After much speed reading of books. I think these markings are from artillery shells and rifle bullets. From the book The Peak District Landscapes Through Time by John Barnatt and Ken Smith. 2004. On page 9 is a map showing 1939-45 artillery platforms on Gardom's Edge. On page 130 is a picture of a rock outcrop near Swine Sty indicating Motar fragmentation damage. These outcrops and standing stones was used by the American Airborne Division and the Home Guard for practice.
Something is not right. This message is just to keep things from messing up down the road