I don't recall ever mentioning this rock was made by a skilled craftsmen. My thoughts are it was slightly touched to enhance the image or effigy of a mans head. Yes effigy, by definition is a sculpture or image of a person. That is certainly the case here, craftmens touch or not. many posters have agreed that it was probably touched and discarded or whatever. I don't think it was discarded. I found this piece in an old Indian camp where I have found ancient fire pits , cooking rocks, scrapers, arrowheads, scribes, hammer stones, blades and tons of flakes. Context has a lot to do with it, right? I'm no expert, I just see an effigy of a mans head and thought it was interesting. Don't be so offended. The piece resembles a mans head, more so than the piece your showing above. IMO.