I know of 2
1 is over in Hamden near the new haven line.
the other is on woodin st in Hamden behind iron gates. there are no stones.
there used to be a poor house for new haven up the hill and when they passed I guess most went to the potters field
I understand that new haven wants to make a road through it for easy acess to Hamden and if they do, I am going to protest.
hope im not too late with this info