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本文列述的牙形刺化石,采自四川綦江观音桥宝塔组。样品分析鉴定结果,共计26属 44种,其中2个新种,1个是多分子器官属种。找到了可以进行洲际对比的晚奥陶世的带化石 Amorphognathus ordovicicus Branson & Mehl,1933;同时发现了许多欧美晚奥陶世牙形刺的典型分子。将本组及十字铺组牙形刺化石与国外进行初步对比的结果,本区中晚奥陶世的界线应在阿什及尔阶与克拉道克阶之间 Pleurogratus linearis 笔石带的中部。
This article lists the conodont fossil, collected from the Guanyinqiao Pagoda in Qijiang, Sichuan. The results of sample analysis and identification, a total of 26 genera and 44 species, of which two new species, one is a multi-organ species. Found the late Ordovician fossil Amorphognathord ordovicicus Branson & Mehl (1933), which can be used for intercontinental comparison. At the same time, it found many typical molecules of Late Ordovician conodonts in Europe and the United States. Based on the preliminary comparison between this group and the Orthodox conodont fossils in foreign countries, the boundary of middle-late Ordovician in this area should be in the middle of Pleurogratus linearis petroglyphs between Ashgir and Kladdock.