|St. Peter Sandstone, Illinois Basin
Meents and others (1952) reported brine chemistry for the St. Peter Sandstone in the central Illinois Basin, and their results are presented in the GIS. Their data show an increase in total dissolved solids concentration with depth.
Meents, W. F., Bell, A. H., Rees, O. W., and Tilbury, W. G., 1952, Illinois oilfield brines, their geologic occurrence and chemical composition: Illinois Geological Survey, Illinois Petroleum No. 66, 38 p.