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在辽宁省葫芦岛地区的寒武系中发现了由Treptichnus pedum,Planolites montanus和Palaeophycus heberti构成的遗迹化石组合。Treptichnus pedum分布于馒头组上部石英细砂岩中,其特征符合曳鳃动物的摄食遗迹,说明曳鳃动物是当时这一地区底栖宏体动物群落的主要组成部分。结合该群落在整个华北地台广泛出现于馒头组上部的情况,其兴起可能是一次区域性底栖环境良化事件的结果。Planolites montanus和Palaeophycus heberti出现在张夏组上部中、薄层灰岩中,位于剖面上最早出现的一层风暴沉积和一中厚层叠层石之间,表明其形成时海盆水循环较好,水动力较强,底层水和底质氧气较为充足,适宜底栖生物的生存。
In the Cambrian Department of Huludao in Liaoning Province, trace fossil assemblages of Treptichnus pedum, Planolites montanus and Palaeophycus heberti were found. The Treptichnus pedum is distributed in the upper quartz sandstone of the Mantou Formation and is characterized by the feeding relics of the trailing gills, indicating that the trailing gill animal was the main component of the macrobenthic fauna in the area at that time. In combination with the fact that the community occurs widely in the upper part of the breadstalk over the entire North China platform, its rise may be the result of a well-occurring event of regional benthic environment. Planolites montanus and Palaeophycus heberti appear in the middle and thin layers of limestone in the upper part of Zhang-Xia Formation, between the earliest stratospheric sediment and a medium-thick stratum in the profile, indicating that the seawater circulation is better and hydrodynamic Strong, the bottom of the water and sediment oxygen is more adequate for the survival of benthic organisms.