Web-based glacial and bedrock geologic map products and databases for Allen County, Indiana

Status Start Date End Date Locations
completed Aug 1, 2006 Jul 31, 2007 Allen
Director: Nancy Hasenmueller
Other Researchers: Marni Karaffa, Robin Rupp Anthony H. Fleming
Funding: U.S. Geological Survey (USGS) - Great Lakes Geologic Mapping Coalition
Issue: Allen County is the site of Fort Wayne, Indiana's second largest city, and lies within Indiana Geological Survey's (IGS) mapping and outreach priority areas based on population density and transportation corridors.
Objective: To provide detailed geologic information in an area that continues to experience pressure on natural resources by a large population. The final product will provide traditional surficial geologic information, as well as a depiction of subsurface information based on subsurface databases.
Approach: The Web is becoming the medium of choice for delivering geologic information to both technical users and the general public. The Allen County Web site includes an Internet map server (IMS), as well as illustrations, educational summaries, and discussions of geologic maps and databases that complement the IMS. The site provides a front-end to the IGS enterprise geodatabases, which contain information used simultaneously for research and for viewing by the general public. The geodatabase systems allow maps and data to be efficiently created, managed, updated, and distributed.

Maps provided on the Allen County Web site include: 1) Digital elevation model terrain, 2) Landsat imagery, 3) Surficial geology, 4) Drift thickness, 5) Bedrock topography, 6) Bedrock geology, and 7) Water-table elevation. Technical database information includes: 1) Lithologic information compiled from water-well information in the Indiana Department of Natural Resources, Division of Water well records, 2) Natural gamma-ray geophysical log data, 3) Stratigraphic test hole data, and 4) Petroleum-well data.
Products: An Indiana Geological Survey Web site with Internet map server, educational, and geological data retrieval capabilities.
Benefits: The data available on the Allen County Web site will be widely used by the general public and by industry and government entities.

Allen County–a geologic atlas
Hasenmueller, N.R., Rupp, R.F., Olejnik, J., Karaffa, M.D., Walls, A.C., Radhakrishnan, P., Eaton, N.K., and Fleming, A.H., 2007, Allen County–a geologic atlas: Indiana Geological Survey Web site.