Precise Biostratigraphical Correlation and Age of the Leidapo Fossil Assemblages, Early Middle Triassic of Qingyan, Southwestern China
详细信息
- 责任者：Stiller F. (Nanjing Institute of Geology and Palaeontology ; Chinese Academy of Sciences ; Nanjing 210008 ; China) ; Bucher H.
- 刊名：Acta Palaeontologica Sinica
- 出版年：2011
- 卷期：50(1)
- 关键词：安尼阶 ; Anisian ; 菊石目 ; Ammonitida ; 贵州 ; Guizhou Province
- 页码：p.1-12
- 图表：8 illus., 1 table, 34 refs.
- 分类号：1200
- issnNo：ISSN0001-6616
- isbnNo：CN32-1188/Q
摘要
Unusually diverse fossil assemblages from Leidapo near Qingyan, Guizhou Province of Southwest China, provide important information on the main post-extinction radiation of benthic invertebrates and on the evolution of biocoenoses in Early Mesozoic. Precise biostratigraphical correlation and age determination of the strata yielding these fossil assemblages are therefore of great importance. Revised biostratigraphical correlation based on ammonoids shows that the Upper Qingyan Formation of the Qingyan region is of latest middle to earliest Late Anisian age and that the Middle/Late Anisian boundary is situated in the upper middle part of the highly fossiliferous section at Leidapo. The Leidapo fossil assemblages thus span a short time interval, just bracketing the Middle/Late Anisian boundary.