Discovery of Middle Triassic Conodont Clusters from Luoping Fauna, Yunnan Province
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摘要: 通过对云南罗平中三叠统关岭组二段产罗平生物群的大凹子剖面进行厘米级牙形石样品的精细采样、处理与鉴定分析, 发现了丰富的牙形石齿串, 并拼绘出一个较完整的牙形石多分子器官属(P1、S0、S1、S2/3和M).成对的片形Neospathodiform形态分子占据P1位置; 单个指掌状的Cypridodelliform形态分子占据S0位置; 成对的Enantiognathiform、Hindeodelliform与Cypridodelliform形态分子分别占据器官属的S1、S2、S3和M位置.Abstract: Abundant conodont clusters were found after careful sampling, processing and analysis of the specimens in the Daaozi section of the second member of Guanling Formation yielding Luoping Fauna at the centimeter level. And a complete conodont multielement apparatus (P1, S0, S1, S2/3, M) was shown to us by fine identification and detailed analysis, including one pair of P1 elements (Neospathodiform), one S0 element (Cypridodelliform), pairs of S1 (Enantiognathiform), S2/S3 (Hindeodelliform), and M elements (Cypridodelliform).
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Key words:
- the second member of Guanling Formation /
- Daaozi section /
- conodont clusters /
- stratigraphy /
- Yunnan
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图 1 云南罗平大凹子剖面交通位置
Fig. 1. Location map of Daaozi section in Luoping area, Yunnan Province
图 2 大凹子剖面的牙形石齿串
图中A-C牙形石标本均放大100倍(除B1放大400倍外，B1为B的局部放大图，显示有清晰的沿齿纵向分布条纹，齿体边缘有磨蚀的痕迹).A-C为大凹子剖面规则排列的牙形石齿串组合；B为两个P1分子齿串；A、C齿串分子含有相同的组合型式，除S0分子由一个Cypridodelliform形态分子组成外，其余S1(Enantiognathiform)、S2/3(Hindeodelliform)、M(Cypridodelliform)形态分子构成都是成对的.牙形石齿串产出的层位分别是：A-第18层，B-第19层，C-第25层
Fig. 2. Conodont clusters in Daaozi section
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