FU Lipu, ZHANG Zifu, XIE Congrui. 2004: Cyrtograptid zones near the lower boundary of the Silurian Wenlock Series in Ziyang,Shaanxi. Geological Bulletin of China, 23(8): 795-798.
Citation:
FU Lipu, ZHANG Zifu, XIE Congrui. 2004: Cyrtograptid zones near the lower boundary of the Silurian Wenlock Series in Ziyang,Shaanxi. Geological Bulletin of China, 23(8): 795-798.
FU Lipu, ZHANG Zifu, XIE Congrui. 2004: Cyrtograptid zones near the lower boundary of the Silurian Wenlock Series in Ziyang,Shaanxi. Geological Bulletin of China, 23(8): 795-798.
Citation:
FU Lipu, ZHANG Zifu, XIE Congrui. 2004: Cyrtograptid zones near the lower boundary of the Silurian Wenlock Series in Ziyang,Shaanxi. Geological Bulletin of China, 23(8): 795-798.
Cyrtograptid zones near the lower boundary of the Silurian Wenlock Series in Ziyang,Shaanxi
According to the characteristics and horizons of 6species of Cyrtograptus collected recently near the lower boundary of the Wenlock at the Xianzhonggoukou section,Bajiaokou,Ziyang,Shaanxi ,five continuous cyrtograptid zones are recognized;they are the Cyr
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