关键词: 北京猿人遗址；钙板；铀系年代

Abstract: This paper presents the U-series dating of two calcite samples taken from a traavertinlayer interstratified in 1--2 layer at Locality 1 of Beijing Man Site. The reli-ability of the obtained results is supported by following evidences:The results oftwo samples are consistent within thestatistical error of+ 1o and their 230^Th/234^Uratios all near to equilibrium; Three parallel 230^Th/234^U age determinations of BZC-3 give consistent results; Concordance between 230^Th/234^U and 227^Th/230 ^Th ages indicatesa closed system of BZC-3. Based on the weighted mean of isotopic ratiosof three230Th/234Uanalyses of BZC-3, the upper age limit of Beijing Man Site should be(42±-5^11) x 10^4 years.

Key words: Beijing Man Site; Travertin layer; U-series age