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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
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- "Groundwater Resources of Logan County, Kentucky". www.uky.edu. Retrieved 2016-01-26.