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本文描述的西梁寺组和大田坝组牙形石共计24属24种。其动物群面貌相似于西欧和北欧波罗的海地区动物群面貌。大田坝组至西梁寺组可划分为2个牙形石带和1个牙形石组合带,从上而下为: 3.Prioniodus varabilis 带 2.Pygodus serrus-Prioniodus alatus 带 1.Microzarkodina flabellum 带大田坝组产有 pygodus serrus,Prioniodus alatus P.varioniodus 等多分子器官属种。西梁寺组产有 Microzarkodina,flabellum 等多分子器官属种。根据牙形石化石同国内外对比结果,初步确定西梁寺组的时代属阿伦尼格(Arenigian)阶上部,大田坝组相当兰代洛(Llandeilian)阶及克拉道克(Caradocian)阶下部。
The total 24 genera and 24 types of conodont in Xiliangsi Formation and Datianba Formation described in this paper are. Its fauna resembles that of fauna in the Baltic Sea regions of Western and Northern Europe. The Datianba to Xiliangsi Formation can be divided into two conodont zones and one conodont assemblage, from top to bottom: 3. Prioniodus varabilis 2.Pygodus serrus-Prioniodus alatus 1.Microzarkodina flabellum Daejeon Dam produces pygodus serrus, Prioniodus alatus P.varioniodus and other multi-organ species. Xiliangsi group produced Microzarkodina, flabellum and other multi-organ species. According to the results of the comparison between conodont fossils and those in the world, the age of the Xiliangsi Formation is initially identified as the upper part of the Arenigian, the equivalent of the Llandeilian and Caradocian orders .