https://www.google.com/maps/place/North ... a1c9f198f4The link above will show the quarry/dogpark I think he was talking about. Big Ridge is located just to east and runs N-NE by S-SW. There is a layer of Ordovician Newala limestone that runs the length of the ridge at it's base. Most of the ridge is Ordovician/Cambrian Knox group. To the west of the Newala lay Ordovician Chickamauga supergroup. The Newala produces the biggest passage in the area but potential is in all rock mentioned. I personally would not put much stock in some kind of method to find caves there but would instead seek out a caver with knowledge of the local stone. I do know of some caves very near there that are in the Newala formation. I never heard from the gentleman but would be glad to take a look. Guess he either got help,found his way in or gave up.
edit to add: Not trying to diss cave finding methods but I have never seen the technology that could out do a knowledgeable caver familiar with the area limestone.