Conodonts from the Upper Ordovician Koumenzi Formation in the Lenglongling area of the North Qilian Mountains are reported for the first time.Five genera and nine species of conodonts have been identified,including two undetermined species.On the basis of the characteristics of conodont fossil succession,a conodont assemblage has been established:the Aphelognathus grandis-Panderodus gracilis assemblage.We compared the conodont assemblages of the Koumenzi Formation with those at the same stratum at home and abroad.Combined with other fossil data for the Koumenzi Formation,the author concluded that the age of the Koumenzi Formation is the Kaidi-Middle Hernandian period,which is equivalent to the Late Aijiashan-Middle Qiantangjiang stage in the Chinese stratigraphic chronology.
关键词
北祁连/晚奥陶世/扣门子组/牙形石组合
Key words
North Qilian/Late Ordovician/Koumenzi Formation/conodont assemblage
万方数据