research results and distribute the products to federal, state, county, municipal, and public agencies, as well as the public in general.
EDMAP is a program of the U.S. Geological Survey that provides funding to colleges and universities, to support student training in geologic mapping. The products of this program are 1:24,000-scale geologic maps that are produced by students, under the supervision of a faculty advisor. ISGS makes these maps available as a courtesy to the participating universities to provide students and faculty with a means to permanently reference their mapping efforts and to further encourage Illinois' academic institutions to participate in this worthwhile educational program. EDMAP products have not been reviewed by ISGS and do not conform to ISGS standards. They are available only as free downloadable PDF files through the ISGS Web site.
STATEMAP is a program of the U.S. Geological Survey that provides cost-share support for geologic mapping to states on a competitive basis. The products of this program are 1:24,000-scale maps of bedrock and surficial geology and are produced within a one-year timeframe. STATEMAP products have not been formally reviewed and may not conform to ISGS cartographic standards. Most are available only as downloadable PDF files through the ISGS Web site. Many STATEMAP products are revised and published as IPGM or IGQ maps.
Updated 10/21/2011 SLD