Girkin Formation

{{short description|Geologic formation in Kentucky, USA}}

{{Refimprove|date=February 2016}}

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.{{Cite web|title = Groundwater Resources of Logan County, Kentucky|url = http://www.uky.edu/KGS/water/library/gwatlas/Logan/GWavailability.htm|website = www.uky.edu|access-date = 2016-01-26}}

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