Storm deposits and relevant trace fossils from the Cambrian Series 2 Xinji Formation in Lushan area, Henan Province
Bai Wan-Bei1, 2, Qi Yong-An2, Guo Ying-Hai1, Wang Min2, Qing Guo-Shuai2
1 School of Resources and Earth Science,China University of Mining and Technology,Xuzhou 221116,Jiangsu; 2 School of Resources and Environment,Henan Polytechnic University,Jiaozuo 454000,Henan
Abstract：The Cambrian Series 2 Xinji Formation,a suit of siliciclastic stratum with phosphorus and glauconite deposits influenced by storm processes in Lushan area,Henan Province,mainly consists of medium- to thick-bedded quartzose sandstones and alternations of very thin-bedded mudstones and sandstones. Abundant trace fossils were preserved within cross-bedded sandstones and bedding planes between very thin-bedded mudstones and sandstones in the lower part of the formation. Skolithos sp. belongs to opportunistic trace fossil (r-selected) of Skolithos ichnofacies formed at weakening stage of the storm, dominated by short vertical dwelling burrows and low ichnodiversity and ichnoabundance. Palaeophycus tubularis,P. striatus,Taenidum sp.,Gordia marina,Planolites montanus and P.beverleyensis belong to equilibrium trace fossils(K-selected)of Cruziana ichnofacies formed during interludes between storms,which are dominated by the horizontal feeding and grazing burrows with medium ichnodiversity and ichnoabundance. The low ichnodiversity reflects dominance of the storm events with short duration of interludes which prevented the continuous colonization of substrates. The particular storm process and relatively poor burrowing ability of trace makers during the Early Cambrian may have led to the lower ichnodiversity and inchoabundance in storm deposits in study area in comparison to that during the time after Cambrian.
Bai Wan-Bei,Qi Yong-An,Guo Ying-Hai et al. Storm deposits and relevant trace fossils from the Cambrian Series 2 Xinji Formation in Lushan area, Henan Province[J]. JOPC, 2018, 20(3): 365-376.
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