Acorrding to the excavation report , in t | and t2 of zhangkou cave , there are 10 flowstone layers , which provide favorable materials for chronological studies 张口洞文化堆积中夹有多层钙板，这为该遗址的年代研究提供了有利条件。
2.
The cultural deposits which are bracketed by the two flowstone layers should be of an age between 55 and 110 ka . the sixth flowstone layer gave date of 300 ka , which is much too old compared with the previous 14c age of - 15 ka on fossil materials 第4 、 5钙板层间出土的石制品应是中国地区40 - 100ka间有人类活动的确证，表明“时间缺环”很可能只是测年技术应用不当造成的假象。
3.
We have carried out 230th / 234u dating on several intercalated calcite samples . the results show that the capping flowstone layer and the second one are holocene in time . the fourth flowstone layer is of an age of 55 ka , and the fifth one 110 ka 新生碳酸盐铀系法测年显示，张口洞堆积所代表的时间跨度比原认为的长得多，这一结果支持我国中、晚更新世人类遗址原有年代框架被总体压缩的观点。
4.
2s ( th / u4u and 227th / 2x " th dating on two mammal fossil teeth gave age ranging from 85 to 139 ka , which evidence the stratigraphic order between the capping flowstone and the underlying fossil - bearing deposits and support to the age assignment of older than ca . aoo ka to die hominid fossil teeth 伴生的貘牙化石和鹿牙化石的二种铀系法年代范围为85 - 139ka ，表明该地点含化石堆积与表层钙板间无地层倒序现象，支持人牙化石大于100ka的结论。
5.
We have carried out th / u dating on intercalated calcite samples . the results show that the capping flowstone layer is of an age of 94 ka , and the second one 220 ka . the fossil - bearing deposits which are bracketed by the two flowstone layers should be of an age between 94 and 220 ka 新生碳酸盐岩与骨化石的铀系测年结果表明：该地点覆盖含人牙化石堆积的表层钙板在约94ka以前开始形成，堆积叠压的钙板年代为约220ka ，人牙化石的年代应介于两者之间。
