Mississippian System

Type section and use of name: The Shetlerville Formation was named by Stuart Weller (1920b, p. 123) for exposures of shale and limestone just east of Shetlerville, Hardin County, Ill. The unit was later restricted to the lower (mainly limestone) part of the original formation and was designated as a member of the Renault Formation (Swann, 1963, p. 82). An abandoned quarry south of Shetlerville in the SE¼NE¼SW¼ sec. 35, T. 12 S., R. 7 E., was referred to as the type section, in which the unit is 15 feet (4.6 m) thick.

The lower carbonate-rock-dominated part of the Paoli Limestone of Indiana outcrop usage was correlated by Pinsak (1957, p. 17-18) and Swann (1963, pl. 1) with the Shetlerville Limestone Member of Illinois. Although some uncertainties in this correlation remain, the Shetlerville is here recognized for Indiana usage as a member of the Paoli Limestone (fig. 2). It is overlain by the Yankeetown Member and underlain by the Popcorn Member. (See articles on these members, here newly recognized in Indiana.) A reference section for the Shetlerville in Indiana is the principal reference section for the Paoli Limestone, an abandoned quarry just north of the former railroad tracks on the west side of Paoli, Ind. (SW¼SE¼SE¼ sec. 35, T. 2 N., R. 1 W.).

Description: In Indiana the Shetlerville Member is 3 to 15 feet (0.9 to 4.6 m) thick along the outcrop from Putnam County in the north to Crawford County in the south (Kissling, 1967, p. 46). It contains light-gray medium- to thick-bedded limestone of variable textural types, mainly skeletal, micritic, and oolitic. Wavy argillaceous and silty laminae are present in many places through-out the Shetlerville, and a mottled gray-brown and brown brecciated limestone, similar in character to the Bryantsville Breccia Bed, is commonly present at the top of the Shetlerville. The lower surface is conformable and in places gradational with the underlying Popcorn Member (Kissling, 1967, p. 52).

Correlation: The Shetlerville Member of the Paoli Limestone corresponds to a part of the Renault Formation of Indiana subsurface usage .