look at the coat of arms on the internet, it may be welch, spanish or french, it depends on the location of this carving, not sure. in the old days of solders fighting with shield and sword and of high rank, they would mark the location of there burial by some type of symbol. normally the possesions and his sword/shield would be placed on top of his body as a sign of respect. if it is carved on a flat serface, it may be a trail marker saying we stopped here and follow one of the points on the carving. check where north is related to the carving. also, if it is flat, you will need to follow all points to see where they led and if you use topo/Ariel maps it may show an old trail, cave, or a good camping area. not knowing the state makes harder to make guess.