华南上扬子区早、中奥陶世几丁虫生物地层

EARLY-MIDDLE ORDOVICIAN CHITINOZOAN BIOSTRATIGRAPHY OF THE UPPER YANGTZE REGION,SOUTH CHINA

研究了华南上扬子区5条出露完好的下、中奥陶统剖面的生物地层,识别出了研究区下奥陶统至上奥陶统底部8个几丁虫带及2个几丁虫亚带,由下至上分别是Lagenochitina pestovoensis带,Euconochitina symmetrica带,未命名带1,Desmochitina maotaiensis带,Sagenachitina dapingensis带,Lagenochitina esthonica elongate带,未命名带2,Laufeldochitina stentor带,Cyathochitinasp.3亚带及Armoricochitina granulifera亚带。这些化石带与区内同期笔石带、牙形类带以及区外主要块体同期几丁虫带可以进行对比。

Lithostratigraphy and sections have been investigated. chitinozoan biostratigraphy of five well-exposed Lower-Middle Ordovician Eight chitinozoan biozones and two subzones are recognized and discussed in detail, including ascendingly the Lagenochitina pestovoensis Biozone, the Euconochitina symmetrica Biozone, th Unnamed Biozone 1, the Desmochitina maotaiensis Biozone, the Sagenachitina dapingensis Biozone, the Lagenochitina esthonica elongata Biozone, Unnamed Biozone 2, the Laufeldochitina stentor Biozone, the Cyathochitina sp. 3 Subzone and the Armoricochitina granulifera Subzone. Correlation of these chitinozoan biozones with the coeval graptolitic and conodont biozones from the Upper Yangtze Re- gion as well as the chitinozoan biozones of other major paleoplates has been investigated to reveal their bio- stratigraphic implications.