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The Discussion on Stratigraphic Division of Devonian in Guizhou

Zhou Xiyun (No. 05 Project Administration, Ministry of Geology and Mineral Resources)  
According to the new data of the Devonian stratigraphy in Guizhou, the boundary of the Lower and Middle Devonian is located probably between the Guanziyao and Huo-hong Formations in Puan region. The Longdongshui Formation maybe belong to the Lower Devonian, and the boundary of the Lower and Middle Devonian is proximally between the Longdongshui Formation and Dahekou Formation in Dushan region. The first appearance of the Stringocephalus is considered as internal boundary of the Middle Devonian which is corresponded roughly to the boundary of the Eifelian and Givetian Stages in Europe. This boundary is between the Tengshang and Jipao Members of the Dushan Formation. Based on the palaeospore data, the lower part of the Yeshan Group (or Yeshan Sandstone) as properly named by Professor Yue Senxin (1957) belongs to the Lower Devonian in Kaili region.
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