Agnostoid biostratigraphy across the Middle-Upper Cambrian boundary in Hunan, China
Peng, SC (彭善池); Robison, RA
2000-07-01
发表期刊JOURNAL OF PALEONTOLOGY
ISSN0022-3360
卷号74期号:4页码:1-104
摘要

Many trilobite species of the order Agnostida have short stratigraphic ranges and global distribution in open-marine deposits. They are most abundant and most diverse from about the middle Middle Cambrian to the middle Upper Cambrian where they are proving to be excellent biostratigraphic indices. We describe unusually rich agnostoid faunas of that age from two thick, well-exposed sections, one near Paibi and one near Wangcun, in northwestern Hunan Province, China. All collections are from the Huaqiao Formation, the definition of which is revised and its stratigraphic content is expanded. Most of the fossils are well preserved in dark, laminated. argillaceous carbonates that were deposited in lower slope environments. These are assigned to 76 species and 33 genera. New species described are Agnostus? babcocki, Ammagnostus? cryptus, Ammagnostus histus, Ammagnostus hunanensis, Ammagnostus wangcunensis, Baltagnostus? ambonus, Linguagnostus stenus, Lisogoragnostus hybus, Lisogoragnostus mictus, and Utagnostus songae. Species reassigned in a new generic combination are Ammagnostus laiwuensis (Lorenz, 1906), Glaberagnostus? cicer (Tullberg, 1880), Kormagnostus minutus (Schrank, 1975), and Pseudophalacroma scanense (Westergard, 1946). The subfamily Ammagnostinae Opik, 1967, is elevated to family rank. The bases of eight agnostoid biozones are defined by the lowest occurrence of a common species having a relatively short stratigraphic range and wide geographic distribution. In ascending order, these zones are named for Ptychagnostus atavus, Ptychagnostus punctuosus, Goniagnostus nathorsti, Lejopyge laevigata, Proagnostus bulbus, Linguagnostus reconditus, Glyptagnostus stolidotus, and Glyptagnostus reticulatus. Each zone is further characterized by an assemblage of agnostoid species that may vary from place to place. By extrapolating from recently published uranium-lead geochronology, we estimate that the average duration of these agnostoid zones was approximately one million years. Formal division of the Cambrian System into global series and stages is a current project of the International Subcommission on Cambrian Stratigraphy. If the base of an upper Cambrian series of whatever name is selected to correlate closely with the traditional Middle-Upper Cambrian boundary in Europe, we propose the base of the Linguagnostus reconditus Zone in the Wangcun section as a potential Global Standard Stratotype-section and Point (GSSP). Alternatively, if the base of an upper Cambrian series is selected to coincide with thr base of the Glyptagnostus reticulatus Zone, we propose the base of that zone in the Paibi section as a potential GSSP.

语种英语
关键词[WOS]North-america ; Trilobites ; Revision ; Argentina ; Sweden
WOS研究方向Paleontology
WOS类目Paleontology
WOS记录号WOS:000087891100001
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/332004/787
专题中国科学院南京地质古生物研究所
其他
通讯作者Peng, SC (彭善池)
作者单位1.Acad Sinica, Nanjing Inst Geol & Palaeontol, Nanjing 210008, Peoples R China
2.Univ Kansas, Dept Geol, Lawrence, KS 66045 USA
推荐引用方式
GB/T 7714
Peng, SC ,Robison, RA. Agnostoid biostratigraphy across the Middle-Upper Cambrian boundary in Hunan, China[J]. JOURNAL OF PALEONTOLOGY,2000,74(4):1-104.
APA Peng, SC ,&Robison, RA.(2000).Agnostoid biostratigraphy across the Middle-Upper Cambrian boundary in Hunan, China.JOURNAL OF PALEONTOLOGY,74(4),1-104.
MLA Peng, SC ,et al."Agnostoid biostratigraphy across the Middle-Upper Cambrian boundary in Hunan, China".JOURNAL OF PALEONTOLOGY 74.4(2000):1-104.
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