黔北正安安场志留系的几丁虫

LOWER SILURIAN CHITINAZOANS FROM THE ANCHANG SECTION OF ZHENG'AN,NORTHERN GUIZHOU PROVINCE,SOUTHWEST CHINA

通过对黔北正安安场地区下志留统龙马溪组至韩家店组27件样品的化石分析,获取了几丁虫4属14种共348枚,补充了该区几丁虫的属种多样性,自下而上划分为Conochitina edjelensis间隔带和Eisenackitina daozhenensis延限带。在系统地描述了所获几丁虫属种基础上与前人研究所划分的几丁虫带及组成分子进行了对比,更正了Conochitina sacciformis的延限范围,首次在扬子地区发现大量的Eisenackitina causiata。

344 chitinazoans include 14 species are identified from 27 samples in the Lower Silurian of Anchang Section,Zheng＇an,Guizhou Province,southwest China in which supplemented the chitinozoan＇s diversity of this area.Two Chitinozoan biozones,including Conochitina edjelensis Biozone and Eisenackitina daozhenensis Biozone,could be discerned from the lower to the upper.A comparision was made of present study with those of previous ones.We found a large amount of Eisenackitina causiatain the Yangtze Region for the first time.The geological range of Conochitina sacciformis was modified,based on the systematic study of the chitinozoans at the Anchang Section.