And yet their markers consistantly look like something you must know before you look at it.
They only created the markers to others with knowledge of their markers could find the area. The beginning of the marker trail would have had large, obvious markers. The closer you get to the mine/treasure, the less visible and obvious the markers would be, also the smaller in size. The initial markers were meant to be seen for miles. They wanted other map makers to be able to find the mine in the event that whoever made these markings died or whatever. Also, the king required it, so if the persons working the mine were killed or died, they could send others to retreive the mine/treasure.
I think this rock is natural personally. The nostrils and upper lip are great looking, but that's it. Maybe it would look different from some other angels, and different times of day.
The real question here is, what else is near by? Does this marker lead somewhere? It's possible this was man made, but it would have to be part of a bigger picture. If there's nothing else nearby, or this dosen't lead to a trail/more markers/etc, then it's just a freak of nature.
I would really be interested to see what is up the nose more, to the top right of the picture. Are there ears/eyes up there?
BTW, my wife said it looks like a dragon.