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1 IntroductionGanqianCave ( 1 0 9°0 5′1 4″E ,2 4°1 3′2 2″N)islocatedinTuboDistrict,LiujiangCountyinsouthernChina sGuangxiZhuangAutonomousRegion ,~ 35kmwest southwestfromLiuzhouCityand~ 30kmwestoftheTongtianyancavewheretheworld renownedlateHomosa