The White Peak area of the Peak District is named after the limestone plateau landscape of the 'Derbyshire Dome' anticline. The plateau is generally between 200m and 300m above sea level. This limestone outcrop is surrounded on the west, north and east by a horseshoe-shaped formation of younger sandstones (gritstones) and shales, known as the Dark Peak. The town of Buxton is at the western edge of the limestone region. The Triassic sandstones of the Midlands plain bound the south edge of the limestone region. The other main karst landscapes of England are the Yorkshire Dales and the Mendip Hills.