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1 IntroductionAmongthefourMiocenehominoidsitesofKaiyuan ,Lufeng ,YuanmouandBaoshaninYunnanProvinceofChina ,LufengandYuanmouaretherichestfossilsites .Sinceitsfirstdiscoveryin 1 975,manycolleaguesaroundtheworldhavebeeninvolvedinthestudyofLufengpithecusfossi