Quaternary Geology of the Bloomington 30- x 60-minute Quadrangle, Indiana Map and Geologic Map Schema (GeMS) Level 3 database

Abstract

The Quaternary Geology of the Bloomington 30- x 60-minute Quadrangle displays unconsolidated sediments deposited near the southern limit of multiple glaciations at the northern end of the Crawford Upland, Mitchell Plateau, and Norman Upland physiographic provinces in south-central Indiana. Glacial and proglacial deposits (diamicton, glaciofluvial, glaciolacustrine, and eolian sediments) of varying thickness associated with the Wisconsin, Illinois, and pre-Illinois Age glaciations overlie Paleozoic bedrock. Unconsolidated deposits were characterized through field observations, new and archived borehole data, lithologic information from the Indiana Department of Natural Resources water well database, and soils data from the U.S. Department of Agriculture, Natural Resource Conservation Service, Soil Survey Geographic (SSURGO) database. A light detection and ranging-based digital elevation model was used in combination with geologic data to identify landforms and infer contacts between unconsolidated units. 

Summary descriptions of mapped units are listed on the map sheet with more detailed descriptions in the accompanying pamphlet. Geochronologic (luminescence and radiocarbon ages) and borehole data are also found in the pamphlet.  

In addition to the map and pamphlet, a composite spatial data set that conforms to the standardized database schema known as GeMS (Geologic Map Schema) is also available for download. Metadata records associated with each element within the spatial data set contain detailed descriptions of their purpose, constituent entities, and attributes. 

This geologic map was funded in part through the STATEMAP program supported by the U.S. Geological Survey under Cooperative Agreement No. G22AC00424-00.