▁by ▁mol asse . ▁This ▁forms ▁the ▁well ▁known ▁Nag elf lu h ▁chain ▁with ▁mountains ▁like ▁the ▁Hoch gr at , ▁the ▁R ind alph orn , ▁the ▁Stu iben ▁and ▁the ▁Ste ine berg . ▁The ▁increasing ly ▁lower ▁mountains ▁north ▁of ▁the ▁Nag elf lu h ▁chain ▁are ▁also ▁made ▁of ▁mol asse , ▁as ▁is ▁the ▁ad jo ining ▁southern ▁chain ▁around ▁the ▁Gir enk opf ▁and ▁the ▁Si pl inger k opf . ▁ ▁The ▁summ its ▁rising ▁to ▁the ▁south ▁consist ▁of ▁fly sch . ▁This ▁is ▁the ▁more ▁nor ther ly ▁of ▁the ▁two ▁fly sch ▁zones ▁in ▁the ▁All g äu ▁Al ps . ▁The ▁mountains ▁have ▁a ▁more ▁gentle , ▁rounded ▁shape . ▁As ▁a ▁result , ▁they ▁are ▁a ▁popular ▁area ▁in ▁winter ▁for ▁ski ▁and ▁snow sh oe ▁t ours . ▁The ▁best ▁known ▁mountain ▁of ▁this ▁fly sch ▁zone ▁is ▁the ▁R ied berger ▁Horn , ▁which ▁is ▁easy ▁to ▁clim b ▁from ▁the ▁R ied berg ▁Pass . ▁The ▁so - called ▁" horn s " ▁( H ör ner ) ▁- ▁the ▁O fter sch w anger ▁Horn , ▁Sig is w anger ▁Horn , ▁Rang is w anger ▁Horn ▁and ▁Bol ster lang er ▁Horn ▁- ▁also ▁belong ▁to ▁the ▁fly sch ▁zone . ▁ ▁South ▁of ▁the ▁R ied berg ▁Pass ▁the ▁rock ▁changes ▁again . ▁This ▁is ▁the ▁start ▁of ▁the ▁Sch rat ten ▁lim estone ▁of ▁the ▁ch alk ▁formation , ▁the ▁rock ▁which ▁forms