The Logansport quadrangle is located in the north-central portion of Indiana where bedrock units that straddle the Kankakee Arch are buried by up to 400 ft of glacially derived Quaternary sediments. High-purity carbonate from Silurian reefs provides raw materials for construction and manufacturing in the region. The bedrock units between the shales of the New Albany Shale (Devonian-Mississippian) and Maquoketa Group (Ordovician) compose the “Silurian-Devonian carbonate bedrock aquifer.”
McLaughlin, P. I., Bancroft, A. M., and Johnson, M. R., 2019, Bedrock geology of the Logansport 30- x 60-minute quadrangle, Indiana: Indiana Geological and Water Survey, Indiana Journal of Earth Sciences, v. 1, scale 1:100,000. DOI 10.14434/ijes.v1i0.27314
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