LJ125,
Don't know much about Jackson County.
I have been to Lebanon TN which is not too far from there and in Lebanon there is lots of rock near the surface (which might be good for seng) but there is also lots of Cedar Trees too (which might not be good for seng).
Now the only woods I have been in in Lebanon was when they had one of the TN State NFAA Archery tournaments there back in the late 80's. I won the State International NFAA Championship there when they had it in Lebanon that year.
Best I remember that was in a Park type setting, seems like it was called the Cedars of Lebanon State Park - but that has sure been a long time ago and could be wrong on that.
Other areas may not be so covered in Cedars as that Park area was.
Where I live down in southern middle TN our elevation ranges from 600-1100 and we find most of our seng below the 750' elevation range. There are exceptions, but most is below 750' and it also pretty much has to be on north or north east facing hillsides too with only a few rare exceptions to that.
Good Luck with your land search.
TNhunter