What's this?

Found this in the hills in South Dakota. Is this an ancient artifact?

Found this in the hills in South Dakota. Is this an ancient artifact? I’m rich? Obviously, someone drew the eye. Or not?

Answer: This is called a nodule. It can grow in different ways, but, in fact, it is a collection of solidified matter. It is likely just a deposit of minerals in rock that has dissolved over a long period of time.