Stratigraphic succession and regional geological sketch of the study area. According to Li et al. (2019, 2020) and Geng et al. (2020). (IMAGE)
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(a) Stratigraphy and age of the Meso-Neoproterozoic in the Yanshan-Liaoning area; (b) regional geological sketch and location of the study area; (c) figure denoting enlarged section from the study area denoted by red box. From east to west, the sections are: 1, Liujiang section, Qinhuangdao, Hebei Province (Teng and Sun, 1999; Xu, 2015); 2, Zhaozhuang section, Tangshan, Hebei Province (Chen, 1981); 3, Kuancheng section, Hebei Province (measured section); 4, Jixian section, Tianjin (Tian et al., 1990); 5, Miyun section, Beijing (measured section); 6, Longshan section, Changping, Beijing (Qi et al., 1999; Zhang et al., 2020); 7, Xishan section, Beijing (Qiao, 1976; Zhang C et al., 2017); 8, Zhaojiashan (and Liangjiazhuang) section, Huailai, Hebei Province (measured section); 9, Xiahuayuan section, Xuanhua, Hebei Province (Song and Zhang, 1983).
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