KMS Nanjing Institute of Geology and Palaeonotology,CAS
Problematic macrofossils from Ediacaran successions in the North China and Chaidam blocks: Implications for their evolutionary roots and biostratigraphic significance | |
Shen, Bing; Xiao, Shuhai; Dong, Lin; Zhou, Chuanming (周传明); Liu, Jianbo | |
2007-11-01 | |
发表期刊 | JOURNAL OF PALEONTOLOGY |
ISSN | 0022-3360 |
卷号 | 81期号:6页码:1396-1411 |
摘要 | Upper Neoproterozoic successions in the North China and nearby Chaidam blocks are poorly documented. North China successions typically consist of a diamictite unit overlain by siltstone, sandstone, or slate. Similar successions occur in Chaidam, although a cap carbonate lies atop the diamictite unit. The diamictites in both blocks have been variously interpreted as Cryogenian, Ediacaran, or Cambrian glacial deposits. In this paper, we describe problematic macrofossils collected from slate of the upper Zhengmuguan Formation in North China and sandstone of the Zhoujieshan Formation in Chaidam; both fossiliferous formations conformably overlie the aforementioned diamictites. Some of these fossils were previously interpreted as animal traces. Our study recognizes four genera and five species-Helanoichnus helanensis Yang in Yang and Zheng, 1985, Palaeopascichnus minimus n. sp., Palaeopascichnus meuiscatus n. sp., Horodyskia mondiformis? Yochelson and Fedonkin, 2000, and Shaanxilithes cf. ningqiangensis Xing et al., 1984. None of these taxa can be interpreted as animal traces. Instead, they are problematic body fossils of unresolved phylogenetic affinities. The fundamental bodyplan similarity between Horodyskia and Palaeopascichnus, both with serially repeated elements, indicates a possible phylogenetic relationship. Thus, at least some Ediacaran organisms may have a deep root because Horodyskia also occurs in Mesoproterozoic successions. Among the four genera reported here, Palaeopascichnus Palij, 1976 and Shaanxilithes Xing et al., 1984 have been known elsewhere in upper Ediacaran successions, including the Dengying Formation (551-542 Ma) in South China. If these two genera have biostratigraphic significance, the fossiliferous units in North China and Chaidam may be upper Ediacaran as well. Thus, the underlying diamictites in North China and Chaidam cannot be of Cambrian age, although their correlation with Ediacaran and Cryogenian glaciations remains unclear. As no other Neoproterozoic diamictite intervals are known in North China and Chaidam, perhaps only one Neoproterozoic glaciation is recorded in that area. |
语种 | 英语 |
关键词[WOS] | Precambrian-cambrian Boundary ; Bedding-plane Markings ; Trace Fossils ; Western-australia ; Belt Supergroup ; Burgess Shale ; Montana ; Animals ; Cloudina ; Facies |
WOS研究方向 | Paleontology |
WOS类目 | Paleontology |
WOS记录号 | WOS:000250684200016 |
出版者 | PALEONTOLOGICAL SOC INC |
文献类型 | 期刊论文 |
条目标识符 | http://ir.nigpas.ac.cn/handle/332004/66 |
专题 | 中国科学院南京地质古生物研究所 其他 |
通讯作者 | Shen, Bing |
作者单位 | 1.Virginia Polytech Inst & State Univ, Dept Geosci, Blacksburg, VA 24061 USA 2.Chinese Acad Sci, Nanjing Inst Geol & Paleontol, Lab Paleobiol & Stratig, Nanjing 210008, Peoples R China 3.Peking Univ, Dept Earth & Planetary Sci, Beijing 100871, Peoples R China |
推荐引用方式 GB/T 7714 | Shen, Bing,Xiao, Shuhai,Dong, Lin,et al. Problematic macrofossils from Ediacaran successions in the North China and Chaidam blocks: Implications for their evolutionary roots and biostratigraphic significance[J]. JOURNAL OF PALEONTOLOGY,2007,81(6):1396-1411. |
APA | Shen, Bing,Xiao, Shuhai,Dong, Lin,Zhou, Chuanming ,&Liu, Jianbo.(2007).Problematic macrofossils from Ediacaran successions in the North China and Chaidam blocks: Implications for their evolutionary roots and biostratigraphic significance.JOURNAL OF PALEONTOLOGY,81(6),1396-1411. |
MLA | Shen, Bing,et al."Problematic macrofossils from Ediacaran successions in the North China and Chaidam blocks: Implications for their evolutionary roots and biostratigraphic significance".JOURNAL OF PALEONTOLOGY 81.6(2007):1396-1411. |
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