1) An ancient stone, grey with lichen, a word which occurs frequently in boundary descriptions from the Old English period.
1214-58 et dimidiam rodam ad Harestanes, Bolton Priory
1590 Item 2 harestones lying east and west, Kirby Underdale
1664 horestones alias Graystone Edge, Warley. It can be compared with 'hoar-law'
1165-77 et usque ad altum de Harelow, Newby near Clapham.