摘要
贵阳地区下三叠统是一个完整的碳酸盐岩层序（相当于三级旋回层序）．该层序中的凝缩段由深色薄层（单层厚0．5cm～1cm）的泥晶灰岩和泥质条带灰岩组成．凝缩段中产丰富的遗迹化右．该遗迹群落为：Cochlichnus,Cosmorhaphe,Chondrites,Gordia,Huaxich－nus，Oldhamia,Phycosiphon.Protopaleodictyon,Pinnatpedus,Mammillichnus,Neonerites和生物扰动构造．遗迹化石组合与Nereites遗迹相相似。此外，文本还讨论了此遗迹群落的形成原因。
The Lower Triassic strata in the Guiyang district represent an uninterrupted carbon- ate sequence corresponding to the third-order cyclic sequence.The condensed sections in the carbonate sequence consist of dark alternating laminations (0.5—1 cm thick for individ- ual laminae)of micritic limestones and muddy banded limestones,where abundant trace fossils have been found,including Cochilichnus,Cosmorhaphe,Chondrites,Gordia,Gloderi- a,Huaxichnus,Oldhamia,Phycosiphon,Protopaleodictyon,Pinnatpedus,Mammillichnus, Neonerites and bioturbated structures,These trace fossil assemblages are similar to the Nereites ichnofacies.The author in this paper gives a more detailed explanation of the gene- sis of the above-mentioned ichnocoenoses.
