Fig. 8From: Bioturbation of Thalassinoides from the Lower Cambrian Zhushadong Formation of Dengfeng area, Henan Province, North ChinaStratigraphic variation in concentrations of Baex, Cu, Ni, and Sr/Ca ratios of the Zhushadong Formation samples. Baex = Batotal−Altotal × (Ba/Al)AUCC (Xiang et al. 2017). BI = Bioturbation IndexBack to article page