Seismotectonic maps in the vicinity of the lower Wabash Valley, Illinois, Indiana, and Kentucky - Digital Spatial Database: Structure contours on Cambrian-Precambrian unconformity

Online link https://geo-nsdi.er.usgs.gov/metadata/open-file/97-681/bcontours.faq.html
Description This cover contains structure contours of the elevations of the unconformity at the Cambrian-Precambrian boundary. These data were contributed by Glenn Bear of Indiana University as part of the work on his doctoral thesis. The southern part of the map wa
Originators Rhea, Susan
Publication U.S. Geological Survey Open-File Report 97-0681

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