▁makes ▁up ▁the ▁middle ▁part ▁of ▁the ▁K eller wald , ▁and ▁the ▁K eller ▁( also ▁known ▁as ▁the ▁H oh er ▁K eller ▁or ▁the ▁H oh er ▁K eller wald , ▁a ▁mountain ▁r idge ▁in ▁the ▁south ▁of ▁the ▁K eller wald ) ▁made ▁up ▁of , ▁from ▁south west ▁to ▁n ortheast , ▁Je ust ▁( 5 8 5   m ▁above ▁sea ▁level ), ▁W üst eg arten ▁( 6 7 5   m ), ▁H uns r ück ▁( 6 3 6   m ) ▁and ▁Sau k li ppe ▁( 5 8 4   m ). ▁ ▁History ▁ ▁Ge ology ▁ ▁Ge olog ically ▁the ▁K eller wald , ▁made ▁up ▁mainly ▁of ▁p ala e oz o ic ▁rocks , ▁belongs ▁to ▁the ▁R hen ish ▁S late ▁Mountains . ▁Sc en ically , ▁however , ▁it ▁is ▁also ▁grouped ▁as ▁a ▁separate ▁entity ▁with ▁the ▁H ess ian ▁Bas in , ▁because ▁the ▁rivers ▁E der ▁and ▁It ter ▁form ▁a ▁natural ▁boundary . ▁Import ant ▁rock ▁types ▁include ▁the ▁so - called ▁K eller wald ▁quart z ite , ▁radi olar ian ▁rock , ▁sh ale , ▁gre yw ack e ▁and ▁di abase . ▁A ▁regional ▁peculiar ity ▁is ▁the ▁dark ▁red ▁K eller wald ▁ag ate , ▁an ▁E is enk ies el , ▁a ▁" qu art z ▁that ▁is ▁turned ▁op aque ▁red ▁with ▁h emat ite ▁inclus ions ". ▁ ▁Name ▁origin ▁ ▁The ▁K eller