The road was built at the beginning of the 1800s and was subsequently relaid until local authorities closed it in 1979. Įvidence for the continued movement of the slide mass is demonstrated graphically by the severe damage to the old Mam Tor road that traversed this flow. Indeed, three larger landslides occur on the north side of Mam Tor, one of them cutting the main ridge at Mam Nick which allows a minor road over into Edale another creates the striking crag of Back Tor well seen from Mam Tor. The landslide is due to weak shales underlying sandstones, a common phenomenon all around the Dark Peak, notably at Alport Castles, Longdendale, Glossop and Canyards Hills, Sheffield. This rotational landslide began roughly 4,000 years ago. Ī feature of Mam Tor is the active landslide which invades its southeast side almost to the summit, and interrupts the ramparts of the hillfort, unless its builders used it as part of the defences. Simon Jenkins rates the panorama from Kinder Scout to Stanage Edge as one of the top ten in England. Mam Tor was declared to be one of the Seven Wonders of the Peak by Thomas Hobbes in his 1636 book De Mirabilibus Pecci. At the base of the Tor and nearby are four show caves: Blue John Cavern, Speedwell Cavern, Peak Cavern and Treak Cliff Cavern where lead, Blue John, fluorspar and other minerals were once mined. The hill is crowned by a late Bronze Age and early Iron Age univallate hill fort, and two Bronze Age bowl barrows.
In 1979, the continual battle to maintain the A625 road ( Sheffield to Chapel en le Frith) on the crumbling eastern side of the hill was lost when the road officially closed as a through-route, with the Fox House to Castleton section of the road being re-designated as the A6187. These landslips, which are caused by unstable lower layers of shale, also give the hill its alternative name of Shivering Mountain. Its name means "mother hill", so called because frequent landslips on its eastern face have resulted in a multitude of "mini-hills" beneath it. Mam Tor is a 517 m (1,696 ft) hill near Castleton in the High Peak of Derbyshire, England.
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