a significant source whilst abandoned millstones can be seen below the edges at Stanage, Froggatt and Baslow. Bramley Fall stone is a notable type of Millstone Grit sourced from around the village of Bramley, near Leeds. Some of the sandstones serve as aquifers into which numerous wells and boreholes have been sunk to provide local water supplies. Crushed gritstone is also used as aggregate in path and road construction. Rock climbing The gritstone edges of West Yorkshire and the Peak District provide one of the classic areas in Britain for rock climbing. Public access to these edges for climbing developed at much the same time as access for walkers to the moors of the Pennines was established during the first half of the twentieth century. Their proximity to large centres of population resulted in their rapid development as climbing venues. References Secondary sources Sandstone in the United Kingdom Geology of the United Kingdom Stratigraphy of the United Kingdom Carboniferous System of Europe