Brief Introduction of Selected Works on Graptolites by Xu Jie
许杰笔石论文集简介

Some of our views on the correlation of graptolite and some shelly fossil sequence from the latest Ordovician to earliest Si'urian and on the division of the Ordovician-Silurian boundary have been presented in the past papers (Wang et al., 1980, 1983a, b; Lai et al., 1982; Xu et al., 1983). The present paper will further inquire into these problems in the light of biostratigraphy, isotope age dating sedimenatry facies and priliminary paleomagnetic research from the Ordovician-Silurian boundary sections of the eastern Yangzi (Yangtze) Gorges (pl. 1-2).