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石。该遗迹群落为:Cochlichnus,Cosmorhaphe,Chondrites,Gordia,Glockeria,Huaxich-nus,Oldhamia,Phycosiphon,Protopaleodictyon,Pinnatpedus,Mammillichnus,Neoneriles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。
Abstract:
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.
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