Conodonts across the Lochkovian/Pragian boundary in central Guangxi, South China

doi:10.1016/j.palwor.2023.11.002

NIGPAS OpenIR

	Conodonts across the Lochkovian/Pragian boundary in central Guangxi, South China
通讯作者	Lu, Jian-Feng([email protected])
	Lu, Jian-Feng
	2024-10-01
发表期刊	PALAEOWORLD
ISSN	1871-174X
卷号	33 期号:5 页码:1268-1280
摘要	The Lochkovian and Pragian (Lower Devonian) in the South China Block are mainly represented by siliciclastic rocks that were deposited soon after the end of the Kwangsian Orogeny during the Silurian-Devonian transition. The Pragian conodonts in the South China Block have been poorly documented, and the Lochkovian/Pragian boundary, defined by the first appearance of the conodont Eognathodus irregularis, has never been successfully demonstrated. The present study provides new evidence by restudying conodonts from the Gaoling Member of the Nahkaoling Formation at the Lingli section, central Guangxi. In addition to the previously reported Zieglerodina? tuojiangensis Lu in Lu et al., Pandorinellina exigua lingliensis Lu in Lu et al., and Pandorinellina exigua exigua (Philip) by Lu et al. (2023), the conodont record is expanded to include Pseudooneotodus beckmanni (Bischoff and Sannemann), E. irregularis (Druce), E. grandis n. sp., and Eognathodus sp. A. With the lowest occurrence of E. irregularis in sample 21LL-21, the Lochkovian/Pragian boundary at the Lingli section is located at a level approximately 17.29 m above the base of the Nahkaoling Formation. This is for the first time that the Lochkovian/Pragian boundary is precisely documented in the South China Block. Above this level the strata from sample 21LL-21 to sample 21LL-46 can be correlated with the lower Pragian irregularis-profunda Zone. Moreover, the appearance of the newly described species, E. grandis n. sp., from the irregularis-profunda Zone in the Nanning-Liujing district suggests that the development of a well-arranged median longitudinal row of nodes, previously treated as the most important morphological change in the evolution from Eognathodus Philip to Polygnathus Hinde during the middle Pragian, in fact, can be dated back much earlier to the early Pragian. Accordingly, the derivation of Polygnathus from Eognathodus during the Pragian needs further investigation. (c) 2023 Elsevier B.V. and Nanjing Institute of Geology and Palaeontology, CAS. All rights are reserved, including those for text and data mining, AI training, and similar technologies.
关键词	Conodonts Lower Devonian Nanning-Liujing district Nahkaoling Formation eognathodids
DOI	10.1016/j.palwor.2023.11.002
收录类别	SCI
语种	英语
关键词[WOS]	LOWER DEVONIAN CONODONTS
资助项目	National Natural Science Foundation of China[42372029] ; National Natural Science Foundation of China[41702009] ; Youth Innovation Promotion Association Chinese Academy of Sciences
WOS研究方向	Paleontology
WOS类目	Paleontology
WOS记录号	WOS:001355217000001
项目资助者	National Natural Science Foundation of China ; Youth Innovation Promotion Association Chinese Academy of Sciences
出版者	ELSEVIER
文献类型	期刊论文
条目标识符	http://ir.nigpas.ac.cn/handle/332004/44682
专题	中国科学院南京地质古生物研究所
通讯作者	Lu, Jian-Feng
作者单位	Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, Nanjing 210008, Peoples R China
第一作者单位	中国科学院南京地质古生物研究所
通讯作者单位	中国科学院南京地质古生物研究所
推荐引用方式 GB/T 7714	Lu, Jian-Feng. Conodonts across the Lochkovian/Pragian boundary in central Guangxi, South China[J]. PALAEOWORLD,2024,33(5):1268-1280.
APA	Lu, Jian-Feng.(2024).Conodonts across the Lochkovian/Pragian boundary in central Guangxi, South China.PALAEOWORLD,33(5),1268-1280.
MLA	Lu, Jian-Feng."Conodonts across the Lochkovian/Pragian boundary in central Guangxi, South China".PALAEOWORLD 33.5(2024):1268-1280.