Rock Markings

Not much to comment on here, but these rockmarkings are interesting. Both examples are near the "turtle formation."


Select the above picture, the enlarged version has some very clear "dots" on it. Is there a way this would happen naturally? I don't know.


There's little doubt this one is man made, though. But made by whom? And why?


If it's of any relevance,nearby was this arrangement of boulders, similar to others I've seen around here: