How can you tell? I didn't even think about this one until my 8 year old son said "Daddy look a 7". Then I got to looking around and noticed that a lot of the older trees have limbs growing funny and the tree right above this stone is growing crooked and the limbs are all twisted up. There is an old rock house foundation w a concrete floor still there and a stacked stone wall on the hill like maybe a garden wall or something I have found some names and initials carved in the limestone. Any advice on this stone will be greatly appreciated.