The true is that I found this stone totally accidentally and all the information I have collected after my visit. A few sources talk about other similar stones within distance of 20m approx but I did not see them so I cant help.
There is a theory about destroyed dolmen or more complex structure...though it still remains just a theory. Some sources classify this object as a medieval cross stone or propitiatory stones. But I have seen plenty of such objects in this region and this particular one seems to be quite different in my oppinion. I would say the stone is old and was christianized with the carving of the cross what is by the way quite usual.
Something is not right. This message is just to keep things from messing up down the road