8 4 9 ▁living ▁in ▁the ▁town . ▁ ▁Indust rial ▁ ▁Qu ar ry ing ▁Has ling den ▁is ▁notable ▁for ▁its ▁stone ▁quar ry ing , ▁and ▁Has ling den ▁Flag ▁( a ▁quart z - based ▁sand stone ) ▁was ▁distributed ▁throughout ▁the ▁country ▁in ▁the ▁ 1 9 th ▁century ▁with ▁the ▁opening ▁up ▁of ▁the ▁rail ▁network . ▁This ▁stone ▁was ▁used ▁in ▁the ▁p aving ▁of ▁London , ▁including ▁T raf al gar ▁Square . ▁Flag stone ▁is ▁a ▁type ▁of ▁sed iment ary ▁rock , ▁relatively ▁easy ▁to ▁split ▁or ▁quar ry ▁in ▁sl abs , ▁and ▁hence ▁ideal ▁for ▁p aving . ▁Loc ally ▁it ▁is ▁also ▁used ▁for ▁making ▁f ences ▁and ▁roof ing . ▁Ge olog ists ▁have ▁found ▁that ▁it ▁has ▁a ▁hard ness ▁and ▁sil ica ▁content ▁not ▁unlike ▁gran ite , ▁and ▁its ▁presence ▁was ▁the ▁main ▁reason ▁for ▁the ▁growth ▁of ▁quar ry ing ▁in ▁Ross end ale . ▁Has ling den ▁Flag ▁is ▁unique ; ▁two ▁other , ▁common ▁types ▁of ▁flag stone ▁(' rough ▁rocks ') ▁are ▁found ▁throughout ▁the ▁P enn ines , ▁but ▁a ▁third ▁type ▁is ▁found ▁only ▁in ▁the ▁local ▁Has ling den ▁Fl ags . ▁ ▁Text iles ▁Like ▁much ▁of ▁East ▁Lanc ash ire , ▁Has ling den ▁has ▁a ▁long ▁association ▁with ▁the ▁text ile ▁industry . ▁From ▁the ▁ 1 6 th ▁century , ▁after ▁the ▁old ▁Forest ▁of ▁Ross end ale ▁was ▁opened ▁up ▁to ▁settlement , ▁far