A new section of Kaili Formation (Cambrian) and a biostratigraphic study of the boundary i

A new section of Kaili Formation (Cambrian) and a biostratigraphic study of the boundary interval across the undefined Cambrian Series 2 and Series

3 at Jianshan, Jianhe County,China with a discussion of global correlation based on the first

appearance datum of Oryctocephalus

indicus(Reed,1910)

Yuanlong Zhao;Yuxian Wang;Jinliang Yuan;Shanchi Peng;Loren E. Babcock;Jin Peng;Qingjun Guo;Jihpai Lin;Tongshu Tai;Ruidong Yang

【期刊名称】《自然科学进展（英文版）》 【年(卷),期】2008(018)012

【摘要】A trilobite biostratigraphic study of a new section of the Kaili Formation at Jianshan,Chuandong Village,Jianhe County,Guizhou is reported.Additional occurrences of key species associated with the Ovatoryctocara granulata-Bathynotus holopygus Zone and the overlying Oryctocephalus indicus Zone that were originally defined from the trilobite assemblages at the Wuliu-Zengjiayan section of the Kaili are reported from this new section.The first appearance datum (FAD) of Oryctocephalus indicus occurs at the 44.52 m above the base of the unit.Based on study of abundant specimens (n = 800) from the Kaili Formation,we argue that Oryctocephalus indicus is a widespread taxon with a global distribution.O.Reticulatus (Lermontova,1940) from