华北板块南部寒武系底部辛集组遗迹化石及其时代意义  

TRACE FOSSILS FROM THE BASAL CAMBRIAN XINJI FORMATION IN SOUTHERN NORTH CHINA PLATE AND ITS CHRONOLOGICAL SIGNIFICANCE

作　　者：苗兰云 朱茂炎[2] 

机构地区：[1]中国科学院大学,北京100049 [2]现代古生物学和地层学国家重点实验室,中国科学院南京地质古生物研究所,南京210008

出　　处：《古生物学报》2014年第3期274-289,共16页Acta Palaeontologica Sinica

基　　金：国家重点基础研究发展规划项目(973项目)(2013CB835000);国家自然科学基金(40930211;41372021)联合资助

摘　　要：首次详细描述了河南省石门沟、阳坡和山西省水峪等3条剖面寒武系底部辛集组中的遗迹化石。遗迹化石主要产出于辛集组的近底部层位,以水平管状遗迹化石为主,共计8遗迹属,12遗迹种(含3个未定种),包括Arenicolites sp.,Didymaulichnus lyelli,Gordia marina,Helminthopsis abeli,Helminthopsis sp.,Palaeophycus striatus,Palaeophycus tubularis,Phycodes sp.,Planolites beverleyensis,Planolites montanus,Treptichnus pedum与Treptichnus pollardi,此外还有2枚属种未定的遗迹化石。这一遗迹化石组合属非典型的Cruziana遗迹相,形成于盐度正常的潮下带砂质软底环境。通过对寒武纪早期管状遗迹化石Palaeophycus与Planolites直径大小的统计与分析,推测辛集组下部地层的时代不早于沧浪铺期。Trace fossils from the lower Cambrian Xinji Formation are described for the first time in Shimengou and Yangpo sections of Henan Province, and Shuiyu section of Shanxi Province. Ichnofossils from the basal part of Xinji Formation, mostly represented by horizontal cylindrical burrows, consist of 8 ichnogenera, 12 ichnospecies, namely, Arenicolites sp. , Didymaulichnus lyelli, Gordia marina, Helminthopsis abeli , Helminthopsis sp. ,Palaeophycus striatus , Palaeophycus tubularis , Phycodes sp. , Planolites beverleyensis , Planolites rnontanus, Treptichnus pedurn and Treptichnus pollardi, and 2 unnamed trace fossils. This trace fossil assemblage belongs to the atypical Cruziana ichnofacies, and was formed in sandy soft substrates in subtidal environment with normal salinity. According to the staticstics data on the diameters of Palaeophycus and Planolites of early Cambrian, the lower part of Xinji Formation is probably not earlier than the Canglangpuan Stage.

关 键 词：遗迹化石 辛集组 寒武系 华北 

分 类 号：Q911.2[天文地球—古生物学与地层学]