Nov 5, 2010 · This particular version of the shapefile was produced by the Indiana Geological Survey as part of an effort to populate the National Geothermal Data System (NGDS) with data in a digital form.

Jan 23, 2025 · BEDROCK_GEOL_RGM_IN is a polygon shapefile that shows the bedrock geology of the state of Indiana, produced from the Indiana Geological Survey Regional Geologic Map series, which was mapped at a scale of 1:250,000. The mapped stratigraphic units include selected systems, groups, and formations.

The mapped stratigraphic units include systems and selected groups, formations, and other stratigraphic units. This particular version of the shapefile was produced by the Indiana Geological Survey as part of an effort to populate the National Geothermal Data System (NGDS) with data in a …

Nov 5, 2010 · The mapped stratigraphic units include systems and selected groups, formations, and other stratigraphic units. This particular version of the shapefile was produced by the Indiana Geological Survey as part of an effort to populate the National Geothermal Data System (NGDS) with data in a digital form.

Users can build a USGS-style topographic map of any U.S. location for free and immediate download. Historic U.S. topographic maps are available through the USGS topoView web application. Where is IndianaMap? IndianaMap transferred to the Indiana Geographic Information Office (GIO) on May 18, 2022. It is available at indianamap.org.

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Geologic time was subdivided into a hierarchy of chronostratigraphic units of unknown duration. The application of radiometric dating techniques to determine the absolute ages of rocks resulted in the discipline of geochronology and the ability to establish geologic time scales.

Geologists map the bedrock surface by using topographic maps, data from drilled holes, and geophysical methods; these maps show an irregular surface crossed by numerous drainages.

Geologic map of Indiana showing maximum ages of mappable units. Image by Jonathan R. Hendricks for the Earth@Home project developed using QGIS and USGS data (public domain) from Fenneman and Johnson (1946) and Horton et al. (2017).

Sediments were laid down and compressed to form the sandstones, limestones and shale layers that make up Indiana's bedrock. These layers represent a geologic record or timeline, with the older sediments underlying the more recent ones.