Mr Milne stated, that, in the gully situated between Arthur Seat and Sampson's Ribs, a great extent of rock had been recently exposed (by the removal of clay and other superficial deposits) which was found to be smoothed as well as furrowed or scratched.

The gully is about 30 feet wide, at the lowest level to which it has been hollowed out, and at one part, both of its sides are composed of these smoothed furrowed rocks; but, in general, it is only on one side, viz., that next to Arthur Seat, that rock exists. There, the appearances of smoothing and rutting extend for about 80 yards.