摘要
寒武系芙蓉统和排碧阶全球层型剖面——湖南花垣排碧剖面底界界线层的牙形刺生物地层,由下至上划分为Westergaardodina tetragonia带、Westergaardodina matsushitai带和Westergaardodina bicuspidate 3个牙形刺带,可与该界线层的三叶虫带进行很好对比;同时讨论了芙蓉统和排碧阶底界划在牙形刺Westergaardodina mat-sushitai带和Westergaardodina bicuspidata带之间的合理性;此外,还将该牙形刺分带与华北和东北地区寒武系牙形刺带进行了对比。
Cambrian slope deposits are well exposed in western Hunan.The worldwide known sediments
mainly consist of limestones bearing rich trilobite and conodont faunas.The trilobite biostratigraphy of the
area is well studied,and now the first GSSP inside the Cambrian System has been ratified by IUGS and
will be erected in this region.The Paibi section,Huayuan County,northwestern Hunan Province has been
accepted for the GSSP of the base of the Furongian Series and Paibian Stage(Peng Shan-chi et al.,
2004a).
However,the conodont biostratigraphy of the boundary interval of the base of Furongian Series and
Paibian Stage was relatively less investigated,because most of the existing papers on Cambrian conodont
of this region focused on the traditional Middle-Upper Cambrian boundary interval,corresponding to the
FAD of Linguagnostus reconditus(Dong Xi-ping,1990,1993,1999;Dong Xi-ping&Bergstrom.2001),
whereas now the FAD of Glyptagnostus reticulatus has been selected for the GSP of the base of Furongian
Series(which is the uppermost Series in Cambrian)and Paibian Stage.Thus,more attention should be
paid on the conodont biostratigraphy in the boundary interval bearing Glyptagnostus reticulatus.In October
2001,the present authors and the others carried out a systematic and continuous sampling in the boundary
beds of the base of Furongian Series and Paibian Stage of the Paibi section.Nearly 1 000 kg of limestone,
representing 196 conodont sampler from the boundary beds of the section were processed,and relatively
abundant paraconodont and protoconodont specimens were found and carefully studied in this paper.
Based on the stratigraphical ranges of conodont species of the genus Westergaardodina the boundary
interval of the base of Furongian Series and Paibian stage in the Paibi section can be subdivided into three
conodont biozones(Fig.1 and Table 1),which are
出处
《地层学杂志》
CSCD
北大核心
2004年第2期114-119,共6页
Journal of Stratigraphy
基金
国家自然科学基金(No.40272003
40072003)和国家自然科学基金重点项目(No.40332018)联合资助
关键词
牙形刺生物地层
芙蓉统
排碧阶
层型剖面
conodont biostratigraphy
Westergaardodina
Furongian Series
Paibian Stage
GSSP
Hunan
