Oh my god? I am a spelunker. All the Caves are in limestone, pure and simple. Mississippian is pure limestone. In my area we have St. Genevieve and St. Louis limestone. Mammoth Cave, the worlds longest cave system, here where I live, is the longest cave system on earth. It is here because it is solid limestone topped with sandstone.
My grand father/great grand father and great great grand father's owned Kentucky distillery #62. You do not make bourbon without a limestone spring. There is more limestone in Edmonson/Barren/ Hart and Warren counties than in the rest of the state.
Western Kentucky may be more limestone than any other place in the U.S.
Here are some pictures when I was in High School. All the rock in all our cave are pure limestone:
Folks this is my wheel house. Caves and Kentucky Bourbon. I know my shit.
Edit: the Science fair picture is backward. I am the skinny kid on the left. I am holding the preserved "blind" fish.