Girkin Formation

The Girkin Formation is a geologic formation located in the Chester Escarpment of central Kentucky, USA. It comprises a level of Mammoth Cave and lies above the Ste. Genevieve Limestone and St. Louis Limestone and below the Big Clifty Sandstone in that area. The Girkin is a limestone Mississippian in age.

Members of the Girkin are as follows in descending order:
 * Beech Creek Member
 * Elwren Member
 * Reelsville Member
 * Sample Member
 * Beaver Bend Member
 * Bethel Member
 * Paoli Member