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蓬莱滩剖面的牙形刺最早是由Ｍｅｉｅｔａｌ．（１９９４ｃ）研究的。本文重点讨论了蓬莱滩剖面吴家坪阶和茅口阶界线层的牙形刺，对有关牙形刺种的时限、分带及层位提出了一些不同的看法。本文着重指出，吴家坪阶的底界在茅口组的最上部，即在１８层上部２ｍ厚的浅水相灰岩内部通过，至少比１８层顶低０．５５ｍ，不应把吴家坪阶底界划在１８层与１７层之间，它比事件地层界线稍高，与吴家坪组和茅口组的界线并不一致。所谓“最佳自然界线”的概念，在蓬莱滩剖面并不能得到证实。Ｊｉｎｏｇｏｎｄｏｌｅｌａ和Ｐｓｅｕｄｏｃｌａｒｋｉｎａ属名无效。
The conodont of Penglai Beach profile was originally from Meietal. (1994c) studied. This article focuses on the conodont of the Wujianping and Maokou boundary lines in the Penglaokan section, and puts forward some different opinions on the time limit, zonation and horizon of the condylomatae. This paper emphasizes that the bottom boundary of the Wujiaping Formation passes through the uppermost part of the Maokou Formation, that is, within 2m thick shallow-water limestone above the 18th floor, at least 0.55m below the top of the 18th floor. Therefore, the bottom boundary of Wujiaping Between the 18th and 17th floors, it is slightly higher than the boundary of the event stratigraphy and is not consistent with the boundaries of the Wujiaping and Maokou formations. The so-called concept of “best natural line” can not be confirmed at Penglai Beach profile. Genus names Jinogondolela and Pseudoclarkina are invalid.