- 责任者：Xie Congrui (Key Laboratory for the Study of Focused Magmatism and Giant Ore Deposits ; MLR ; Xi’an Center of Geological Survey ; CGS ; Xi’an 710054 ; China) ; Xiao Peixi
- 刊名：Journal of Stratigraphy
- 出版年：2013
- 卷期：37(1)
- 关键词：寒武纪 ; Cambrian ; 早奥陶世 ; Lower Ordovician ; 岩石地层单位 ; lithostratigraphic units ; 甘肃 ; Gansu Province
- 页码：p.54-57
- 图表：illus., 1 table, 12 refs.
- 分类号：1200
- issnNo：ISSN0253-4959
- isbnNo：CN32-1187/P
The Hanmushan Group in the Longshou Mountains in Gansu Province includes the Shaohuotonggou Formation and the overlying Caodaban Formation. The age of the Caodaban Formation has been in dispute. Some geologists regard it as Cambrian in age, whereas others place it in the Cryogenian-Ediacaran because of the presence of glacial diamictite in the lower Caodaban Formation. In our recent geological survey, we have found Calathium（？）, crinoids, and poriferan fossils in the Caodaban Formation of the Hanmushan Group at the Heigou section in Jinchuan, Gansu Province. Thus, the Caodaban Formation is likely of Cambrian to early Ordovician in age. The underlying glacial diamictite of the Shaohuotonggou Formation can be correlated with the Zhengmuguan Formation in the Helanshan Mountains.