ling ▁Form ation ▁contains ▁more ▁vol cano ▁derived ▁particles . ▁N any uan ▁Form ation ▁is ▁the ▁main ▁vol can ic ▁str ata ▁with ▁up ▁to ▁ 8   km ▁thick ▁of ▁intermediate ▁and ▁acid ▁vol can ic ▁la va , ▁and ▁t uff . ▁ ▁A ▁din osa ur ▁Rh yn ch osa urus ▁orient alis ▁foss il ▁has ▁been ▁found ▁in ▁this . ▁The ▁B ant ou ▁Form ation ▁has ▁paper ▁sh ale ▁and ▁mud stone ▁in ▁the ▁west , ▁and ▁t uff ▁and ▁acid ▁vol can ic ▁rock ▁in ▁the ▁east . ▁ ▁C ret ace ous ▁He kou ▁Form ation ▁contains ▁pur ple - red ▁sand stone ▁and ▁green ▁grey ▁s ilt stone ▁in ▁the ▁west . ▁ ▁Contempor ane ously ▁in ▁the ▁east ▁bas alt , ▁d ac ite , ▁r hy ol ite ▁and ▁quart z ▁tra chy te ▁along ▁with ▁sed iments ▁derived ▁from ▁these ▁make ▁up ▁the ▁Sh ima os han ▁Group . ▁In ▁the ▁Upper ▁C ret ace ous ▁the ▁Sh ax ian ▁Form ation , ▁the ▁Ch ishi ▁Form ation ▁with ▁pur ple ▁red ▁sand stone ▁is ▁in ▁the ▁west , ▁and ▁Sh ini ush an ▁Form ation ▁contains ▁con gl omer ate ▁and ▁vol can ic ▁particles ▁dated ▁from ▁ 8 8 - 9 1 ▁Ma . ▁ ▁Ne ogene ▁In ▁the ▁Pale ogene ▁surv iving ▁depos its ▁were ▁not ▁formed . ▁ ▁The ▁Fot an ▁Group ▁formed ▁with ▁Bas alt ▁and ▁con gl omer ate . ▁ ▁Vol can ic ▁rocks