Fig. 2From: Growth mechanisms and environmental implications of carbonate concretions from the ~ 1.4 Ga Xiamaling Formation, North ChinaCorrelation of different subdivision schemes for the Xiamaling Formation in outcrop Zhaojiashan and Huangtugang sections and drillcore Jizhentun section used by different authors (Tang et al. 2017, 2018; Wang et al. 2017). The interval studied in this paper is in the Member IV or Unit 1Back to article page