ous ▁material ▁consist ▁of ▁vol can ic ▁rocks ▁as ▁well ▁as ▁re transport ated ▁m oll usc ▁shell s . ▁The ▁aut och th on ous ▁material ▁is ▁chief ly ▁made ▁of ▁s ands , ▁gra vel ▁and ▁pe at . ▁ ▁After ▁exam ining ▁several ▁artifact s ▁found ▁on ▁the ▁coast ▁of ▁the ▁Val div ia ▁and ▁Con cep ción ▁areas , ▁arch ae ologist ▁M eng hin ▁claimed ▁the ▁find ings ▁belong ▁to ▁a ▁" Ch an cha ense ▁Complex " ▁or ▁culture ▁extending ▁from ▁Qu iri qu ina ▁Island ▁( 3 7 ° ▁S ) ▁in ▁the ▁north ▁to ▁T ierra ▁del ▁Fu ego ▁( 5 5 ° ▁S ) ▁in ▁the ▁south . ▁The ▁inhabitants ▁of ▁Chan - Ch an ▁had ▁access ▁to ▁a ▁substantial ▁divers ity ▁of ▁rocks , ▁with ▁sch ists , ▁bas alt , ▁quart z ▁and ▁ch ert ▁being ▁found ▁close ▁to ▁or ▁at ▁the ▁arch ae ological ▁site . ▁The ▁inhabitants ▁of ▁Chan - Ch an ▁had ▁even ▁grey ▁obs id ian ▁from ▁Ch ait én ▁Vol cano , ▁located ▁ 4 0 0   km ▁south ▁of ▁Chan - Ch an . ▁As ▁of ▁ 2 0 0 5 , ▁ 3 4 8 4 ▁stone ▁hand craft s ▁and ▁ 1 2 , 0 5 0 ▁car ve ▁out s ▁have ▁been ▁found ▁in ▁Chan - Ch an ▁as ▁well ▁as ▁b ones ▁from ▁m amm als , ▁birds ▁and ▁fish es ▁apart ▁from ▁m idd ens ▁of ▁marine ▁in verte br