Rushup Edge is part of the ridge which extends east to Mam Tor, Hollins Cross, Back Tor and Lose Hill, separating the Edale and Hope valleys. The ridge is formed of Namurian (c320mya) age Mam Tor Beds (alternating sandstone and siltstone) and landslides on the north have formed colluvium.The Mam Tor landslide, geology & mining legacy around Castleton LAURANCE DONNELLY 2006
