Yes, I found a ceremonially deposited hammerstone once, buried point upward in what-was-then peaty topsoil, near to a cupmarked stone and a possible stone circle. By handling the hammerstone - it's recorded - I've been able to infer a great deal about the stone monument makers. It was a hammerstone that was used to dress and shape the stones, when they were altered. Phenomenal strength and endurance would have been needed for the simplest of operations. Arthritis would have been early and painful!