Shetlerville formation proposed for succession of limestones interbedded with more or less calcareous shales unconformably underlying the Renault limestone in southeastern IL and adjacent parts of KY. Limestone and shale sequence is not uniform from place to place and the limestone layers also grade into shales horizontally so that in places limestone may constitute nearly entire formation, while elsewhere shales may compose the greater part. The limestones are commonly crystalline, dark gray or blue, and usually more or less cross-bedded. The unweathered shales are chiefly blue, although thin layers of red shale occur in places. The limestones weather yellowish or buff; the shales weather yellowish, buff, or ashy gray. Thickness of formation approximately 30 ft. Much more shaly, much more irregularly bedded, and much less uniform in character than underlying Ste. Genevieve, although it has been included in the Ste. Genevieve as part of Ulrich's Ohara limestone member. The Ohara member is a complex, of which Shetlerville formation constitutes lower part of upper division, while the lower division of the Ohara properly belongs to the Ste. Genevieve. The Shetlerville formation rests unconformably on "Lower Ohara." Unit is faunally more closely related to overlying Renault (also previously included in Ulrich's Ohara limestone) than to underlying Ste. Genevieve limestone.

Source: GNU records (USGS DDS-6; Reston GNULEX).

Blue River Group of IN revised in this report. Supersedes State nomenclature established by Shaver and others (1986). Both in the subsurface and in outcrop, Blue River divided into (ascending) St. Louis, Ste. Genevieve, and Paoli Limestones. Aux Vases and Renault, previously regarded as formations in the subsurface, now treated as members of Paoli Limestone, both in the subsurface and in outcrop, replacing usage of Popcorn and Shetlerville Members. Popcorn is here abandoned, while Shetlerville is restricted from IN. Shetlerville Member of Renault Limestone overlies Levias Limestone Member in IL.

Source: GNU records (USGS DDS-6; Reston GNULEX).