Hi Alex. That is a great find there. Here is what I see. 1) A turtle made up of the composite of of stones by them selves to the left of the cross. 2) A cross with a longer right arm. 3) A duck on the end of the right arm. 4 A rabbit in the center. and three white stones in the lower leg of the cross.
There may be some other things in the pic as well. I would pay attention to the 3 white stones. pics from different angles may help. best of luck.
Hi Alex. Even if it is a grave marker, that is a symbol and has an interpretation. Boy that will hack off some of pros or should I say Sentinels of forbidden knowledge. Here is a mark up of your pic. it is my honest opinion that you have a verified monument. You have 12 known symbols in this pic.
your second pic has alot going on. I am not going to mention all that on an open forum.
Hi Alex. I have been studying your pic some more. Sorry, I miss identified a couple of symbols on that markup. What I first thought was a flying bird is really a rabbit. What I thought might be a black hart is actually a rabbit hole. best of luck.