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Buried Bedrock Surface: Illinois, 2004 illinois

1994. Herzog, B.L.. B.J. Stiff, C.A. Chenoweth, K.L. Warner, J.B. Sievering, C. Avery. The Buried Bedrock Surface of Illinois map represents the first revision of the bedrock topography map since the second edition was published by th...


Depth Ranges of the Hymera Coal Member: Indiana purdue

2014. Indiana Geological Survey. In the past a series of reports on coal resources of selected counties in Indiana were published as part of the Special Report series of the Indian...


Bedrock Exposures in Iowa iowa

2018. This polygon data coverage was derived from the Iowa county soil surveys that were digitized by the Iowa Cooperative Soil Survey (ICSS), which incl...