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On the Chaomidian Formation of the Jiulong Group in Shandong Province
详细信息   
摘要

    

In recent years, in Zhangxia-Gushan area of Changqing district, Yaowangshan Mountains region in Qingzhou County, and the Huangyangshan area in Laiwu City, the Cambrian-Ordovician boundary has been determined biostratigraphically, using the conodont fossil “Cordylodus lindstromi”, to be within the Chaomidian Formation, respectively at 9.05 m, 58.10 m, and 4.00 m below the top of the Chaomidian Formation. Thus, the Chaomidian Formation should be regarded as a lithostratigraphic unit that crosses the Cambrian-Ordovician boundary.

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