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acoustic aquifer argillaceous Assistant Chemist Assistant Geologist Associate Geologist bedrock beds Big Ridge biocalcarenite branchiate brownish gray calcareous chert clay minerals clayey Coal coarse coarse-grained contains core Creek crinoidal Cypress Ditch Auger depth dolomitic early Woodfordian electrical logs faunas feet above base fine-grained flow foot fossil fossiliferous fresh water Gallatin Gallatin County gastropods Geologist Illinoian Illinois Basin Illinois Geol inches thick Ironton-Galesville Lake Michigan lake plain Lake Saline leached light gray lithology LOCALITY loess Louis Limestone lower McLean County medium-grained mollusks mottled nodules NWk Sec outcrop outwash Overburden Oxville Pennsylvanian Peoria Loess percent chert percent soluble Ph.D Piatt Counties Pleistocene relative density Research Assistant rock Salem Limestone Saline River sample Sand sandy Scott County Section sediments shale Silt Silty clay Simon Aquifer strata stratigraphic surface Technical Assistant Top perfa upper valleys velocity weathered Willman Wisconsinan yellowish brown