Sorry, but I don't see anything particularly unusual about that stone. I've seen a whole lot of stranger "natural" shapes and apparent designs in sandstone, limestone, many other types of stone. With some experience with fossils (my grandfather was an avid rock-hounder), fifteen years rock climbing all over the states, and decades of hunting and studying North American Indian artifacts,I think that the "cut"(s) as you put it are just due to natural erosion. I'd love to be wrong, I always look forward to seeing anyone's late great discovery, but I'm afraid this isn't it. Keep looking, who knows what you might find?