New data regarding acritarch biostratigraphy from the Early-Middle Cambrian Kaili Formation in Chuandong,Guizhou Province,China  

作　　者：Leiming Yin Ruidong Yang Jin Peng Fanfan Kong 

机构地区：[1]Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China [2]College of Resource and Environment of Guizhou University, Guiyang 550003, China [3]Department of Sciences of Nanjing University, Nanjing 210093, China

出　　处：《Progress in Natural Science:Materials International》2009年第1期107-114,共8页自然科学进展·国际材料（英文版）

基　　金：supported by National Natural Science Foundation of China (Grant No.40672018);the Ministry of Technology and Science of China (2002.CCC02600,2006CB806401);the Foundation of the Mobile Project of Science and Technology of Guizhou Province (Grant No.Gui Ji.2007-4004);the Foundation of the Governor of Guizhou Province (Gui E.2006-7);the Key Project of International Cooperation of Guizhou Science and Technology (G.[2008] 700110)

摘　　要：Previous studies had evaluated acritarchs from the Balang and Pingzhai sections of the Early-Middle Cambrian Kaili Formation in east Guizhou, China. The results of these studies suggest that the acritarchs in these sections have potential biostratigraphic significance. More recently, 34 samples collected from 83 m lower part of the Lower-Middle Cambrian Kaili Formation in the Jianshan section of Chuandong, Guizhou Province were prepared for palynological analysis. Analysis of these samples revealed a distinct change in the acritarch assemblages at the bed, which was approximately 46 m above the bottom of the Kaili Formation. These findings suggest a boundary represented by an important alteration of the ecological environment. In addition, the position of the acritarch biostratigraphic change is somewhat higher than the boundary between Cambrian Series 2 and Series 3 based on trilobites found in the same section. This indicates that the distinct change in acritarch assemblages is similar to the change in trilobite assemblages that occurs around the boundary between Cambrian Series 2 and Series 3. Therefore, acritarch biostratigraphy can provide data that can be used to define the base of Cambrian Series 3 in this region, and oossiblv worldwide.Previous studies had evaluated acritarchs from the Balang and Pingzhai sections of the Early-Middle Cambrian Kaili Formation in east Guizhou,China.The results of these studies suggest that the acritarchs in these sections have potential biostratigraphic significance.More recently,34 samples collected from 83 m lower part of the Lower-Middle Cambrian Kaili Formation in the Jianshan section of Chuandong,Guizhou Province were prepared for palynological analysis.Analysis of these samples revealed a distinct change in the acritarch assemblages at the bed,which was approximately 46 m above the bottom of the Kaili Formation.These findings suggest a boundary represented by an important alteration of the ecological environment.In addition,the position of the acritarch biostratigraphic change is somewhat higher than the boundary between Cambrian Series 2 and Series 3 based on trilobites found in the same section.This indicates that the distinct change in acritarch assemblages is similar to the change in trilobite assemblages that occurs around the boundary between Cambrian Series 2 and Series 3.Therefore,acritarch biostratigraphy can provide data that can be used to define the base of Cambrian Series 3 in this region,and possibly worldwide.

关 键 词：ACRITARCHS Lower-Middle Cambrian Kaili Formation Jianshan section Chuandong 

分 类 号：P534.41[天文地球—古生物学与地层学]