jo ining ▁sub r anges ▁of ▁the ▁All g äu ▁Al ps ▁to ▁the ▁south . ▁The ▁mountains ▁consist ▁of ▁four ▁rock ▁groups . ▁In ▁the ▁northern most ▁rid ges ▁mol asse ▁is ▁dominant . ▁In ▁places ▁fly sch ▁is ▁represented , ▁as ▁is ▁main ▁dol om ite . ▁And ▁finally , ▁there ▁are ▁the ▁Sch rat ten ▁lim est ones ▁of ▁the ▁C ret ace ous ▁period ▁on ▁the ▁Gr ü nten , ▁making ▁it ▁a ▁ge ological ▁relative ▁of ▁the ▁H oh er ▁If en . ▁ ▁T ann heim ▁Mountains ▁ ▁The ▁subgroup ▁of ▁the ▁T ann heim ▁Mountains ▁( T ann heimer ▁Ber ge ) ▁was ▁still ▁counted ▁in ▁the ▁first ▁half ▁of ▁the ▁last ▁century ▁as ▁an ▁independent ▁mountain ▁range ▁in ▁the ▁Northern ▁Lim estone ▁Al ps . ▁In ▁places ▁the ▁name ▁" V ils ▁Al ps " ▁( V il ser ▁Al pen ) ▁was ▁common . ▁Only ▁later ▁was ▁it ▁considered ▁part ▁of ▁the ▁All g äu ▁Al ps . ▁The ▁highest ▁mountain ▁is ▁the ▁Kö ll ens pit ze , ▁. ▁The ▁broad ▁T ann heim ▁valley ▁clearly ▁separ ates ▁the ▁T ann heim ▁Mountains ▁from ▁the ▁rest ▁of ▁the ▁All g äu ▁Al ps . ▁There ▁are ▁ge ological ▁differences ▁too . ▁Wh ilst ▁large ▁areas ▁of ▁the ▁All g äu ▁Al ps ▁are ▁made ▁of ▁brit t le ▁main ▁dol om ite ▁or ▁Jur ass ic ▁rocks ▁of ▁the ▁All g äu ▁B eds ▁which ▁must ▁also ▁be ▁carefully ▁handled , ▁W etter