Restudy and Definition of the
详细信息
- 责任者：Tang Peng (State Key Laboratory of Palaeobiology and Stratigraphy ; Nanjing 210008) ; Huang Bing
- 刊名：Journal of Stratigraphy
- 出版年：2010
- 卷期：34(3)
- 关键词：志留纪 ; Silurian ; 四川 ; Sichuan Province
- 页码：p.241-253
- 图表：6 illus., 2 tables, 60 refs.
- 分类号：1200
- issnNo：ISSN0253-4959
- isbnNo：CN32-1187/P
摘要
The Late Silurian stratigraphy of the Guangyuan area,northern Sichuan Province,was subdivided into three formations including,in ascending order,the Jintaiguan Fm.,Chejiaba Fm. and Zhongjianliang Fm. On the basis new lithostratigraphic and biostratigraphic data,these three formations are combined into the Chejiaba Fm. The Chejiaba Fm.,consisting of sandstone and mudstone with near shore marine red beds,intercalated occasionally with calcareous sandstone and limestone lenses in the middle and upper parts; thin-bedded argillaceous sandstone and silt mudstone in the upper,represents a sea-level rise sequence. The conodont Ozarkodina crispa previously reported from the Chejiaba Fm. is be re-identified as Ozarkodina snajdri,which represent this first report of this species in Silurian of China. The age of the Chejiaba Fm. is re-determined as late mid-Ludlow to early late-Ludlow,which is earlier than the Kuanti Fm. of Eastern Yunnan Province. The chitinozoan assemblage of Sphaerochitina sp. is found in the Chejiaba Fm. and is correlated with the O. snajdri conodont zone and the bohemicus tenus-kozlowskii graptolite zone.