Ok found another, this time its definitely of age, and looking at the shadowing and the structure, looks like it could be man made, its approx 40 meters in length, so the wall width would be about 2 feet and judging by the shadowing about 3-4 ft in height. Need the trained eye for thoughts on this one! have converted to different style layers to try to give you a better picture, if you would like it larger or more from a distance please let me know, but as SPECULATION, to me looks artificial. What do you think?