NIGPAS OpenIR  > 中国科学院南京地质古生物研究所
Small shelly fossils from the early Cambrian Yanjiahe Formation, Yichang, Hubei, China
Guo, Junfeng1,2; Li, Yong1; Li, Guoxiang (李国祥)2
2014-04-01
Source PublicationGONDWANA RESEARCH
ISSN1342-937X
Volume25Issue:3Pages:999-1007
Abstract

Abundant data have been acquired on the lower Cambrian small shelly fossils (SSFs) of the Yangtze platform during the last three decades, demonstrating that these fossils are an important piece of evidence for the Cambrian radiation and are useful biostratigraphic tools for correlating the lower Cambrian. Here we report SSF associations from the Yanjiahe Formation in the Three Gorges area, South China. The Yanjiahe Formation is well exposed near the Yanjiahe village, and its 40-m-thick sequence can be subdivided on the basis of lithology into five stratigraphic intervals (beds). Small shelly fossils occur mainly in Beds 2 and 5, but abundant SSFs were discovered in thin sections of siliceous-phosphatic nodules from Bed 3 for the first time. No skeletal fossils were discovered in the basal siliceous rock interval (Bed 1), but the negative delta C-13(carb) excursion and the occurrence of the acritarch Micrhystridium regulare indicate that it belongs to the basal Cambrian. The SSF associations are somewhat similar to those of East Yunnan, and can be differentiated into three biozones (in ascending order): the Anabarites trisulcatus-Protohertzina anabarica assemblage zone (Bed 2), the Purella antiqua assemblage zone (Bed 3), and the Aldanella yanjiaheensis assemblage zone (Bed 5). The occurrence of A. yanjiaheensis in Bed 5 probably indicates that Bed 5 belongs to Cambrian Stage 2, but the Stage 2/Stage 1 boundary is uncertain since Bed 4 lacks fossils. SSF biostratigraphy indicates that the Yanjiahe Formation is pretrilobitic Meishucunian in age (equivalent to the Nemakit-Daldynian to Tommotian of Siberia, Terreneuvian). Five SSF genera occur in Bed 2, more than six genera in Bed 3, and twenty-three genera in Bed 5. The stepwise increase in generic diversity through the Yanjiahe Formation is comparable with the global diversity increase through the Nemakit-Daldynian to early Tommotian interval. (C) 2013 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.

KeywordSmall Shelly Fossils Terreneuvian Early Cambrian Yanjiahe Formation Yichang
DOI10.1016/j.gr.2013.03.007
Language英语
WOS KeywordSouth China ; Carbon-isotope ; Yangtze Platform ; Gorges Area ; Boundary ; Record ; Explosion ; Biostratigraphy ; Ediacaran ; Radiation
Funding ProjectNational Basic Research Program of China[40902007] ; Chinese Academy of Sciences[KZCX2-EW-115] ; Ministry of Science and Technology of China[2013CB837100] ; Ministry of Science and Technology of China[2013CB835002] ; China Postdoctoral Science Foundation[20100471020] ; Doctoral Fund of Ministry of Education of China[20100205110003] ; Special Fund for Basic Scientific Research of Central Colleges, Chang'an University, China[CHD2011TD005] ; Special Fund for Basic Scientific Research of Central Colleges, Chang'an University, China[CHD2011TD020] ; Special Fund for Basic Scientific Research of Central Colleges, Chang'an University, China[CHD2010JC074]
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000332429600010
Funding OrganizationNational Basic Research Program of China ; Chinese Academy of Sciences ; Ministry of Science and Technology of China ; China Postdoctoral Science Foundation ; Doctoral Fund of Ministry of Education of China ; Special Fund for Basic Scientific Research of Central Colleges, Chang'an University, China
PublisherELSEVIER SCIENCE BV
Document Type期刊论文
Identifierhttp://ir.nigpas.ac.cn/handle/332004/10719
Collection中国科学院南京地质古生物研究所
其他
Corresponding AuthorGuo, Junfeng
Affiliation1.Changan Univ, Sch Earth Sci & Resources, Minist Educ, Key Lab Western Mineral Resources & Geol Engn, Xian 710054, Peoples R China
2.Chinese Acad Sci, Nanjing Inst Geol & Palaeobiol, State Key Lab Palaeobiol & Stratig, Nanjing 210008, Jiangsu, Peoples R China
Recommended Citation
GB/T 7714
Guo, Junfeng,Li, Yong,Li, Guoxiang . Small shelly fossils from the early Cambrian Yanjiahe Formation, Yichang, Hubei, China[J]. GONDWANA RESEARCH,2014,25(3):999-1007.
APA Guo, Junfeng,Li, Yong,&Li, Guoxiang .(2014).Small shelly fossils from the early Cambrian Yanjiahe Formation, Yichang, Hubei, China.GONDWANA RESEARCH,25(3),999-1007.
MLA Guo, Junfeng,et al."Small shelly fossils from the early Cambrian Yanjiahe Formation, Yichang, Hubei, China".GONDWANA RESEARCH 25.3(2014):999-1007.
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