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一、前言陕南川北的奥陶系分布于扬子地台北缘边界断裂带(即阳平关—勉县、饶峰、青峰断裂线)的南沿,其西以龙门山深断裂带为界,向东延至城口附近,构造上属扬子准地台中的龙门—大巴台缘褶皱带(任纪舜等1980)的一部分,地层区划上归于米仓山—龙门山分区(赖才根等1982)。该区的奥陶系在赵亚曾、黄汲清、杨敬之、谷德振、候德封、王现珩等人的各类报告中,均已涉及,至今已有50余年的研究历史了。卢衍豪(1943,1959,
I. Preface The Ordovician in north Sichuan and northern Sichuan are distributed along the southern margin of the boundary faults along the northern margin of the Yangtze Platform (ie, Yangpingguan-Mianxian, Rao-Feng and Qingfeng fault lines) Eastward to the vicinity of Chengkou, and is structurally part of the gantry-platform folding belt (Ren Jishun et al., 1980) in the Yangtze Prospective Platform. The stratigraphic division is attributed to the Micangshan-Longmenshan Section (Lai et al. 1982). The Ordovician area has been involved in various reports of Zhao Yazeng, Huang Jiqing, Yang Jingzhi, Gu Dezhen, Hou Defeng and Wang Xianheng for more than 50 years. Lu Yanhao (1943,1959,