Discussion on the Age of the Xiangshan Group
详细信息
- 责任者：Zhou Zhiqiang (Xi’an Institute of Geology and Mineral Resources ; Xi’an 710054 ; China) ; Xiao Peixi
- 刊名：Northwestern Geology
- 出版年：2010
- 卷期：43(1)
- 关键词：早古生代 ; Lower Palaeozoic ; 宁夏 ; Ningxia
- 页码：p.54-59
- 图表：1 illus., 12 refs.
- 分类号：1200
- issnNo：ISSN1009-6248
- isbnNo：CN61-1149/P
摘要
The Xiangshan Group distributed in the middle part of the Ningxia has been divided into four unnamed subgroups. The occurrence of the trilobites Holocephalites punctatus Zhou, Olenoides ningxiacus Zhou, Peronopsis ovalis Zhou and conodonts Furnishina asymmetrica Müller, F. furnishi Müller from the thin-bedded limestone in its first subgroup suggests that the first subgroup of the Xiangshan Group ranges in age from the Middle to Late Cambrian. The conodonts Cordylodus proavus Müller and Oistodiform element recorded from the upper part of its second subgroup suggests that the subgroup is most likely of Late Cambrian to Early Ordovician.