Occurrence of the earliest known Sphenothallus Hall in the Lower Cambrian of Southern Shaanxi Province, China

doi:10.1016/j.geobios.2003.04.002

	Occurrence of the earliest known Sphenothallus Hall in the Lower Cambrian of Southern Shaanxi Province, China
	Li, GX (李国祥); Zhu, MY (朱茂炎); Van Iten, H ; Li, CW
	2004-03-01
发表期刊	GEOBIOS
ISSN	0016-6995
卷号	37 期号:2 页码:229-237
摘要	Three-dimensionally preserved specimens of an indeterminate species of Sphenothallus Hall occur in limestones in the uppermost Guojiaba and lower Xiannudong formations (Qiongzhusian and early Canglangpuan stages, Lower Cambrian) in southern Shaanxi Province, China. The specimens consist of a small (up to 3 mm long), gradually tapered, subcircular to elliptic (transversely) tube that is broken at both ends, commonly with the fracture edge at the wide (apertural) end of each face forming a V- or U-shaped notch. Some specimens preserve the subconical upper (proximal) part of the holdfast, and all specimens are black. Combined scanning and transmission electron microscopy and energy dispersive elemental analyses show that the tube wall is finely laminated, with individual laminae measuring about 1 mum thick, and consists mainly of calcium phosphate but also contains organic material. Sphenothallus specimens from the Lower Cambrian Guojiaba and Xiannudong formations represent the earliest known record of this genus, and indicate that the origin of this taxon is coeval with and possibly related to the Early Cambrian bioradiation event. (C) 2004 Elsevier SAS. All rights reserved.
关键词	Sphenothallus Lower Cambrian Qiongzhusian Stage Southern Shaanxi
DOI	10.1016/j.geobios.2003.04.002
语种	英语
关键词[WOS]	Upper Ordovician ; Vermes ; Middle
WOS研究方向	Paleontology
WOS类目	Paleontology
WOS记录号	WOS:000221056000009
出版者	EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
文献类型	期刊论文
条目标识符	http://ir.nigpas.ac.cn/handle/332004/1043
专题	中国科学院南京地质古生物研究所其他
通讯作者	Li, GX (李国祥)
作者单位	1.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, Nanjing 210008, Peoples R China 2.Hanover Coll, Dept Geol, Hanover, IN 47243 USA 3.Natl Tsing Hua Univ, Inst Life Sci, Tsingzhu, Taiwan
推荐引用方式 GB/T 7714	Li, GX ,Zhu, MY ,Van Iten, H,et al. Occurrence of the earliest known Sphenothallus Hall in the Lower Cambrian of Southern Shaanxi Province, China[J]. GEOBIOS,2004,37(2):229-237.
APA	Li, GX ,Zhu, MY ,Van Iten, H,&Li, CW.(2004).Occurrence of the earliest known Sphenothallus Hall in the Lower Cambrian of Southern Shaanxi Province, China.GEOBIOS,37(2),229-237.
MLA	Li, GX ,et al."Occurrence of the earliest known Sphenothallus Hall in the Lower Cambrian of Southern Shaanxi Province, China".GEOBIOS 37.2(2004):229-237.