Conodont Biostratigraphy of the Middle Cambrian through Lowermost Ordovician in Hunan, South China

Conodont Biostratigraphy of the Middle Cambrian through Lowermost Ordovician in Hunan, South

China

DONG Xiping;John E. REPETSKI;Stig M. BERGSTR(O)M

【期刊名称】《地质学报（英文版）》 【年(卷),期】2004(078)006

【摘要】Since 1985, samples with a total weight of more than 14,000 kg, mainly from three key sections in western and northwestern Hunan, South China, have been processed for conodonts. In strata older than the late Late Cambrian paraconodonts have proved useful for stratigraphic subdivision and correlation. Thirteen conodont zones are proposed in the Middle Cambrian through lowermost Ordovician. The correlation between these zones and those of North China, western U.S.A., western Newfoundland, Canada, and Iran is discussed. In ascending order, these 13 zones are as follows: The Gapparodus bisulcatus-Westergaardodina brevidens Zone, Shandongodus priscus-Hunanognathus tricuspidatus Zone,Westergaardodina quadrata Zone, Westergaardodina matsushitai-W. grandidens Zone, Westergaardodina lui-W. ani Zone,Westergaardodina cf. calix-Prooneotodus rotundatus Zone,

Proconodontus

tenuiserratus

Zone,

Proconodontus

Zone,Eoconodontus Zone, Cordylodus proavus Zone, Cordylodus intermedius Zone, Cordylodus lindstromi Zone, and Cordylodus