Acritarchs from the Early-Middle Cambrian Kaili Formation in the Wuliu-Zengjiaya Section, East Guizhou Province, China

• 责任者：Yin Leiming (Nanjing Institute of Geology and Palaeontology ; Chinese Academy of Sciences ; Nanjing 210008 ; China) ; Zhao Yuanlong
• 刊名：Acta Palaeontologica Sinica
• 出版年：2010
• 卷期：49(2)
• 关键词：疑源类 ; acritarchs ; 贵州 ; Guizhou Province
• 页码：p.164-173
• 图表：5 illus., 19 refs.
• 分类号：1101
• issnNo：ISSN0001-6616
• isbnNo：CN32-1188/Q

As a proposed GSSP for Stage 5（“Middle Cambrian”  boundary）, the Wuliu-Zengjiaya section of the Kaili Formation, China, has yielded well-preserved macroinvertebrate fossils, especially trilobites. A more detailed study of acritarch biostratigraphy of the section is therefore necessary to provide an accurate record of biotic and environmental changes at the boundary. Acritarchs of the Kaili Formation in the Wuliu-Zengjiaya section can be recognized as two distinct assemblages: the Leiomarginata simplex-Fimbriaglomerella membranacea assemblage; and the Cristallinium cambriense-Heliosphaeridium nodosum-Globosphaeridium cerinum assemblage. From 140 to 214 m, only a few acritarch specimens have been found. This is probably because the limestones that dominate the upper part of the Kaili Formation are not suitable for preserving organic-walled microfossils.