2021 GIS Data for Bedrock Geologic Map of the Indianapolis 30 x 60 Minute Quadrangle, Central Indiana Conversion of previously published map to Geologic Map Schema (GeMS) Level 3

Abstract

The 2021 GIS Data for Bedrock Geologic Map of the Indianapolis 30 x 60 Minute Quadrangle, Central Indiana is an Esri File Geodatabase that contains two feature data sets and four geodatabase tables detailing the bedrock geology of the Indianapolis 30 x 60 Minute Quadrangle in central Indiana. This data set conforms to "GeMS (Geologic Map Schema)--a standard format for the digital publication of geologic maps." For more information on GeMS, please refer to the supplemental information within this metadata. This was a conversion from paper map to GeMS-compliant GIS data. (Hasenmueller, W. A., and James, C. L., 2003, Bedrock geologic map of the Indianapolis 30 X 60 minute quadrangle, central Indiana: Indiana Geological Survey Open-File Study 03-07)

The Bedrock Geologic Map of the Indianapolis 30 x 60 Minute Quadrangle, Central Indiana was created to present basic bedrock geologic information that contributes to the characterization of potential aggregate resources, characterization of bedrock aquifer systems, and analysis of the overlying predominantly glacial deposits. This map is based on data obtained from several thousand records including petroleum well drillers' logs, geophysical logs, water well drillers' logs, descriptions of cores recovered by the Indiana Geological and Water Survey, seismic refraction records collected by the Indiana Geological and Water Survey, natural exposures in and near the map area, and exposures in active and abandoned quarries. This database is, in large part, the result of a cooperative mapping agreement between the U.S. Geological Survey (USGS) and the Indiana Geological and Water Survey through the STATEMAP program of the USGS.

The Bedrock Geologic Map of the Indianapolis 30 x 60 Minute Quadrangle, Central Indiana is a composite geodata set that conforms to "GeMS (Geologic Map Schema)--a standard format for the digital publication of geologic maps," available at http://ngmdb.usgs.gov/Info/standards/GeMS/. Metadata records associated with each element within the geodata set contain more detailed descriptions of their purposes, constituent entities, and attributes. An OPEN shapefile version of the data set is also available. It consists of shapefiles, DBF files, and delimited text files and retains all information in the native geodatabase, but some programming will likely be necessary to assemble these components into usable formats.