Devil's Mouth Cross-Ridge Dyke lies between Cardingmill Valley and Townbrook Valley. The dyke is long, but is cut though by the Burway road and a small car park, of the dyke is now missing. Both ends of the dyke end on steep slopes! It was built with stone and earth, and is wide, and high, with shallow ditches either side. It is roughly 1,500 years old. It was probably built to control the access along the ancient east to west route, which still crosses the Long Mynd today by means of a modern road.