Lower Emsian (Lower Devonian) conodont succession in Nandan County, Guangxi Province, South China

Lower Emsian (Lower Devonian) conodonts from southwestern and central Guangxi, South China: Implications for palaeogeographic reconstructions

“…Y. Wang, Chen, & Kuang, 2016). For much of Guangxi (excluding the Qinfang Trough and the northeastern region), southeastern Yunnan, and the Longmenshan area of Sichuan, the onset of carbonate sediments during the Early Devonian transgression usually lies in a certain level of the excavatus Zone (Guo et al, 2018).…”

“…In Nandan area of northern Guangxi, evident sedimentary facies turnover is recorded in the Yilan Formation (Guo et al, 2015(Guo et al, , 2018. The lower and middle parts of the Yilan Formation consist of purple to brownish-yellow calcareous mudstone, grey marlstone, and nodular limestone yielding the "Spirifer" tonkinensis brachiopod fauna, a diverse neritic fauna widely distributed in the epicontinental sea of southern China during the Early Devonian (Guo et al, 2019).…”

“…In the last century, many studies on the Lower Devonian conodonts in the South China Plate were accomplished (Bai, Bai, Ma, Wang, & Sun, 1994; Bai, Jin, & Ning, 1982; Bai, Jin, Ning, He, & Han, 1979a, 1979b; Gong, 1992; Jiang, Hu, & Zheng, 1996; C. Y. Wang, 1981; C. Y. Wang et al, 1979; C. Y. Wang & Wang, 1978; Xiong, 1981), elaborating the basic conodont biostratigraphy framework of South China. In the late 2010s, more studies were carried out (Guo, Nie, & Sun, 2018, 2019; Lu & Chen, 2016; Lu, Qie, & Chen, 2016; Lu, Qie, Yu, & Chen, 2017; Lu, Valenzuela‐Ríos, Liao, & Kuang, 2018; Lu, Valenzuela‐Ríos, Liao, & Wang, 2019; Lu, Valenzuela‐Ríos, Wang, Liao, & Wang, 2019) with the purpose to better understand the Lower Devonian conodont biostratigraphy and evolution of early polygnathids and to search for the basal Emsian boundary in South China as well.…”

“…Y. Wang & Wang, 1978;Xiong, 1981), elaborating the basic conodont biostratigraphy framework of South China. In the late 2010s, more studies were carried out (Guo, Nie, & Sun, 2018, 2019Lu, Qie, & Chen, 2016;Lu, Qie, Yu, & Chen, 2017;Lu, Valenzuela-Ríos, Liao, & Kuang, 2018; with the purpose to better understand the Lower Devonian conodont biostratigraphy and evolution of early polygnathids and to search for the basal Emsian boundary in South China as well.…”

“…Due to the Early Devonian transgression, the development of carbonate sequence in South China shows an obvious northward stepwise delay (Guo et al, 2018), and thus the completeness of Lower Devonian conodont successions in different regions provides insight into the sedimentary palaeogeographic dynamics of the South China Plate. In this study, conodont biostratigraphic work was carried out on three sections in southwestern and central Guangxi (Figure 1a), namely the Poyuan section of Tiandeng County, the Shangkou section of Jingxi City (Figure 1c), and the Menggong section of Guigang City (Figure 1b).…”